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We report measurements of Hg, SO 2 , and halogens (HCl, HBr, HI) in volcanic gases from Masaya volcano, Nicaragua, and gaseous SO 2 and halogens from Telica volcano, Nicaragua. Mercury measurements were made with a Lumex 915+ portable mercury vapor analyzer and gold traps, while halogens, CO 2 and S species were monitored with a portable multi gas sensor and filter packs. Lumex Hg concentrations in the plume were consistently above background and ranged up to 350 ng m -3 . Hg/SO 2 mass ratios measured with the real-time instruments ranged from 1.1 × 10 -7 to 3.5 × 10 -5 (mean 2 × 10 -5 ). Total gaseous mercury (TGM) concentrations measured by gold trap ranged from 100 to 225 ng m -3 . Reactive gaseous mercury accounted for 1% of TGM, while particulate mercury was 5% of the TGM. Field measurements of Masaya's SO 2 flux, combined with the Hg/SO 2 ratio, indicate a Hg flux from Masaya of 7.2 Mg a -1 . At Masaya's low temperature famaroles, Hg/CO 2 mass ratios were consistently around 2 × 10 -8 , lower than observed in the main vent (Hg/C02 ∼ 10 -7 ). Low-temperature fumarole Hg fluxes from Masaya are insignificant (∼150 g a -1 ). Ratios of S, C and halogen species were also measured at Masaya and Telica volcanoes. CO 2 / SO 2 ratios at Masaya ranged from 2.8 to 3.9, comparable to previously published values. At Masaya molar Br/SO 2 was 3 × 10 -4 and I/SO 2 was 2 × 10 -5 , suggesting fluxes of 0.2-0.5 Mg HBr d -1 and 0.02-0.05 Mg HI d -1 . At Telica the Br/SO 2 ratio was also 3 × 10 -4 and the I/SO 2 ratio was 5.8 × 10 -5 , with corresponding fluxes of 0.2 Mg HBr d -1 and 0.06 Mg HI d -1 . Gases at both volcanoes are enriched in I relative to Br and Cl, compared to gases from volcanoes elsewhere. Copyright 2008 by the American Geophysical Union.

Original publication

DOI

10.1029/2007JB005401

Type

Journal article

Journal

Journal of Geophysical Research: Solid Earth

Publication Date

04/06/2008

Volume

113