SUPERCRITICAL-FLUID EXTRACTION OF ORGANIC AND INORGANIC MERCURY FROM SOLID MATERIALS

被引：112

作者：

WAI, CM ^{[1
]}

LIN, YH ^{[1
]}

BRAUER, R ^{[1
]}

WANG, SF ^{[1
]}

BECKERT, WF ^{[1
]}

机构：

[1] US EPA,ENVIRONM MONITORING SYST LAB,LAS VEGAS,NV 89114

来源：

TALANTA | 1993年 / 40卷 / 09期

关键词：

D O I：

10.1016/0039-9140(93)80205-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mercuric ions (Hg2+) can be extracted from solid samples (cellulose matrix) using methanol modified supercritical CO2 containing the fluorinated chelating agent lithium bis(trifluoroethyl)dithiocarbamate (LiFDDC). Methylmercuric chloride (CH3HgCl) and dimethylmercury [(CH3)2Hg] can be extracted by supercritical CO2 without chelating agent and modifier. The solubility of Hg(FDDC)2 in supercritical CO2 has been determined to be 5 x 10(-3) M at 50-degrees-C and 150 atm, which is about 3 orders of magnitude greater than that of the non-fluorinated analogue Hg(DDC)2. Use of methanol (5%)-modified CO2 further enhances the solubility of Hg(FDDC)2 by a factor of 2.4. A small amount of water added to the sample matrix tends to facilitate the extraction of Hg(FDDC)2 and CH3HgCl. Potential applications of this in situ chelation-supercritical fluid extraction method for the preconcentration of mercury species and treatment of mercury contaminated wastes are discussed.

引用

页码：1325 / 1330

页数：6

共 18 条

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