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
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
收藏
页码:1325 / 1330
页数:6
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