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首页> 外文期刊>Environmental Science & Technology >Tracking sources of unsaturated zone and groundwater nitrate contamination using nitrogen and oxygen stable isotopes at the Hanford Site, Washington
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Tracking sources of unsaturated zone and groundwater nitrate contamination using nitrogen and oxygen stable isotopes at the Hanford Site, Washington

机译：在华盛顿州汉福德基地使用氮和氧稳定同位素追踪非饱和区和地下水硝酸盐污染的来源

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The nitrogen and oxygen isotopic compositions of nitrate in pore water extracts from unsaturated zone (UZ) core samples and groundwater samples indicate at least four potential sources of nitrate in groundwaters at the U.S. DOE Hanford Site in south-central Washington. Natural sources of nitrate identified include microbially produced nitrate from the soil column (delta(15)N of 4-8 parts per thousand, delta(18)O of -9 to 2 parts per thousand) and nitrate in buried caliche layers (delta(15)N of 0-8 parts per thousand, 6180 of -6 to 42 parts per thousand). Isotopically distinct industrial sources of nitrate include nitric acid in low-level disposal waters (delta(15)N similar to 0 parts per thousand, delta(18)O approximate to 23 parts per thousand) and co-contaminant nitrate in high-level radioactive waste from plutonium processing (delta(15)N of 8-33 parts per thousand, delta(18)O of -9 to 7 parts per thousand). The isotopic compositions of nitrate from 97 groundwater wells with concentrations up to 1290 mg/L NO3- have been analyzed. Stable isotope analyses from this study site, which has natural and industrial nitrate sources, provide a tool to distinguish nitrate sources in an unconfined aquifer where concentrations alone do not. These data indicate that the most common sources of high nitrate concentrations in groundwater at Hanford are nitric acid and natural nitrate flushed out of the UZ during disposal of low-level wastewater. Nitrate associated with high-level radioactive UZ contamination does not appear to be a major source of groundwater nitrate at this time.
机译：来自不饱和区（UZ）岩心样品和地下水样品的孔隙水提取物中硝酸盐的氮和氧同位素组成表明，华盛顿特区中南部的美国能源部汉福德基地的地下水中至少有四个潜在的硝酸盐来源。识别出的硝酸盐的自然来源包括微生物从土壤柱中产生的硝酸盐（δ（15）N为千分之八至八份，δ（18）O为千分之九至二千份）和埋藏的古驰层中的硝酸盐（δ（ 15）N为0-8千分之6180 -6至42千分之1）。硝酸盐在同位素上的独特工业来源包括低排放废水中的硝酸（δ（15）N近似为千分之0，delta（18）O近似为千分之23）和高放射性放射性污染物p加工产生的废物（δ（15）N为千分之八至33份，δ（18）O为千分之九至七份）。分析了97个地下水井中硝酸盐的同位素组成，其浓度高达1290 mg / L NO3-。来自该研究地点的稳定同位素分析具有天然和工业硝酸盐来源，可提供一种工具来区分无浓度含水层中的硝酸盐来源，而单独的浓度则无法做到。这些数据表明，汉福德地下水中硝酸盐浓度较高的最常见来源是硝酸和天然硝酸盐，在处理低含量废水时会从UZ中冲出。目前，与高放射性UZ污染有关的硝酸盐似乎不是地下水硝酸盐的主要来源。

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