直读发射光谱仪测定地质样品中银、硼和锡的含量  

Determination of Ag,B and Sn in Geochemical Samples with Direct Reading Atomic Emission Spectrometer

作　　者：杨俊[1] 代阿芳[1] 林庆文[1] 刘玉纯 马玲[1] 李光一 

机构地区：[1]安徽省地质实验研究所,合肥230041 [2]湖北省地质实验测试中心,武汉430034

出　　处：《理化检验（化学分册）》2017年第11期1296-1299,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：安徽省国土资源科技项目(2016-K-17)

摘　　要：地质试样0.100 0g(粒径小于0.074mm)与缓冲剂(质量分数之比为23∶20∶45∶12∶0.007的焦硫酸钾、氟化钠、氧化铝、碳和二氧化锗的混合物,其中锗为内标元素)0.100 0g混匀后置于下电极中并压实。选择上电极的直径为4mm,用直读发射光谱仪,按所选条件(激发电流14A,曝光时间35s)测定其中银、硼和锡的含量。以标准物质绘制校准曲线,上述3种元素的检出限(3s)依次为0.01,0.54,0.21μg·g^(-1)。按上述方法分析了8种标准物质,上述3种元素的测定值与认定值相符,测定值的相对标准偏差(n=12)依次为2.1%~16%,5.4%~12%,5.5%~9.1%。The geological sample（0.100 0 g,with grain size smaller than 0.074 mm）was mixed thoroughly with 0.100 0 g of a buffer mixture composing K_2S_2O_7,NaF,Al_2O_3,C and GeO_2 in the mass fraction ratio of 23∶20∶45∶12∶0.007 in which Ge acting as internal standard.The sample mixture was then added to the lower electrode and tightened.Diameter of the upper electrode selected was 4 mm.Ag,B and Sn in the sample were determined with direct reading atomic emission spectrometer under the selected conditions（excitation current：14 A;exposure time：35 s）.CRM′s were used for preparation of calibration curves.Values of detection limit（3 s）found for the 3 elements were 0.01,0.54,0.21μg·g^（-1） respectively.The proposed method was tested by analyzing 8 CRM′s giving results in consistency with the certified values and values of RSD′s（n=12）in the ranges of 2.1%-16%（for Ag）,5.4%-12%（for B）and 5.5%-9.1%（for Sn）.

关 键 词：直读原子发射光谱仪 地质样品 银 硼 锡 

分 类 号：O657.3[理学—分析化学]