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达里诺尔湖表层沉积物中Hg、As的形态分布及释放特性

DOI: 10.11654/jaes.2014.11.022, PP. 2228-2233

Keywords: 达里诺尔湖,沉积物,Hg,As,形态,释放

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Abstract:

以达里诺尔湖为研究对象,采用七步逐级连续化学提取法,系统开展了表层沉积物中Hg、As的形态分析研究,重点模拟了不同pH下表层沉积物中Hg、As的释放特性。结果表明,达里诺尔湖表层沉积物中Hg的生物有效态主导形态为腐植酸结合或络合态,As的生物有效态主导形态为碳酸盐与铁锰氧化物结合态。在实验pH范围内,碱性或弱碱性环境不利于Hg和As的释放,强碱性环境利于Hg和As的释放;经酸溶液浸提过的沉积物,因金属氧化物的溶解使腐植酸结合或络合态的Hg、As暴露并在碱提取液中释放;经碱溶液浸提过的沉积物,因腐植酸的溶解使铁锰氧化物结合态Hg、As暴露并在酸提取液中释放。保持达里诺尔湖水体偏碱性状态对湖泊的水环境健康和生态安全至关重要。

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