On the basis of the standard HJ 757-2015"Water quality-Determination of chromium in-Flame atomic absorption spectrophotometry"(hereinafter referred to as the"Ministry of Environmental Protection standard"),some research on the determination method of chromium in water quality is conducted.Experiment 1:The 100g/L ammonium chloride solution added to the chromium standard curve of the"Ministry of Environmental Protection standard"was expanded to 0,20,40,60,80,100,120,140,160,180 and 200 g/L ammonium chloride solutions.Other reagents were the same as the"Ministry of Environmental Protection standard".The effect of ammonium chloride on the determination of chromium was studied by changing the mass concentration of the ammonium chloride solution.Experiment 2:Select a certified standard sample of a certain concentration,add reagents synchronized with the above curve,only change the concentration of ammonium chloride solution,and prepare several sets of standard samples with the same mass concentration.Determine the optimal mass concentration of ammonium chloride by measuring chromium standard samples prepared with different ammonium chloride concentrations through chromium standard curves prepared with different ammonium chloride concentrations.
万方数据
维普
