混酸体系-电感耦合等离子体质谱法测定进口铜精矿中稀土元素的含量  

Determination of Rare Earth Elements in Imported Copper Concentrate by Inductively Coupled Plasma Mass Spectrometry with Mixed Acid System

作　　者：王斌[1,2] 钟康华 余维芳 宋武元 甘久林 杨中民[1] Wang Bin;Zhong Kanghua;Yu Weifang;Song Wuyuan;Gan Jiulin;Yang Zhongmin(State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510641,China;Huangpu Customs Technology Center,Dongguan 523070,China;Guangzhou Customs District Technology Center,Guangzhou 510623,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,广东广州510641 [2]黄埔海关技术中心,广东东莞523070 [3]广州海关技术中心,广东广州510623

出　　处：《中国稀土学报》2022年第2期307-312,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家重点研发计划(2018YFF0215404)资助。

摘　　要：铜精矿中元素组成具有地质成因意义,建立进口铜精矿痕量特征成分分析方法,在产地溯源和掺假识别方面能够发挥重要作用,为口岸入境通关执法提供可靠依据。本方法对8个国家不同矿区的198份进口铜精矿中的稀土含量进行了分析,由于不同矿区的铜精矿成分组成存在差别,已有报道的消解方法不能完全适合所有样品,提出了常压高温HF-HClO_(4)酸-勒福特王水-HClO_(4)消解体系对进口铜精矿样品进行消解,再用配有高基体进样系统和He气碰撞模式的电感耦合等离子体质谱仪测定La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y等15种稀土元素的含量。在铜精矿的混酸消解体系方法方面进行了重点研究,通过样品性质和不同种类酸的作用机制,优化了混酸配比和添加顺序。选取具有代表性的铜精矿样品进行回收率、精密度及准确度试验,测得方法的回收率在98.3%~107.7%,精密度小于2.9%。计算了15种稀土元素的检出限均在0.00111~0.03680 mg·kg^(-1)。The composition of the elements in the copper concentrate has geological significance.The establish⁃ment of trace characteristic component analysis method for imported copper concentrate can play an important role in origin traceability and adulteration identification,and provide reliable basis for entry customs clearance and law enforcement at ports.The contents of rare earth in 198 imported copper concentrates from different min⁃ing areas of 8 countries were analyzed by this method.Due to the difference in the compositions of copper con⁃centrate from different mining areas,the digestion methods reported are not suitable for all samples.In this pa⁃per,hydrofluoric acid-perchloric acid-Lefort aqua regia-perchloric acid digestion system at atmospheric pressure and high temperature was proposed to digest imported copper concentrate samples,and then the contents of 15 rare earth elements,such as La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and Y,were de⁃termined by inductively coupled plasma mass spectrometry with high matrix injection system and helium colli⁃sion mode.The method of mixed acid digestion of copper concentrate was studied in detail.Based on the proper⁃ties of samples and the action mechanism of different kinds of acids,the mixture ratio and addition sequence of mixed acids were optimized.Representative copper concentrate samples were selected for recovery,precision and accuracy tests.The recoveries of the method were 94.7%~102.7%,the precision was less than 2.9%.The detection limits of 15 rare earth elements were calculated from 0.00111~0.03680 mg·kg^(-1).

关 键 词：电感耦合等离子体原子发射质谱法 铜精矿 稀土 

分 类 号：O657.31[理学—分析化学]