电感耦合等离子体原子发射光谱法测定自来水中铜、汞和铅

ICP-AES Determination of Copper Mercury and Lead in Tap Water

采用电感耦合等离子体原子发射光谱法测定自来水中痕量铜、汞和铅。自来水样加入硝酸(2+98)溶液调节溶液酸度,加入有机添加剂正丙醇提高被测元素的谱线强度及增大光谱的信背比。分析中采用高频发生器功率1100W和载气压力230kPa。在优化的试验条件下,铜、汞和铅的方法检出限(3s)依次为2.32,8.34,5.16μg·L^(-1)。应用此法平行测定自来水样5次,铜、汞和铅的相对标准偏差(n=5)依次为3.3%,8.0%,9.3%。

ICP-AES was applied to the determination of trace amout of Cu,Hg and Pb in tap water,The acidity of water sample was adjusied with HNO_3（2＋98）solution,and n-propyl alcohol was added to enhance intensity of spectral lines of the 3 elements determined and to raise the signal to background ratio of the spectra. High-frequency power of 1100 W and atomizing pressure of 230 kPa were taken in the analysis.Under the optimized conditions,detection limits（3s）of the method found were 2.32μg·L^-1for Cu,8.34μg·L^-1for Hg and 5.16μg·L^-1for Pb.The proposed method was used in the analysis of samples of tap water,and values of RSD＇s（n=5）of Cu.Hg and Pb found were 3.3%.8.0%and 9.3%respectively.