Abstract
The hydrogeochemical study of surface water in Pratapgarh district has been carried out to assess the major ion chemistry and water quality for drinking and domestic purposes. For this purpose, twenty-five surface water samples were collected from river, ponds and canals and analysed for pH, electrical conductivity, total dissolved solids (TDS), turbidity, hardness, major cations (Ca2+, Mg2+, Na+ and K+), major anions (HCO3 −, F−, Cl−, NO3 −, SO4 2−) and dissolved silica concentration. The analytical results show mildly acidic to alkaline nature of surface water resources of Pratapgarh district. HCO3 − and Cl− are the dominant anions, while cation chemistry is dominated by Na+ and Ca2+. The statistical analysis and data plotted on the Piper diagram reveals that the surface water chemistry is mainly controlled by rock weathering with secondary contributions from agriculture and anthropogenic sources. Ca2+–Mg2+–HCO3 −, Ca2+–Mg2+–Cl− and Na+–HCO3 −–Cl− are the dominant hydrogeochemical facies in the surface water of the area. For quality assessment, values of analysed parameters were compared with Indian and WHO water quality standards, which shows that the concentrations of TDS, F−, NO3 −, Na+, Mg2+ and total hardness are exceeding the desirable limits in some water samples. Water Quality Index (WQI) is one of the most effective tools to communicate information on the quality of any water body. The computed WQI values of Pratapgarh district surface water range from 28 to 198 with an average value of 82, and more than half of the study area is under excellent to good category.
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Introduction
The availability of fresh water is potentially one of the most pervasive crises of the coming century. Water-related decisions will determine the future of major ecosystems, health of regional economies and political stability of the nations. Water quality plays an important role in promoting agricultural production and standard of human health. Water quality is much depending on the desired use of water, hence different uses require different criteria of water quality assessment as well as standard method for reporting and comparing result of water analysis (Babiker et al. 2007). Therefore, understanding of the chemical composition of water is essential for evaluating its suitability for different purposes. Further, it is possible to understand the change in quality due to water–rock interaction (weathering) or any type of anthropogenic influences (Todd 1980). In the last few decades, due to rapid industrialization and increase in human population, there has been a tremendous pressure on the demand of fresh water (Singh et al. 2014; Chandra et al. 2014). Water pollution not only affects water quality but also threats human health, economic development and social prosperity (Milovanovic 2007). A large population in India still live in absolute poverty in both urban and rural areas, lacking access to clean drinking water and basic sanitation. Access to safe drinking water remains an urgent necessity, as 30 % of urban and 90 % of rural Indian population still depend completely on untreated surface or groundwater resources (Kumar et al. 2005).
Water Quality Index (WQI), a well-known method for assessing water quality offers a simple, stable and reproducible unit of measurement and communicates information of water quality to the policy makers and concerned citizens (Singh et al. 2013a). Statistical methods help to explain the correlation among large number of populations and also to reduce the number of variables into small number of factors without the loss of essential information (Nadiri et al. 2013). WOI and statistical methods are very useful and efficient for assessing the quality of water and for communicating the information on overall quality of water (Srivastava et al. 2011; Yadav et al. 2012; Verma and Singh 2013; Ravikumar et al. 2013; Kumar et al. 2014; Tiwari et al. 2014; Parmar and Bhardwaj 2014; Singh and Kamal 2014; Krishna Kumar et al. 2014; Singh et al. 2015a; Yadav et al. 2015; Nasri et al. 2015; Singh et al. 2015b; Okiongbo and Douglas 2015; Tiwari et al. 2015; Singh et al. 2015c).
Geographical information system (GIS) is a powerful tool for developing solutions for water resource problems, assessing water quality, determining water availability, zone mapping and risk assessment on environmental health problems on a local to regional scale (Tjandra et al. 2003; Ghosh et al. 2015). GIS is widely used for collecting diverse spatial data and for overlay analysis in spatial register domain to represent spatially variable phenomena (Bonham-Carter 1996; Gupta and Srivastava 2010). GIS-based, simple and robust WQI is an essential tool for rapid transfer of information to water resources managers and public and useful for taking quick policy decisions (Srivastava et al. 2011; Singh et al. 2013b; Tiwari et al. 2014). Recently, several studies have been made on the use of GIS and preparing spatial distribution map of water quality parameters (Chatterjee et al. 2010; Srivastava et al. 2011; Srinivas et al. 2013; Singh et al. 2013c; Selvam et al. 2013; Tiwari and Singh 2014; Gnanachandrasamy et al. 2014; Tiwari et al. 2014). In the present work, attempts have been made to evaluate the water quality of surface water resources in Pratapgarh district by using conventional hydrogeochemical methods, WQI and preparing thematic maps for the various water quality parameters. The study provides baseline information about water quality for the welfare of the society and that may also help in future water resource planning for the area.
