title: Application of a sorbent trap system to gas-phase elemental and oxidized mercury analysis.
abstract: A sorbent trap that utilizes activated carbon (AC) as the solid trapping medium is a new technology for measuring total mercury (Hg) emissions from combustion facilities. In this study, sorbent trap technology was further developed, improved and evaluated at the laboratory scale. AC was impregnated with 5% aqua regia to enhance its Hg adsorption capacity. Sorbent traps spiked with an Hg standard solution were found to be reproducibly prepared and highly stable. The effect of the Hg concentration on the spiking efficiency was further investigated. The adsorption of elemental and oxidized Hg by the sorbent trap was studied under various experimental conditions (temperature, flow rate and inlet Hg concentration). The Hg concentration of the flue gas effluent from the sorbent trap was measured. In addition, the concentration of Hg adsorbed on the AC was determined by digesting the used AC with an acid according to US EPA method 3052 and then analyzing it with cold vapor atomic absorption spectrometry. Furthermore, the gas-phase Hg emissions from a combustion source were measured using the sorbent trap according to US EPA method 30B. The results showed that the sorbent trap could be used for Hg concentrations between 10.0 and 40.0 μg m(-3) and flow rates between 0.5 and 1.0 lpm with adsorption efficiencies greater than 90%.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.
authors.forename: Zishuo
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.
authors.forename: Yujin
authors.initials: Y
authors.lastname: Eom
authors.affiliation: Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea; Tenafly High School, 19 Columbus Drive, Tenafly, NJ, 07670, USA.
authors.forename: Michelle J
authors.initials: MJ
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea; Department of Earth and Environmental Engineering, Columbia University, 500 W. 120th Street, New York, NY, 10027, USA. Electronic address: teddy.lee@yonsei.ac.kr.
authors.forename: Tai Gyu
authors.initials: TG
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis*; D002606:Charcoal / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D010084:Oxidation-Reduction; D013054:Spectrophotometry, Atomic / Q000379:methods
chemical_list: D000393:Air Pollutants; D005740:Gases; D002606:Charcoal; D008628:Mercury
keywords: Adsorption efficiency; Gas-phase elemental and oxidized Hg; Hg standard solution; Sorbent trap; Spike recovery