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目的探讨测定饮用水中铅的实用方法。方法用原子荧光光度法,AFS-830双道荧光光度计测定饮用水中铅。结果用20g/L硼氢化钾作还原剂,2%盐酸载流,将铁氰化钾加入硼氢化钾溶液中稳定时间。在1.0~10.0μg/L范围内,荧光强度值与铅含量有良好线性关系,相关系数r=0.9992,回归方程y=51.09x+2.35。铅的检出限0.35μg/L,相对标准偏差2.31%,回收率93.4%~104.8%。结论该法操作简单,成本低、重复性好,适合基层单位饮用水中铅的检测。
Objective To explore a practical method for determination of lead in drinking water. Methods Determination of lead in drinking water by atomic fluorescence spectrometry and AFS-830 dual channel fluorescence spectrophotometer. Results 20g / L potassium borohydride as a reducing agent, 2% hydrochloric acid current, the potassium ferricyanide potassium borohydride solution was added to stabilize the time. In the range of 1.0 ~ 10.0μg / L, there was a good linear relationship between fluorescence intensity and lead content, the correlation coefficient r = 0.9992, the regression equation y = 51.09x + 2.35. The detection limit of lead was 0.35μg / L, the relative standard deviation was 2.31% and the recovery was 93.4% -104.8%. Conclusion The method is simple, low cost, good repeatability, suitable for the detection of lead in drinking water of grass-roots units.