Comparison between flux chambers and Fick's law for dissolved gaseous mercury determinations in the water atmosphere interface

摘要

DGM fluxes datas propitiates a key indication about the tendency of the mercury stay in water column or be lost to the atmosphere. Pick's law and fluxes chambers can be used for this purpose, and in this study both techniques were used on the same samples from the Negro River Basin, in the Amazon region, Brazil, with mercury measurements carried out after pre-concentration in quartz gold-sand columns and detection by Cold Vapor Atomic Fluorescence Spectrometry (CVAFS). Estimated values between less than +0.5 and +6.5 pmol M~(-2) h~(-1) were obtained using Pick's law and values between -20.7 and +32.7 pmol m~(-2) h~(-1) were measured using plexiglass flux chambers. Although different, the values obtained by both alternatives are closed in the sense of direction fluxes and consequently, in the indication of the water column permanence and bioaccumulation tendency.