Study area
Pratapgarh is one of the oldest district of Uttar Pradesh, lies between 25°34′ and 26°11′N latitudes, and 81°19′ and 82°27′E longitudes and covers total geographical area of 3730 km2 (Fig. 1). Pratapgarh district has seventeen administrative blocks and total population of the district is around 3,173,752 (India Census, 2011). The study area has a semi-arid to arid climate characterized by a hot summer and cold winter. January is the coldest month of the year with the mean daily maximum and minimum temperature of 24.1 and 7.5 °C, respectively. May is the hottest months with mean daily maximum temperature of 42.5 °C and minimum of 26.4 °C. The average annual rainfall of the district is around 1000 mm and about 90 % of the rainfall takes place during June to September months. Agriculture is the main activity carried out in this area.
Sai is the most important river flowing from west to east direction through heartland of the Pratapgarh district. This river irrigates northern and southern parts of Pratapgarh district and meets Gomti River at downstream in the Jaunpur district. During rainy season, Sai River often gets flooded and during summer, narrow strip of water flows through masses of sand. The average altitude of the district is 137 metre from mean sea level and the land slopes gently from north-west to south-east. Pratapgarh district has no exploitable minerals except sands excavation along the rivers Ganga and Sai.
Geologically, the whole district is covered with unconsolidated Quaternary alluvium deposits. The formations are chiefly composed of sand, sandy clay, clay with varying amount of kankar (calcareous nodules). The older alluvium generally occupies a larger part of the area away from flood plains of the Ganga and Sai Rivers, whereas newer alluvium generally occupies the low-lying areas and is restricted to flood plains mainly in the narrow belt along the course of rivers. The older alluvium is made up of massive beds of clay of pale reddish brown colour, very often yellowish with kankar (calcrete) present in between the clay layers. The newer alluvium is light coloured and poor in calcareous matter. The upper layer of alluvium is composed of sandy loam and clayey loam.
Materials and methods
For the assessment of surface water quality of Pratapgarh district, a systematic sampling was carried out during June 2009. Representative twenty-five surface water samples were collected from river, ponds and canals both in rural and urban area (Fig. 1 and Table 1). Surface water samples were collected in pre-washed one-litre polyethylene narrow-mouth bottles after rinsing the bottles for 2–3 times with water to be sampled. pH and electrical conductivity (EC) values were measured in the field using a portable conductivity and pH metre. In the laboratory, the water samples were filtered through 0.45-µm Millipore membrane filters to separate suspended sediments. Acid titration and molybdosilicate methods were used to determine the concentration of bicarbonate and dissolved silica, respectively, in surface water (APHA 1998). Concentration of major anions (F−, Cl−, NO3 − and SO4 2−) were determined by ion chromatograph (Dionex DX-120) using anion (AS12A/AG12) columns coupled to an self-regenerating suppressor (ASRS) in recycle mode. Concentration of major cations (Ca2+, Mg2+, Na+ and K+) were determined by flame atomic absorption spectrophotometer (VARIAN-AA280 FS). Three replicates were run for each sample for cation analysis and the instrument was recalibrated after every 15 samples. An overall precision, expressed as percent relative standard deviation (RSD), was obtained below 10 % for the entire samples. The thematic maps of water quality parameters were prepared by using ARC GIS-10.2 software.
The SPSS (version 20), a commercial statistical software package was used for computing inter-elemental correlations and principal component analysis of the database. A correlation coefficient is a commonly used measure to establish the relationship between two variables. It is simply a measure to exhibit how well one variable predicts the other. Factor analysis is a useful explanatory tool in multivariate statistical analysis, and it can be applied to discover and interpret relations among variables or to test hypotheses (Ballukraya and Ravi 1999). The common principle of the factor analysis is to find an approach of condensing the information contained in a number of original variables into a smaller set of new composite dimensions with a minimum loss of information. R-mode factor analysis was carried out with the help of SPSS software to extract the factors governing the surface water chemistry of the present study area.
