Phosphate oxygen isotope fractionation factors of phosphogypsum leachate in water and soil media
编号:2385 访问权限:仅限参会人 更新:2024-04-12 12:16:19 浏览:311次 张贴报告

报告开始:2024年05月18日 08:19(Asia/Shanghai)

报告时间:1min

所在会场:[SP] 张贴报告专场 [sp2] 主题2、地球化学

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摘要
The phosphate oxygen isotope (δ18Oₚ) method is one of the valuable tools to trace phosphorus pollution in water. As phosphogypsum leachate (PGL) is strongly acidic and contains complex components, it is challenge to trace the phosphorus pollution of PGL in underground water using δ18Oₚ. Herein, the influence of the primary environmental conditions (microbial condition and temperature) and the PGL properties (low pH and high concentrations of fluoride, sulfate, and calcium ions) on the fractionation of δ18Oₚ in soil and water media were investigated. It was found that the δ18Oₚ increased from 10.13‰ to 10.92‰ in the presence of microorganisms, while there was no significant change in the sterilized environment. The δ18Oₚ change value at relatively low-temperature condition (0.39‰) were lower than that at high-temperature condition (0.79‰) as the microorganisms were less active in the low-temperature environment. High concentrations of fluoride and calcium ions hampered both the fractionation rate and genetic fractionation effects of δ18Oₚ in the reaction system through suppressing the activities of microorganism and phosphatase. Likewise, low pH inhibited the activity of pyrophosphatase, thereby impeding the equilibrium fractionation effect of δ18Oₚ.That is, microorganisms were the main reason for the fractionation of δ18Oₚ in soil and water media. Under anaerobic condition, sulfate ions would lead to the fractionation of δ18Oₚ because of the reduce of sulfate ions by sulfate-reducing bacteria and the release of phosphate , while sulfate ions exhibited negligible influence on the fractionation of δ18Oₚ under aerobic condition. Furthermore, δ18Oₚ fractionation of actual PGL was observed in the soil and water media, which obeyed the Rayleigh fractionation model with a fractionation coefficient of -2.97‰ and the R² value of 0.977. This study explores the δ18Oₚ fractionation effects of PGL in soil and water media, offering a theoretical reference for its application in the source analysis of phosphorus.
 
关键词
Phosphate oxygen isotope,fractionation factor,isotope fractionation,phosphogypsum leachate,water and soil media
报告人
傅舜
硕士研究生 成都理工大学

稿件作者
傅舜 成都理工大学
谢燕华 成都理工大学
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重要日期
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    05月17日

    2024

    05月20日

    2024

  • 03月31日 2024

    初稿截稿日期

  • 03月31日 2024

    报告提交截止日期

  • 05月20日 2024

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青年地学论坛理事会
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厦门大学近海海洋环境科学国家重点实验室
中国科学院城市环境研究所
自然资源部第三海洋研究所
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