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本文研究了应用(口白)啶溴试剂比浊测定雨水中SO_4~(2-)的分析条件。本法使用的设备简单,方法的灵期度高,SO_4~(2-)浓度在0.2—0.4μg/ml范围内符合比尔定律,检测低限比BaSO_4比浊法降低了10倍;用标准加入法测得方法的回收率为93—106％;分析速度快,一般样品在十分钟之内可以测量完毕;样品分析前的pH值控制在5—7为最好;为了保证浊度有好的稳定性,我们选择了合适的沉淀条件(沉淀器皿、沉淀剂加入方式和搅拌速度的控制)。
In this paper, the analytical conditions for the determination of SO_4 ~ (2- The method used in this method is simple, the method of the spiritual period is high, the concentration of SO_4 ~ (2) in the range of 0.2-0.4μg / ml Beer’s law in line with the detection limit lower than BaSO4 turbidimetry reduced by 10 times; The recovery rate of the method was 93-106%; the analysis speed was fast, the average sample could be measured within ten minutes; the pH value before the sample analysis was controlled at 5-7, the best; in order to ensure good turbidity Stability, we have chosen the appropriate precipitation conditions (sedimentation vessel, precipitant addition mode and stirring speed control).