用火焰原子吸收光谱法连续测定银、铜、锌  

Flame atomic absorption spectrometry method in successive determination of Ag,Cu,Zn

作　　者：李承元[1] 李蓉 补涛 

机构地区：[1]武警黄金第十支队,云南昆明650111

出　　处：《黄金地质》2004年第4期81-83,共3页Gold Geology

摘　　要：试样经NH4F,HCl,HNO3分解的酸性介质中,选用NaCl做配合剂,Ag,Cu,Zn可以同时进入溶液。但由于上机测定时背景吸收严重,而所使用的原子吸收分光光度计不能扣除背景。选用硫脲做配合剂时,可使Ag生成稳定无色的Ag[CS(NH2)2]Cl配合物,从而避免溶液中生成AgCl沉淀,同时也使测定时的酸度得到有效的降低。原来需要分别取样、溶解和测定Ag,Cu,Zn的操作,得以在同一份样品中完成。用火焰原子吸收分光光度计连续测定Ag,Cu,Zn,方法的测定范围分别为Ag0 n×10-6～5000 0×10-6;Cu0 00n%～n 000%;Zn0 00n%～n 000%。Disintegrated by NH_4F,HCL and HNO_3 in an acidic medium,Ag,Cu,Zn were resolved at the same time with NaCl as complex.The background absorption was strong and could not be removed when using the atomic absorption spectromtry.Choosing the thiourea as complex,to make Ag as a stable colorless complex:Ag[CS(NH_2)_2]Cl, the solution was avoided to forming AgCl settlings,and the acidity was reduced efficiently while determining.The sampling,resolving and determination of Ag,Cu, Zn could be finished at the same time in one sample by the method.The range of determination of the method are Ag 0.n×10^(-6)～5 000.0×10^(-6);Cu 0.00n%～n.000%;Zn 0.00n%～n.000%.

关 键 词：原子吸收光谱 配合剂 硫脲 

分 类 号：O657.31[理学—分析化学]