Abstract
Contamination of metals in agricultural soil is a serious global threat but there are limited reports related to their risks in major agronomic areas. The current study is aimed to assess the distribution of selected macroelements and essential/toxic trace metals (Ca, Mg, Na, K, Sr, Li, Ag, Fe, Zn, Co, Cu, Mn, Cd, Cr, Pb and Ni) in the agricultural soil of Chakwal, Pakistan, in order to appraise their contamination status, source identification and probable human health risks. Quantification of the metals was performed by AAS employing aqua regia digestion method. Among the selected metals, dominant mean concentrations were observed for Ca (48,285 mg/kg) and Fe (30,120 mg/kg), followed by Mg (9171 mg/kg), K (973.3 mg/kg), Mn (399.0 mg/kg) and Na (368.9 mg/kg). The correlation study indicated strong mutual relationships among the metals as well as physicochemical properties. Multivariate analysis (PCA/CA) of the metal levels revealed their diverse anthropogenic sources in the soil. Various pollution indices indicated extremely high contamination/enrichment of Cd, followed by moderate enrichment/contamination of Ag in the soil. The HQ values for most of the metals manifested insignificant non-cancer risks. The average CR value of Cr was exceeding the safe limit (1.0E-06) for both ingestion and inhalation exposure, indicating a considerable lifelong cancer risk for the population. The results of this study will provide a better understanding related to the contamination of agricultural soil and its effects on human health and to promote effective actions to reduce the soil pollution.
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Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
Code availability
Not applicable.
Abbreviations
- ABS:
-
Dermal absorption factor
- AF:
-
Adherence factor for soil to the skin
- AT:
-
Average time
- BD:
-
Bulk density
- B n :
-
Average geochemical background value
- BW:
-
Average body weight
- CA:
-
Cluster analysis
- Cf:
-
Contamination factor
- CF:
-
Unit conversion factor
- C m :
-
Average metal content in the soil or earth crust
- C n :
-
Mean metal content in the soil sample
- C o :
-
Reference value of the metal in uncontaminated soil
- CR:
-
Cancer risk
- C S :
-
Average level of the reference metal in soil or earth crust
- CSF:
-
Carcinogenic slope factor
- C soil :
-
Mean concentration of the metal in soil
- EC:
-
Electrical conductivity
- ED:
-
Exposure duration
- EDI:
-
Exposure daily intake
- EDIderm :
-
Estimated daily intake via dermal absorption
- EDIing :
-
Estimated daily intake via ingestion
- EDIinh :
-
Estimated daily intake via inhalation
- EF:
-
Enrichment factor
- EF:
-
Exposure frequency
- HI:
-
Hazard index
- HQing/derm/inh :
-
Hazard quotient via ingestion or dermal or inhalation routes
- I geo :
-
Geoaccumulation index
- ILCR:
-
Probability of an individual developing cancer over a lifetime
- ISO:
-
International organization for standardization
- mC d :
-
Modified degree of contamination
- PCA:
-
Principal component analysis
- PCs:
-
Principle components
- PEF:
-
Particulate emission factor
- QA:
-
Quality assurance
- QC:
-
Quality control
- RfD:
-
Corresponding reference dose
- R ing :
-
Rate of intake through ingestion
- R inh :
-
Rate of intake through inhalation
- SA:
-
Exposed skin area
- SD:
-
Standard deviation
- SE:
-
Standard error
- TDS:
-
Total dissolved solids
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The research facilities provided by Quaid-i-Azam University, Islamabad, Pakistan, to carry out this project are thankfully acknowledged.
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Batool, M., Shah, M.H. Appraisal of contamination, source identification and health risk assessment of selected metals in the agricultural soil of Chakwal, Pakistan. Environ Geochem Health 45, 8295–8316 (2023). https://doi.org/10.1007/s10653-023-01721-6
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DOI: https://doi.org/10.1007/s10653-023-01721-6