摘要
由于光谱分析方法具有多元素同时测定的优点,故在化探中得到了广泛的应用。但至今在国内外书刊中所介绍的这类分析方法尚未能满足当前区域化探工作的要求。为此,本文制订了一种加罩电极载体蒸馏和电弧浓缩相结合的光谱分析方法,可在同一根电极上分组连续测定银、砷、硼、钡、铍、铋、镉、铈、钻、铬、铜、铁、镓、锗、汞、铟、镧、锂、锰、钼、铌、镍、铅、锑、钪、锡、锶、碲、钍、钛、铊、钒、钨、钇、镱、锌和锆等37种元素。
Detection limits of volatile elements were effectively lowered by using the spectrometry with a covered electrode and chosing a mixture of ammonium iodide,precipitated sulfur,sodium sulfate and graphite powder as buffer.In conjunction with the conventioned arc concentration technique,the method allowed continuous multi-element batch determinations.Measurements were made using a PGS-2 planegrating spectrograph,with an a.c.arc as the light source and a current of 13A.37 elements can be measured on the same electrode.The detection limits of the 37 elements are as follows(ppm).Ag 0.03,As 3,B 3,Ba 1,Be 0.4,Bi 0.03,Cd 0.1,Ce 10,Co 0.8,Cr 1,Cu 0.3,Fe<100,Ga 1,Ge 0.1,Hg 0.2,In 0.02,La 3.6,Li 7.2,Mn<10,Mo 0.45,Nb 0.8,Ni 1,Pb 0.3,Sb 0.37,Sc 0.5,Sn 0.1,Sr 1,Te 0.3 Th 6,Ti<100,Tl 0.027,V 1,W 4,Y 1,Yb 0.36,Zn 3,Zr 1.This method generally gave a relative standard deviation of±5-10%for all the elements except Ba and Ga,which had a relative standard deviation of±10—20%.The analytical results obtained by this method agreed in the main with those for China’s geochemical standard reference samples(GSD 1—8)and U.S.G.S.geochemical standard reference samples(GXR 1—6),the relative error being within±30%.Averagely each person was able to analyse five samples per day.
作者
沈瑞平
Shen Ruiping(Laboratory of Jiangsu Bureau of Geology)
出处
《地质论评》
1983年第1期87-97,共11页
Geological Review
