稳定同位素示踪技术在电厂灰场对浅层地下水影响研究中的应用

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

为确定某电厂灰场周围井水中Cr6+污染来源及灰水混入比例,通过分析灰水和地下水的氢氧稳定同位素组成,结合当地大气降水直线,采用二元混合模型进行计算,结果表明,该灰场下游方向500 m处井水中灰水的入渗比例为18.2%.灰水和井水中Cr6+质量浓度变化一致,也说明灰水下渗对井水造成了污染.因此,结合水化学分析结果,利用氢氧稳定同位素示踪理论,可以确定地下水的地表污染源及混入比例,为今后地下水污染的治理提供了可靠的依据.

In order to determine Cr^6＋ 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 500 m downstream from the disposal site was 18.2 percent. The Cr^6＋ 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.