Results and discussion
The physico-chemical parameters of the analysed surface water samples of the Pratapgarh district including statistical measures such as minimum, maximum, average values and standard deviation are given in Table 2.
pH, EC and TDS
pH is a measurement of the intensity of acidity or alkalinity and the concentration of H+ ions in water. pH of the analysed water samples varied from 6.8 to 9.8 and the average pH was found to be 8.0, indicating mildly acidic to alkaline nature of the surface water samples. EC denotes the conducting capacity of water, which in turn is determined by the presence of dissolved ions. EC is a measure of total dissolved solids (TDS) i.e.—it depends upon the ionic strength of the solution. Increase in the concentration of dissolved solids, increases the ionic strength of the solution. The measured EC of the surface water in the study area varies from 234 to 3270 µS cm−1 with an average value of 869 µS cm−1. Concentration of TDS in the surface water of the study area ranged from 203 to 2044 mg L−1 with an average value of 669 mg L−1. Water can be classified into fresh (TDS < 1000 mg L−1), brackish (>1000 mg L−1), saline (>10,000 mg L−1) and brine (100,000 mg L−1) categories on the basis of TDS concentration (Freeze and Cherry 1979). Based on this classification, 80 % of the surface water of the study area belongs to fresh water and remaining 20 % to brackish water categories. The higher standard deviations for EC (±637) and TDS (±478) values reflect wide variation in the ionic concentration in the surface water of the area. The spatial variation shows higher TDS values at sites 10, 12, 13, 14 and 23 (Fig. 2). The large spatial differences between the values of TDS could be attributed to the variation in geochemical processes and anthropogenic activities in the region. EC, TDS and ionic concentration of dissolved species are relatively higher in pond water compared to canal and river water.
Major ion chemistry
Bicarbonate, chloride, sodium and calcium are the dominant dissolved ions in the Pratapgarh surface water, constituting 51, 17, 12 and 6 % of the TDS, respectively, along with secondary contributions from sulphate (5 %) and magnesium (5 %). Nitrate, potassium and fluoride have very little contribution to the solute load, together account for <4 % of the TDS. The anion chemistry of surface water is dominant by HCO3 − and Cl− with secondary contribution of SO4 2− (Fig. 3a). Nitrate and fluoride are the less dominant anions. The orders of anions abundance in the surface water were found as HCO3 − > Cl− > SO4 2− > NO3 − > F−. The concentration of bicarbonate varied from a minimum 68 mg L−1 to a maximum value of 1290 mg L−1 with an average value of 320 mg L−1. Bicarbonate is mainly derived from the soil zone by CO2 dissolution of carbonates and silicates. The soil in the subsurface environment contains elevated CO2 concentration (produced due to the decay of organic matter and root respiration), which in turn combines with rainwater to form bicarbonic acid that produces bicarbonate. The cation ternary diagram relating Ca2+, Mg2+ and Na+, K+ indicates that the Pratapgarh surface water is dominated by sodium and calcium (Fig. 3b). Magnesium and potassium were the least dominant cations. The order of cation abundance is Na+ > Ca2+ > Mg2+ > K+ in the surface water of the area.
Hydrogeochemical facies of surface water
The Piper (1944) diagram is very useful in determining relationships of different dissolved constituents and classification of water on the basis of its chemical characters. The triangular cationic field of Piper diagram reveals that 48 % of the surface water samples fall into (Na + K) dominant class and 40 % into no dominance class, whereas in anionic triangle, majority of the samples (84 %) fall into bicarbonate field. About 8 % of the surface water samples fall into chloride field and 8 % into no dominant field of anion triangle (Fig. 4). The plot of chemical data on diamond-shaped central field, which relates the cation and anion triangles reveals that plotted points fall in the 1, 2, 3, 4, 5, 7 and 9 fields. In majority of the surface water samples, alkaline earth metals (Ca2+ + Mg2+) exceed alkali metal cations (Na+ + K+) and plotted points fall in the field 1. About 84 % surface water samples exhibit dominance of HCO3 − over (SO4 2− + Cl−) and plotted points fall in the field 3. The plotted points of 60 % surface water samples fall in the field 5 suggesting carbonate hardness, while one sample (4 %) in the field 6 and two samples (8 %) in the field 7, indicate non-carbonate hardness. About 24 % surface water samples fall in the field 9, which indicate an intermediate chemical character of surface water having none of the cation–anion pairs dominants in the chemical composition. Ca2+–Mg2+–HCO3 − is the dominant hydrogeochemical facies in 60 % of the surface water samples, while 24 % surface water samples occur as a mixed chemical character of Ca2+–Mg2+–Cl− and Na+–HCO3 −–Cl− hydrogeochemical facies.
