摘要
本文建立了交流电弧直读原子发射光谱法测定地球化学样品中银、硼、锡、钼、铅的分析方法。以K_2S_2O_7、NaF、Al_2O_3、碳粉为缓冲剂,Ge为内标,优选了分析线对,曝光时间为25s,同时扣除分析线和内标线背景。选取国家一级地球化学标准物质(GBW07103、GBW07104、GBW07107、GBW07312、GBW07302a、GBW07304a、GBW07305a、GBW07307a、GBW07406、GBW07446、GBW07454、GBW07456)作为标准系列,以对数坐标二次曲线拟合标准曲线,并采取两次平行分析取平均值的计算方法。方法检出限为:Ag:0.011×10^(-6)、B:0.54×10^(-6)、Sn:0.19×10^(-6)、Mo:0.034×10^(-6)、Pb:0.66×10^(-6),精密度为:Ag:4.01%~8.33%、B:3.77%~7.86%、Sn:2.94%~8.17%、Mo:3.03%~10.94%、Pb:2.01%~11.11%。经岩石、水系沉积物、土壤国家一级标准物质验证,测定值与认定值符合。本方法操作简便、工作效率高,是一种新的测定地球化学样品中银、硼、锡、钼、铅的分析方法,可推广应用于大批量地球化学样品的分析测试。
The method for the determination of silver, boron, tin, molybdenum, lead in geochemical samples by AC-Arc direct reading atomic emission spectroscopy was studied in this paper. K2 S2O7, NaF, Al2O3 and carbon powder are prepared for buffers. Ge is used as internal standard element. Suitable analytical line pairs were selected, and the interception exposure time is 25s. The background of analytical lines and the internal standard line are corrected at the same time. National standards substances （GBW07103. GBW07104. GBW07107. GBW07312. GBW07302a. GBW07304a, GBW07305a. GBW07307a. GBW07406. GBW07446.GBW07454.GBW07456） were selected as standard series, and the standard curves are fitted with quadratic curve of the logarithmic coordinate. Each sample is parallelly analyzed two times, and the average value is taken as the result. The detection limits for Ag, B, Sn, Mo, Pb are 0.011×10^-6 ,0.54×10^-6 , 0. 19×10^-6, 0. 034×10^-6, 0.66×10^-6 , respectively. The precisions （RSD, n=12） for Ag, B, Sn, Mo, Pbare4.01% -8.33%, 3.77%-7.86%, 2.94%-8.17%, 3.03%-10.94%, 2.01%-11.11%, respectively. The analytical accuracy was validated by national standards substances of rocks, stream sediments and soils, the results were agreement with certified values. The method, which is convenient in operation and high in working efficiency, is a new analytical method for the determination of silver, boron, tin, molybdenum, lead in geochemical samples, and can be popularized to the determination of geochemical samples in large quantities.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2016年第8期2070-2082,共13页
Acta Geologica Sinica
基金
中央级公益性科研院所基本科研业务费专项项目(AS2013J11)
国土资源部公益性行业科研专项项目(编号201211081)
国土资源大调查项目(编号1212011120950
1212011220598)资助的成果
关键词
交流电弧直读原子发射光谱法
地球化学样品
银
硼
锡
钼
铅
AC-arc direct reading atomic emission spectroscopy
geochemical samples
silver
boron
tin
molybdenum
lead
