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对环境样品中汞的测定,通常的最后操作是在溶液中用氯化亚锡将二价汞还原为零价汞,然后以元素汞蒸气的形式吹进无火熖原子吸收或荧光分光光度计的吸收池进行测定?舛ń峁募锹计飨煊Ω叨?除了与还原溶液中汞的含量、吸收池大小,通气系统的死体积(dead volume)、溶液体积、气体流速及溶液酸度有关外,还受溶液温度的影响。本文作者发现,当溶液的温度由15℃增加到40℃时,汞蒸气的逸出速度可增加一倍,从作者所用的原子吸收-荧光分光光度计所测得记录器响应亦约增加一倍。因此,在测定中如果溶液的温度不保持恒定,就会影响分析结果。
The usual final measure of mercury in environmental samples is to reduce the divalent mercury to zero-valent mercury with stannous chloride in solution and then blow it as an elemental mercury vapor into a flameless atomic absorption or fluorescence spectrophotometer In addition to the amount of mercury in the reducing solution, the size of the sump, the dead volume of the aeration system, the volume of the solution, the gas flow rate and the acidity of the solution In addition, but also by the solution temperature. The authors found that when the temperature of the solution is increased from 15 ° C to 40 ° C, the escape velocity of mercury vapor can be doubled and the recorder response doubles about twice as measured by the authors’ use of atomic absorption spectrofluorometry . Therefore, if the temperature of the solution is not kept constant during the measurement, the result of the analysis will be affected.