An Isotopic Dilution Approach for Quantifying Mercury Lability in Soils
作者： Waleed H. Shetaya , Stefan Osterwalder , Moritz Bigalke , Adrien Mestrot , Jen-How Huang
DOI: 10.1021/ACS.ESTLETT.7B00510
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摘要: The accurate estimation of soil mercury lability is crucial for risk assessment. In comparison to chemical fractionation and speciation, isotopic dilution (ID) offers precise definition labile fractions while maintaining the natural equilibrium. We developed applied an ID protocol with 199Hg estimate (Hg) isotopically exchangeable (labile) pool or HgE using a range industrially contaminated soils in Switzerland. measured values were consistent same against different spike levels (50, 100, 200% native 199Hg), indicating that spiked isotopes achieved required dynamic equilibrium at soil–water interface. Total Hg (THg; mg kg–1) was best predictor (mg %HgE accounted 96 63% variance, respectively. Nonetheless, despite wide THg (0.37–310 studied soils, spanned narrow (∼12–25% THg), highlighting large capacity se...
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