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MERCURY REACTIONS IN THE PRESENCE OF CHLORINE SPECIES: HOMOGENOUS GAS PHASE AND HETEROGENOUS GAS-SOLID PHASE
Citation:
Lee, T. G., E J. Hedrick, AND P. Biswas. MERCURY REACTIONS IN THE PRESENCE OF CHLORINE SPECIES: HOMOGENOUS GAS PHASE AND HETEROGENOUS GAS-SOLID PHASE. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION. Air & Waste Management Association, Pittsburgh, PA, 52(11):1316-1323, (2002).
Impact/Purpose:
The goals of this research are to develop a method for measuring Hg concurrently with multiple metals at concentration levels of interest in human and dietary exposure studies using DIN-ICP/MS, and to validate the method by determining the concentration of multiple-metals plus total Hg in (1) drinking water, (2) beverages and (3) archived NHEXAS composite diet samples. A sub-objective of this work is to write a report for research planners that compares the costs and relative merits of the currently available Hg methods. This report would contain single lab data for Hg in dietary samples using ICP/MS, cold vapor atomic absorption (CVAA), and cold vapor atomic fluorescence (CVAF).
Description:
The kinetics of mercury chlorination (with HC1) were studied using a flow reactor system with an on-line Hg analyzer and spciation sampling using a set of impingers. Kinetic parameters, such as reaction order (a), activation energy (Eu) and the overall rate constant (k') were estimated based on the simple overall reaction pathway. The reaction order with respect of Chg,Eu and k' were found to be 1.55, 16.13 [kJ/mol] and 5.07 x 10 -2 exp(-1939.68/T) [ug/m 3)-0.55(s)-1], respectively. The effect of chlorine species (HC1, CH2Cl2) on the in situ Hg capture method previously developed 28 was also investigated. The efficiency of capture of mercury by this in situ method was higher than 98% in the presence of chlorine species. Furthermore under certain conditions, the presence of chlorine enhanced the removal of elemental mercury by additional gas phase oxidation.
