摘要
KCl denuder technique was meployed in the measurement of Hg(II) species in atmosphere firstly. Intensive lab tests indicate that Hg 0 can pass through KCl denuder freely, while Hg 2+ can be trapped in it very efficiently. The efficiencies for adsorbing inorganic Hg 2+ averaged between 95% to 100% with a gross mean of 98%, and those for absorption of organic Hg 2+ were around 94%. Mass balance calculation shows that mercury trapped in denuder can be quantitatively extracted by 1 mol/L HCl (super grade) and analysed by the method of SnCl 2 reduction CVAFS determination, thus, demonstrated the feasibility of KCl denuder in measurement of Hg(II) in atmosphere. Preliminary application at two sites Gteborg, Sweden and one site in Ireland, found 0 04—0 15 ng/m 3 of Hg(II) species, contributing to 2%—10% of the total mercury.
KCl denuder technique was meployed in the measurement of Hg(II) species in atmosphere firstly. Intensive lab tests indicate that Hg 0 can pass through KCl denuder freely, while Hg 2+ can be trapped in it very efficiently. The efficiencies for adsorbing inorganic Hg 2+ averaged between 95% to 100% with a gross mean of 98%, and those for absorption of organic Hg 2+ were around 94%. Mass balance calculation shows that mercury trapped in denuder can be quantitatively extracted by 1 mol/L HCl (super grade) and analysed by the method of SnCl 2 reduction CVAFS determination, thus, demonstrated the feasibility of KCl denuder in measurement of Hg(II) in atmosphere. Preliminary application at two sites Gteborg, Sweden and one site in Ireland, found 0 04—0 15 ng/m 3 of Hg(II) species, contributing to 2%—10% of the total mercury.
