Stable isotope tracing theory applied for shallow groundwater pollution by power plant fly ash

Abstract：In order to determine Cr6+ pollution source of well water and ratio of waste water into groundwater around the power plant fly ash disposal site, hydrogen and oxygen stable isotopes of them were analyzed, and binary mixed model combined with local meteoric line (LML) was adopted.The results showed that the ratio of waste water into well water, where 500m downstream from the disposal site was 18.2 percent.The Cr6+ variations in waste water and well water were consistent, which illustrated the well water pollution by waste water infiltration.So, surface pollution sources of groundwater and the ratios of waste water into groundwater can be determined by hydrogen and oxygen stable isotope tracing theory combined with hydrochemistry results, which is beneficial to later groundwater pollution treatment.

Keyword：stable isotope;hydrochemistry;groundwater;pollution source;