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Ca 2+ and HCO 3 ‐ were the dominant ions within groundwater analyzed in this study, although the proportions of Cl ‐ and SO4 2‐ + NO3 ‐ progressively increased from the source area downstream along the Minjiang River to the Yangtze River. The degradation of groundwater quality was due to anthropogenic sulfur and nitrogen contamination within the basin. Sulfate δ 34 S values indicated that the primary source of sulfur in contaminated groundwater was air pollutants derived mainly from the combustion of coal, while contamination by household detergents and industrial waste acted to increase SO4 2‐ concentrations further downstream. Fertilizer also contributed to elevated SO4 2‐ concentrations; however, the area affected by fertilizer contamination was small in comparison with the area affected by other pollutant sources.

Degradation of groundwater quality due to anthropogenic sulfur and nitrogen contamination in the Sichuan Basin, China