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将尿液湿法消解后,其中的汞在酸性条件下被硼氢化钾还原,经原子荧光光谱仪测定尿汞。结果显示,最佳条件为灯电流及负高压为20 mA、200 V,载气、屏蔽气分别400 ml/min和800 ml/min,原子化器高度为10 mm,读数时间为12 s,延迟1 s,载流为5%盐酸,还原剂为0.1%的硼氢化钾。该方法在0～10μg/L范围内线性相关系数在0.999 0～0.999 8,检出限可达0.002μg/L,精密度1.8%,具有应用及推广价值。
After the urine was digested by wet method, the mercury in the solution was reduced by potassium borohydride in acidic condition and the urine mercury was measured by atomic fluorescence spectrometry. The results showed that the optimum conditions were 20 mA, 200 V lamp current and negative high voltage, 400 ml / min and 800 ml / min respectively for carrier gas and shield gas, atomizer height of 10 mm, reading time of 12 s, 1 s, carrying 5% hydrochloric acid and reducing agent 0.1% potassium borohydride. The linear correlation coefficient of this method in the range of 0 ~ 10μg / L ranged from 0.999 0 to 0.999 8, the detection limit was up to 0.002μg / L and the precision was 1.8%, which had the value of application and popularization.