重庆老龙洞岩溶地下河流域硝酸盐来源及生物地球化学过程[j]。

Yu-Yang Wang, Ping-Heng Yang, Jie-Ru Zhang
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引用次数: 0

摘要

2019年7月至2020年10月,采集重庆老龙洞岩溶地下河流域城市化过程中污水、井水和地下河水样,基于地球化学和硝酸盐双同位素(δ15N-NO3-和δ18O-NO3-)数据,确定硝酸盐的来源和生物地球化学过程。结果表明:①污水中硝酸盐同位素组成δ15N-NO3-在-3.3‰~ 14.6‰之间,δ18O-NO3-在-5.2‰~ 20.6‰之间,表明硝酸盐来源于粪肥污水、肥料和土壤有机氮;井水δ15N-NO3-和δ18O-NO3-变化范围分别为3.1‰~ 12.6‰和2.9‰~ 8.9‰,说明硝态氮主要来源于土壤有机氮和粪肥污水。地下河水体的δ15N-NO3-和δ18O-NO3-的变化范围分别为5.6‰~ 28.6‰和-2.0‰~ 15.7‰,表明城市污水和粪肥是主要的硝态氮来源。②基于MixSIAR模型,粪便和污水是地下河水体硝酸盐的主要来源,占总贡献的89.1%,土壤有机氮、肥料和大气降水的贡献分别为4.4%、3.4%和3.1%。③流域COD:ρ(NO3-)浓度比由低到高依次为井水(0.14 ~ 5.15)、地下河水(0.50 ~ 9.36)、污水(4.08 ~ 89.50)。只有50%的井水样品COD:ρ(NO3-)略高于0.65,这是发生反硝化的最小化学计量比。这表明,没有足够的COD浓度支持反硝化发生在井水。氮和氧同位素没有显著富集,进一步证实了这一点。高达90%的地下河水样COD:ρ(NO3-)大于0.65,双硝酸盐同位素同时富集,δ15N:δ18O为1.8,比值在1.3 ~ 2.1之间,表明发生了反硝化作用。所有废水样品的COD:ρ(NO3-)均远高于0.65,其中25%高于发生异化还原硝铵(DNRA)的化学计量比(29.34)。污水的δ15N-NO3-和ρ(NH4+):ρ(NO3-)同时升高,表明污水中可能发生了DNRA。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Sources and Biogeochemical Processes of Nitrate in the Laolongdong Karst Underground River Basin, Chongqing].

Samples of sewage, well water, and underground river water of the urbanized Laolongdong karst underground river basin in Chongqing, China were collected during July 2019 and October 2020 and measured to determine the nitrate origin and biogeochemical processes based on geochemistry and dual nitrate isotope (δ15N-NO3- and δ18O-NO3-) data. The results showed that:① the isotopic nitrate compositions of sewage ranged from -3.3‰ to 14.6‰ for δ15N-NO3- and from -5.2‰ to 20.6‰ for δ18O-NO3-, which indicated that nitrate originated from manure and sewage, fertilizer, and soil organic nitrogen. The δ15N-NO3- and δ18O-NO3- of well water varied from 3.1‰ to 12.6‰ and 2.9‰ to 8.9‰, respectively, suggesting nitrate was mainly from soil organic nitrogen and manure and sewage. For the underground river water, the δ15N-NO3- and δ18O-NO3- ranged from 5.6‰ to 28.6‰ and from -2.0‰ to 15.7‰, respectively, suggesting that municipal sewage and manure were the dominate nitrate sources. ② Based on the MixSIAR model, manure and sewage were the primary nitrate source of the underground river water, accounting for 89.1% of the total contribution, whereas the contributions of soil organic nitrogen, fertilizer, and atmospheric precipitation were 4.4%, 3.4%, and 3.1%, respectively. ③ In the basin, the concentration ratios of COD:ρ(NO3-) from low to high were as follows:well water (0.14-5.15), underground river water (0.50-9.36), and sewage (4.08-89.50). Only 50% of well water samples with COD:ρ(NO3-) were slightly higher than 0.65, which is the minimum stoichiometric ratio for denitrification occurrence. This indicated that there were insufficient COD concentrations to support that denitrification occurred in the well water. This was further verified by no significant enrichment of nitrogen and oxygen isotopes. As much as 90% of underground river water samples had a COD:ρ(NO3-) higher than 0.65, and the dual nitrate isotopes were simultaneously enriched with a δ15N:δ18O of 1.8, which is within the ratios ranging from 1.3 to 2.1, indicating that denitrification occurred. The COD:ρ(NO3-) for all wastewater samples was much higher than 0.65, of which 25% were higher than the stoichiometric ratio (29.34) for the occurrence of dissimilation reduction nitrate to ammonium (DNRA). The δ15N-NO3- and ρ(NH4+):ρ(NO3-) of sewage increased simultaneously, indicating that DNRA may have occurred in the sewage.

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