Abstract
Abstract A collaborative study for the analysis of total mercury in fish is reported. The method is based upon a measurement of the volatilized mercury vapor by flameless atomic absorption. The fish muscle is digested with nitric-sulfuricperchloric acids. The mercury (II) is reduced with stannous chloride-hydroxylamine and then volatilized at room temperature in a stream of air. The air is pumped through a gas cell where the mercury vapor is measured by atomic absorption at 253.7 nm. Nine laboratories participated in the study. An overall mercury recovery of 83.5% and a standard deviation of 0.066 were obtained. Similar samples were analyzed by the official AOAC method. Results were erratic, with an overall mercury recovery of 46% and a range of 0 to 106%.
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