摘要：Mercury in a solution is reduced to the elemental state by tin [II], and the elemental state mercury is aerated from the solution in a single-path system mercury analyser where the absorption is measured at 253.7 nm in a quartz gas-flow cell. The following conditions are required for the detemination of mercury in sulfuric acid solution. 1) Use of a separatory funnel as a reaction vessel is convenient for shaking and bubbling many sample solutions. The funnels of almost the same volume are used, and the ratio of vapor phase to liquid phase in a funnel is 1 or a little larger than I. 2) Acidity of a sample solution should be adjusted to almost the same degree as a standard mercury solution, because the absorbance of mercury increases with higher acidity. 3) Two ml of 10% SnCl2 solution is added to 50 ml of a sample solution, and the resulting solution is bubbled with air (2 liters/min) after shaking for 2 min. 4) Detectable range is 0.1-0.8 μg/50 ml on ×1 sensitivity and the lowest limit may be 0.01 μg/50 ml by change of sensitivity. The coefficient of variation is 2.87% at 0.5 μg/50 ml.