Statistical analysis
Statistical analysis is an important tool used to process large amounts of data and report overall trends. This analysis attempts to establish the nature of the relationship between the water quality parameters and WQI. The computed correlation matrix of the 16 measured parameters is given in Table 3. EC and TDS show high positive correlation with Na+, K+, Cl− and HCO3 – and moderate correlation with Ca2+, Mg2+, SO4 2− and total hardness (TH). There is good correlation between Ca2+ and Mg2+ (0.88), Na+ and K+ (0.74) and moderate correlation of HCO3 −–Na+ (0.48). Good correlations were also observed between Ca2+–Cl− (0.82), Mg2+–Cl− (0.85), Ca2+–TH (0.90) and Mg2+–TH (0.95), indicating similar source and/or geochemical behaviour during various processes. The positive correlation between Cl− and Na+ (0.62), Cl− and TDS (0.57) and Na+ and TDS (0.73) indicate that Cl− and part of the Na+ are derived from anthropogenic sources. The observed higher Na+/Cl− ratio (avg. 1.8) in the surface water as compared with marine aerosols (Na+/Cl− = 0.85), suggests limited contribution from atmospheric precipitation and reveals that major ions are manly derived from weathering of rock forming minerals and anthropogenic sources. The poor correlation of Ca2+ with SO4 2− (0.30) indicates that gypsum dissolution could not be the major contributor for the dissolved ions in the water of study area. Further, a relatively high (Na++K+)/TZ+ i.e. 0.39 and low (Ca2++Mg2+)/(Na++K+) i.e. 2.7 ratios suggest that the silicate weathering is largely controlled chemical composition of surface water with limited contribution by carbonate dissolution. Computed WQI show significant correlation with the TDS (0.94), Na+ (0.83), K+ (0.75), Cl− (0.70), F− (0.69), HCO3 − (0.69), Mg2+ (0.66) and moderately correlated with TH (0.62), Ca2+ (0.60), SO4 2− (0.57) and NO3 − (0.49).
The data matrix of 13 variables (pH, EC, TDS, F−, Cl−, SO4 2−, NO3 −, HCO3 –, silica, Ca2+, Mg2+, Na+, K+) of twenty-five water samples were used for factor analysis. Three factors with eigen values >1 have been extracted from the principal factor matrix after varimax rotation. Factor loading, communalities for each variables, eigen values, percentage of variance and cumulative percent for three extracted factors are given in Table 4. The three extracted factors explain 52, 19 and 12 % of total variance, respectively, in the data matrix for the surface water of Pratapgarh. Factor-I contributes 52 % of the total variance and shows strong loading of pH, EC, TDS, Ca2+, Mg2+, Na+, K+, silica, SO4 2− and HCO3 −. Factor-I in the surface water is explicitly a lithogenic factor, which explains the dissolution of silicates with limited contribution from bicarbonate weathering. The second rotated factor (PC-II) accounts for 18.6 % of the variance and shows high loading of Cl− and low loading of Ca2+ and Mg2+, may be attributed to anthropogenic activities. Factor PC-III is less significant, accounts for only 12 % of the total variance and shows high loading of NO3 − and K+ and less loading of Na+. This factor may be attributed to the anthropogenic activities such as domestic and run off from the agricultural field. These three factors explain about 82 % of the total variance in the data matrix, indicating that the determined variables, which control the surface water chemistry of the area by silicate weathering with minor contribution from anthropogenic sources.
Surface water quality assessment
The data obtained by hydrogeochemical analyses of twenty-five surface water samples of Pratapgarh district were evaluated in terms of its suitability for drinking and domestic uses.
