Abstract
The present study focuses on the evaluation of metal (chromium, copper, and lead), arsenic, and pesticide (atrazine and endosulfan) contamination in freshwater streams of one of the most important agricultural and industrial areas of central-eastern Argentina, which has not been reported earlier. The environmental fate of inorganic microcontaminants and pesticides was assessed. Samples were collected monthly for a year. Pesticide concentrations were measured in water; metal and arsenic concentrations were measured in water and sediments, and physicochemical variables were analyzed. In most cases, metals and arsenic in water exceeded the established guideline levels for the protection of aquatic biota: 98 and 56.25% of the samples showed higher levels of Cr and Pb, while 81.25 and 85% of the samples presented higher values for Cu and As, respectively. Cr, Pb, Cu, and As exceeded 181.5 times, 41.6 times, 57.5 times, and 12.9 times, respectively, the guideline level values. In sediment samples, permitted levels were also surpassed by 40% for Pb, 15% for As, 4% for Cu, and 2% for Cr. Geoaccumulation Index (Igeo) demonstrated that most of the sediment samples were highly polluted by Cr and Cu and very seriously polluted by Pb, which indicates progressive deterioration of the sediment quality. Atrazine never exceeded them, but 27% of the 48 water samples contained total endosulfan that surpassed the guidelines. The findings of this study suggest risk to the freshwater biota over prolong periods and possible risk to humans if such type of contaminated water is employed for recreation or human use. Improper disposal of industrial effluents and agricultural runoffs need to be controlled, and proper treatment should be done before disposal to avoid further deterioration of the aquifers of this area.
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Abbreviations
- AEQGs:
-
Argentine Environmental Quality Guidelines
- As:
-
Arsenic
- Atr:
-
Atrazine
- BOD:
-
Biological oxygen demand
- CEQGs:
-
Canadian Environmental Quality Guidelines
- COD:
-
Chemical oxygen demand
- Cr:
-
Chromium
- Cu:
-
Copper
- DO:
-
Dissolved oxygen
- EEA:
-
European Environment Agency
- End:
-
Endosulfan
- EPA:
-
Environmental Protection Agency
- EQGs:
-
Environmental quality guidelines
- FD:
-
Frequency of detection
- IC:
-
Inorganic carbon
- Igeo :
-
Geoaccumulation Index
- INIDEP:
-
Instituto Nacional de Investigación y Desarrollo Pesquero
- LAQUIGE:
-
Laboratorio de Química Geológica y Edafológica
- MAC:
-
Maximum allowable concentration
- MC:
-
Maximum concentration
- NA:
-
Not available
- ND:
-
No data
- Pb:
-
Lead
- PCA:
-
Principal component analysis
- S1:
-
Site one
- S2:
-
Site two
- S3:
-
Site three
- S4:
-
Site four
- SD:
-
Standard deviation
- Sed.:
-
Sediment
- SRP:
-
Soluble reactive phosphorus
- T. End:
-
Total endosulfan (α END, β END and END. SULFATO)
- TOC:
-
Total organic carbon
- TSS:
-
Total suspended solids
- WHO:
-
World Health Organization
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This research was supported by grants from the Universidad Nacional del Litoral, Project CAI +D No. 501 201101 00215 LI.
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Highlights
- Metals, arsenic, and pesticides in surface waters and sediments of central-eastern Argentina were monitored for 1 year. The status of pollution in relation to standard levels was considered in conjunction with other assessment methods.
- Similarly, to physicochemical variables, microcontaminant concentrations in sediments between sites were more informative about the impairment of the system than those between months.
- In water samples, findings suggest a serious level of metal pollution—mainly Cr, Pb, Cu and As, and pesticides mostly by endosulfan. In sediment samples, Pb, As, Cu, and Cr also surpassed the established international guideline levels.
- Proper measures in terms of technological innovations or improvements of public and private policies must be taken immediately in order to protect aquatic resources and human health.
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Regaldo, L., Gutierrez, M.F., Reno, U. et al. Water and sediment quality assessment in the Colastiné-Corralito stream system (Santa Fe, Argentina): impact of industry and agriculture on aquatic ecosystems. Environ Sci Pollut Res 25, 6951–6968 (2018). https://doi.org/10.1007/s11356-017-0911-4
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DOI: https://doi.org/10.1007/s11356-017-0911-4