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The Development of Iodine Based Impinger Solutions for the Efficient Capture of Hg Using Direct Injection Nebulization Inductively Coupled Plasma Mass Spectrometry Analysis

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Abstract:Inductively coupled plasma mass spectrometry (ICP/MS) with direct injection nebulization (DIN) was used to evaluate novel impinger solution compositions capable of capturing elemental mercury (Hgo) in EPA Method 5 type sampling. An iodine based impinger solutoin proved to be very efficient for Hgo capture and was amenable to direct analysis by DIN-ICP/MS. Hgo capture efficiency using aqueous iodine (I3-) was comparable to Hgo capture using acidified potassium permanganate impinger solutions which were analyzed by cold vapor atomic absorption (CVAA), with greater than 98% capture of Hgo in the first oxidizing impinger. Using DIN-ICP/MS, it was demonstrated for the first time that iodine can be generated just prior to impinger sampling for efficiently oxidizing Hgo and retaining it in solution as HgI42-. Due to the increased interest Hg speciation from combustion sources, and the potential for using DIN-ICP/MS for mulitple metals analyses, an impinger sampling train for gaseous Hg speciation and multiple metals analyses using DIN-ICP/MS analyses is presented. The unique feature of such a sampling train is that each impinger solution in the series is amenable to direct analysis by DIN-ICP/MS. A bituminous coal was combusted in a bench scale coal system and gaseous Hg species (oxidized and elemental) were determined using the proposed impinger train. The DIN-ICP/MS instrumental detection limit was 0.003 ppb and MDLs ranged from 0.007 - 0.116 ug/L (ppb) in a variety of impinger solutions used for Hg capture.
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Citation:Hedrick, E. J., T. G. Lee, P. Biswas, and Y. Zhuang. The Development of Iodine Based Impinger Solutions for the Efficient Capture of Hg Using Direct Injection Nebulization Inductively Coupled Plasma Mass Spectrometry Analysis. ENVIRONMENTAL SCIENCE & TECHNOLOGY 35(18):3764-3773, (2001).
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Contact: Mary P. O'Bryant - (919)-541-4871 or obriant.mary@epa.gov
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Division: Microbiological & Chemical Exposure Assessment Division
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Branch: Chemical Exposure Research Branch
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Product Type: Journal
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Published: 09/15/2001
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Related Entries:
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Bullet Item The Determination of Mercury and Multiple Metals in Dietary Matrices Using Direct Injection Nebulization Inductively Coupled Plasma Mass Spectrometry (Din-ICP/MS)
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