Potability of surface water for drinking and domestic uses
The physical and chemical parameters of the analytical results of surface water were compared with the standard guideline values recommended by the World Health Organisation (WHO 1997) and Bureau of Indian Standards (BIS 2003) for drinking and public health (Table 5). The pH of the surface water samples (6.8–9.8) are within the safe limit of 6.5–8.5, prescribed for drinking water except at sites 12 and 14. The turbidity is one of the important physical parameters for water quality, defining the presence of suspended solids in water and causes the muddy or turbid appearance of water body. The consumption of high turbid water may cause a health risk as excessive turbidity can protect pathogenic microorganisms from effects of disinfectants and stimulate the growth of bacteria during storage (Singh et al. 2013c; Tiwari and Singh 2014). In the present study area, the turbidity ranges from 1.4 to 342 NTU and exceeds the recommended value of 5 NTU in 76 % of surface water samples. The values of TDS exceed the desirable limit of 500 mg L−1 in 52 % analysed samples and maximum permissible limit of 1,000 mg L−1 in 20 % water samples of Pratapgarh district. The total hardness (TH) is an important parameter of water quality whether it is to be used for domestic, industrial or agricultural purposes. Hardness of the water is the property attributed to the presence of alkaline earths. It is property of water by which it prevents the lather formation with soap and increases the boiling point of water. Water can be classified into soft (75 mg L−1), moderately hard (75–150 mg L−1), hard (150–300 mg L−1) and very hard (>300 mg L−1) based on hardness (Sawyer and McCarty 1967). The TH of the analysed surface water of the study area varies between 86 and 716 mg L−1 (avg. 217 mg L−1) indicating moderately hard to very hard type of surface water. The analytical data indicate that 48 % surface water samples are moderately hard and 36 % are of hard categories, while 16 % water samples have hardness higher than 300 mg L−1, which is the desirable limit for drinking purposes (Fig. 5). The high hardness may cause encrustation on water supply distribution systems. Long-term consumption of extremely hard water might lead to an increased incidence of urolithiasis, anencephaly, prenatal mortality, some types of cancer and cardio-vascular disorders (Agrawal and Jagetia 1997). Fluoride is an essential element for maintaining normal development of teeth and bones. Concentration of F− exceeds the permissible limit of 1.5 mg L−1 in about 16 % water samples. Higher concentration of fluoride causes dental and skeletal fluorosis such as mottling of teeth, deformation of ligaments and bending of spinal chord (Tiwari and Singh 2014). Concentration of NO3 − is higher than the recommended level of 45 mg L−1 in 12 % of the surface water samples (Fig. 6). Excessive NO3 − in drinking water can cause a number of disorders including methemoglobinemia in infants, gastric cancer, goitre, birth malformations and hypertensions (Majumdar and Gupta 2000). Concentrations of Cl− exceeds desirable limit of 250 mg L−1 in about 12 % surface water samples of the Pratapgarh district. Concentrations of SO4 2− are well within the desirable limit of 200 mg L−1.
Sodium and potassium are the most important elements occurring naturally and mainly derived from weathering of rocks besides the sewage and industrial effluents (Singh and Hasnain 1999). A higher sodium intake may cause hypertension, congenial heart diseases and kidney problems (Singh et al. 2008) and the excess amount of potassium present in the water sample may lead nervous and digestive disorder (Tiwary 2001). The recommended permissible limit for sodium concentration in drinking water is 200 mg L−1 (WHO 1997). Concentration of Na+ is well within the recommended limit in surface water samples except at sites 14 and 23 (Fig. 7). Calcium and magnesium are the essential nutrients for plant growth and animals and play an important role in the development of bone, nervous system and cell. One possible adverse effect from ingesting high concentration of Ca2+ for long periods may be an increased risk of kidney stones (Maragella et al. 1996). Concentration of Ca2+ and Mg2+ are exceeding the desirable limits of 75 mg L−1 and 30 mg L−1 in 12 % and 36 % of the surface water samples, respectively. However, concentrations of Ca2+ and Mg2+ ions are within the maximum permissible limit of 200 mg L−1 and 100 mg L−1, respectively, except for Mg2+ at site 10. The presence of calcium and magnesium make the water hard.
Evaluation of water quality index
WQI is an important way to assess the quality of water in the recent years due to its usefulness for the understanding of water quality issues by integrating complex data (Tiwari and Mishra 1985; Singh 1992; Rao 1997; Mishra and Patel 2001). For computing WQI, three steps are followed. In the first step, each of the 12 parameters (pH, TDS, \({\text{F}}^{ - }\), \({\text{Cl}}^{ - }\), \({\text{NO}}_{3}^{ - }\), \({\text{SO}}_{4}^{2 - }\), \({\text{HCO}}_{3}^{ - }\), Ca2+, Mg2+, Na+, K+ and TH) has been assigned a weight (w i ) according to its relative importance in the overall quality of water for drinking purposes (Table 6). WQI is computed by adopting the following formula (Vasanthavigar et al. 2010; Tiwari et al. 2014).
