原子荧光冷汞法测定地表水中的汞

建立原子荧光冷汞法测定地表水中的汞,通过实验及查阅相关资料对部分实验条件,如仪器的负高压和灯电流、屏蔽气和载气的流量、硼氢化钾和氢氧化钠的浓度、酸及其浓度等进行了优化。在最佳实验条件下汞的检出限为0.019μg/L,相关系数r>0.999,加标回收率为93.7%～106.4%,相对标准偏差0.79%～3.59%。实验结果表明:原子荧光冷汞法测定地表水中的汞具有简便、快速、清洁、高效、安全等优点,灵敏度高、精确度和准确度好、检出限低,是测定地表水中汞含量的有效方法。

DETERMINATION OF MERCURY CONCENTRATION IN SURFACE WATER USING ATOMIC FLUORESCENCE COLD MERCURY METHOD

The atomic fluorescence cold mercury method was used to determinate mercury concentration in surface water.Through experiments and consulting to relevant reference,the experimental conditions,such as negative high voltage and the lamp current,shielding gas and carrier gas flow rate,potassium borohydride,sodium hydroxide and acid concentration,had been optimized.The detection limit of mercury concentration was 0.019μg/L,the correlation coefficient r>0.999,the recovery of standard addition was between 93.7%~106.4%,and relative standard deviation was between 0.79%~3.59% in optimum conditions.The results show that cold atomic fluorescence mercury method has the advantage of simple operation,fast speed,cleanness,high efficiency,safety,high sensitivity,good precision and accuracy and low detection limit in determination of mercury in surface water,which is the effective method for determination of mercury concentration in surface water.