摘要
电气石是一种含硼的铝硅酸盐矿物,是重要的非金属矿产资源和成岩成矿作用的灵敏示踪剂,因类质同象置换普遍使其组成成分多变,主量元素为Si、B、Al、Fe和Mg,微量元素有稀土元素、Cu、Pb、Zn、Sn、Ag和Sr等。电气石的化学性质非常稳定,不能被一般的酸或碱完全溶解,本文采用硝酸-氢氟酸封闭压力溶矿,50%王水封闭压力复溶进行样品前处理,建立了电感耦合等离子体质谱法测定电气石中稀有轻金属、重金属、放射性金属、稀土元素等29种元素的分析方法。方法检出限为0.003~0.4μg/g,精密度(RSD,n=12)为0.9%~9.2%;国家标准物质的测定值与标准值基本相符,各元素的加标回收率为95%~105%。本方法解决了电气石样品难分解、复溶时易出现氢氧化铝微细残渣的问题,样品试液中B、Al、Fe等主要共存离子的干扰小,各待测元素测定结果准确、可靠。
Tourmaline is a boron-containing aluminosilicate mineral , which is an important non-metallic mineral resource , and an indicator for rock-forming and ore-forming processes.The chemical composition of tourmaline is highly variable due to the isomorphicsubstitution. The major elements of tourmaline are Si , Al , B , Fe and Mg , whereas the trace ekments are rare earth （ REE） , Cu , Pb , Zn ,Sn , Ag and Sr. The stable chemical propertiesmake it difficult to complete digestion by acid or alkaline reagents. Samples were digested by HN0 3-HF in a sealed and pressurized device. 50% aqua regia was used to repeat dissolution. Twenty nine trace elements in tourmaline including precious light metals , heavy metals , radioactive metals and rare earth elements were determined byInductively Coupled Plasma-Mass Spectrometry. The detection limits （ n = 12） ranged from 0. 003 to 0. 4 jxgg andthe relative standard deviations （RSD , n = 1 2 ） ranged from 0.2% to 2. 17%. The proposed method was applied to the determination of certified reference materials and the results were consistent with the certified values. The recoveries of elements ranged from 9 0 % to 110%. This method solves the problem for difficult dissolution of the tourmaline sample and the fine residue of aluminum hydroxide in the redissolution process. The coexisted ions B , Al and Fe in sample solutions show only slight interference , and the measurement results.
出处
《岩矿测试》
CSCD
北大核心
2017年第3期231-238,共8页
Rock and Mineral Analysis
基金
国土资源公益性行业科研专项(201311096-03)
关键词
电气石
轻金属元素
稀土元素
封闭压力酸溶
电感耦合等离子体质谱法
tourmaline
light metal elements
rare earth elements
pressurized acid decomposition
InductivelyCoupled Plasma-Mass Spectrometry
作者简介
作者简介：成学海,高级工程师,主要从事岩矿测试分析工作.E-mail：chengxuehai2009@shu.com.