The maximum weight of 5 has been assigned to the parameters like TDS, Na+, \({\text{F}}^{ - }\), \({\text{Cl}}^{ - }\), \({\text{NO}}_{3}^{ - }\) and \({\text{SO}}_{4}^{2 - }\) due to their major importance in water quality assessment (Vasanthavigar et al. 2010; Tiwari et al. 2014). HCO3 − is given the minimum weight of 1 as it plays an insignificant role in the water quality assessment. Other parameters like pH, Ca2+, Mg2+, K+ and TH were assigned weight (w i ) between 2 and 5 depending on their importance in water quality determination. In the second step, the relative weight (W i ) is computed from the following equation:
where, W i is the relative weight, w i is the weight of each parameter and n is the number of parameters. Calculated relative weight (W i ) values of each parameter are given in (Table 6).
In the third step, a quality rating scale (q i) for each parameter is assigned by dividing its concentration in each water sample by its respective standard according to the guidelines laid down in the BIS 10500 (2003) and WHO (1997), and the result is multiplied by 100:
where, q i the is the quality rating, C i is the concentration of each chemical parameter in each water sample in mg L−1 and S i is the BIS standard for each chemical parameter in mg L−1 according to the guidelines of the BIS 10500 (2003) and WHO (1997).
For computing the WQI, the SI is first determined for each chemical parameter, which is then used to determine the WQI as per the following equation
where, the SI i is the sub-index of ith parameter, q i is the rating based on concentration of ith parameter and n is the number of parameters.
Water can be classified into five categories based on the WQI value (Table 7). The computed WQI value in the Pratapgarh district of surface water ranges from 28 to 198 with an average value of 82. The highest WQI were calculated for the samples collected from the Bahaurpur, Sarav Naravan, Bahuta, Rajangarh, Chandpur, Manikpur and Pratapgharh sampling locations (Table 8). Among all of the surface water samples, the percentage (%) of WQI categories is Excellent (40 %), Good (32 %) and Poor (28 %). More than half the location falls under Excellent to Good category (Fig. 8).
Conclusions
The surface water of Pratapgarh district is mildly acidic to alkaline in nature. The chemistry of surface water is dominated by Na+ and Ca2+ and HCO3 − and Cl−. In majority of surface water samples, concentration of alkaline earth metals (Ca2++Mg2+) exceed alkali metal cations (Na++K+) and HCO3 − dominates over (SO4 2− + Cl−). Ca2+–Mg2+–HCO3 −, Ca2+–Mg2+–Cl− and Na+–HCO3 −–Cl− are the dominant hydrogeochemical facies in the surface water of the area. Our results suggest that the chemical composition of the surface water of Pratapgarh is largely controlled by rock weathering with minor contributions from agriculture and anthropogenic sources. In majority of the samples, the analysed parameters are well within the desirable limits and water is potable for drinking purposes. However, concentrations of TDS, TH, F−, NO3 −, Na+, Ca2+, and Mg2+ exceeded the desirable limit at few sites. The WQI shows that 72 % of surface water samples were found as Excellent to Good categories and can be used for direct consumption, while 28 % water samples are of Poor category. The water which is not suitable for direct consumption requires treatment before its utilization.
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Acknowledgments
The authors are grateful to Dr. Amaledu Sinha, Director, Central Institute of Mining and Fuel Research for his kind support and permission to publish this paper. Authors also are thankful to Council of Scientific and Industrial Research, New Delhi for the financial support under IAP mode of 11th Five Year Plan Project. We thank Dr. B. K. Tewary, Dr. Mukesh Kumar Mahato and other laboratory colleagues for their support and encouragement. Our hearty thanks to the Editor-in-Chief and anonymous reviewer for their valuable suggestions to improve the study in the present form.
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Tiwari, A.K., Singh, A.K., Singh, A.K. et al. Hydrogeochemical analysis and evaluation of surface water quality of Pratapgarh district, Uttar Pradesh, India. Appl Water Sci 7, 1609–1623 (2017). https://doi.org/10.1007/s13201-015-0313-z
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DOI: https://doi.org/10.1007/s13201-015-0313-z