碳酸盐岩地层中B元素测试方法——一种改进的ICP-AES方法

The test of B in carbonate strata:An improved ICP-AES method

为解决碳酸盐岩地层中B元素分析困难的问题,采用HF-HNO3-HClO4-H3PO4溶样,电感耦合等离子体发射光谱法测定碳酸盐地层中的B元素。该方法的特点是,在溶样体系中加入适量H3PO4避免B元素的挥发损失,并对H3PO4最佳用量进行了试验。方法检出限3.8×10-6(10SD),用国家一级标准物质进行准确度、精密度验证,精密度(RSD)小于6.44%,准确度(ΔlgC)小于0.087。该方法还可以同时测定Be、Ba、Cr、Cu、Co、Ni、Pb、Mo、V、Mn、Li、Zn、Ga等十几种元素,也适用于土壤、岩石、水系沉积物其它样品中B等多元素同时测定。运用该方法测试了西南天山哈拉奇地区碳酸盐地层中B、Co、Ni、Cu、Zn、Pb、Ba等元素,并对其地质意义进行了简要探讨。

With the inductively coupled plasma atomic emission spectrometry, the HF-HNO3-HCl04-H3PO4 dissolving samples were employed to determine B in carbonate formations. The method lies in adding an appropriate amount of H3PO4 in the sample dissolution system to avoid the loss of the volatile elements B and testing the optimum amount of H3PO4. The accuracy and precision of the method are demonstrated by analyzing the National Standard Reference Materials, and it is proved that the precision （RSD） is less than 6.44%, and the RE （AlgC） is less than 0.087. The method can also determine such elements as Be, Ba, Cr, Cu, Co, Ni, Pb, Mo, V, Mn, Li, Zn and Ga at the same time. The method can determine B and various other elements in soil, rock and stream sedi- ment samples. The method was used to determine B, Co, Ni, Cu, Zn, Pb and Ba in carbonate formation of Karaqi area in southeast Tianshan Mountains, and its geological significance was discussed in this paper.