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The design and application of sequential extractions for mercury, Part 2. Resorption of mercury onto the sample during leaching

机译:汞连续萃取的设计和应用,第2部分。浸出过程中汞在样品上的吸收

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This paper examines the stability of Hg in a six-step sequential extraction scheme, focusing in particular on the first leach designed to extract ‘soluble’ Hg in sediment and soil samples. The recovery of Hg as a spike (Hg2+, equivalent to 15 ng g–1 in a sample), alone and mixed with a background granite ‘GG’, was found to be low and dependent on the time of extraction (15–60 min) in the following reagents: Ca(NO3)2, NaNO3, KNO3, CaCl2 and MgCl2. While the complexing action of thiourea stabilized Hg in solution (0.1M Ca(NO3)2), it also acted as an extractant itself and therefore could not be used to minimize resorption of Hg onto the sample during leaching.
机译:本文研究了六步连续 提取方案中Hg的稳定性,特别关注设计用于提取沉积物中“可溶性” Hg和的第一溶出 的稳定性。 土壤样品。单独并与以下物质混合以峰值形式回收Hg(Hg 2 + ,等效于 至15 ng g -1 )在以下 试剂中,发现背景 花岗岩'GG'含量低,且与提取时间(15-60分钟)有关 Ca(NO 3 2 ,NaNO 3 ,KNO 3 ,CaCl 2 和MgCl 2 。硫脲的 络合作用稳定了溶液中的汞(0.1M Ca(NO 3 2 ),汞本身也起萃取剂的作用,因此 在浸出过程中不能用于使汞在样品 上的吸收最小化。

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