Solving mercury (Hg) speciation in soil samples by synchrotron X-ray microspectroscopic techniques
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- 作者：Roberto Terzano ; Anna Santoro ; Matteo Spagnuolo ; Bart Vekemans ; Luca Medici ; Koen Janssens ; Jö ; rg Gö ; ttlicher ; Melissa A. Denecke ; Stefan Mangold ; Pacifico Ruggiero
- 关键词：Mercury ; Soil pollution ; Chlor-alkali ; Synchrotron ; X-rays microanalyses ; K106
- 刊名：Environmental Pollution
- 出版年：2010
- 出版时间：August 2010
- 年：2010
- 卷：158
- 期：8
- 页码：2702-2709
- 全文大小：840 K
文摘
Direct mercury (Hg) speciation was assessed for soil samples with a Hg concentration ranging from 7 up to 240 mg kg−1. Hg chemical forms were identified and quantified by sequential extractions and bulk- and micro-analytical techniques exploiting synchrotron generated X-rays. In particular, microspectroscopic techniques such as μ-XRF, μ-XRD and μ-XANES were necessary to solve bulk Hg speciation, in both soil fractions <2 mm and <2 μm. The main Hg-species found in the soil samples were metacinnabar (β-HgS), cinnabar (α-HgS), corderoite (Hg3S2Cl2), and an amorphous phase containing Hg bound to chlorine and sulfur. The amount of metacinnabar and amorphous phases increased in the fraction <2 μm. No interaction among Hg-species and soil components was observed. All the observed Hg-species originated from the slow weathering of an inert Hg-containing waste material (K106, U.S. EPA) dumped in the area several years ago, which is changing into a relatively more dangerous source of pollution.