【引用本文】 董学林, 何海洋, 储溱, 等. 碱溶沉淀分离-电感耦合等离子体质谱法测定伴生重晶石稀土矿中的稀土元素[J]. 岩矿测试, 2019, 38(6): 620-630. doi: 10.15898/j.cnki.11-2131/td.201901090004
DONG Xue-lin , HE Hai-yang , CHU Qin , et al. Determination of Rare Earth Elements in Associated Barite Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(6): 620-630. doi: 10.15898/j.cnki.11-2131/td.201901090004

碱溶沉淀分离-电感耦合等离子体质谱法测定伴生重晶石稀土矿中的稀土元素

1. 湖北省地质实验测试中心, 湖北 武汉 430034;

2. 国土资源部稀土稀有稀散矿产重点实验室, 湖北 武汉 430034;

3. 华中科技大学化学与化工学院, 湖北 武汉 430074

收稿日期: 2019-01-09  修回日期: 2019-04-29 

基金项目: 国家重点研发计划项目“重点领域急需化学成分量标准物质研究”(2016YFF020110308)

作者简介: 董学林,硕士,工程师,从事岩矿分析和环境分析工作。E-mail:dongxlin109@126.com。。

Determination of Rare Earth Elements in Associated Barite Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry

1. Hubei Province Geological Experimental Testing Center, Wuhan 430034, China;

2. Key Laboratory of Rare Mineral, Ministry of Land and Resources, Wuhan 430034, China;

3. School of Chemistry Engineering, Huazhong University of Science & Technology, Wuhan 430074, China

Received Date: 2019-01-09
Revised Date: 2019-04-29

摘要:采用ICP-MS法测定伴生重晶石轻稀土矿中的稀土元素时,Ba以及轻稀土元素La、Ce、Pr、Nd、Sm等对中重稀土造成严重的质谱重叠干扰,因此在保证矿石完全消解的同时,若能选择合适的前处理方法实现目标元素与基体的有效分离,将有利于减少质谱干扰。本文采用过氧化钠-碳酸钠熔融分解伴生重晶石的稀土矿样品,熔融物用三乙醇胺溶液提取,将沉淀过滤去除硅、铁、锰、锌等大量基体元素,而稀土元素与钡、锶、钙等留存于沉淀中,沉淀经盐酸溶解后再用氨水进行二次沉淀,将稀土元素与伴生的高含量钡、锶、钙等元素分离,分离率超过96%,从而极大地降低了由钡的氧化物和氢氧化物对153Eu等元素质量数的质谱干扰。轻稀土元素对中重稀土元素的干扰则通过测定高浓度的单元素标准溶液在m/z 138~175处的表观浓度来计算干扰校正系数,对干扰量进行扣除校正。该方法通过稀土矿石标准物质GBW07187、GBW07188验证,测定值与认定值的相对误差<10%;应用于伴生重晶石稀土矿石实际样品分析,相对标准偏差(RSD,n=12)为0.5%~4.6%,证明了本方法可用于分析高钡矿石中的稀土元素。

关键词: 重晶石, 稀土元素, 过氧化钠-碳酸钠熔融, 沉淀分离, , 电感耦合等离子体质谱法

Determination of Rare Earth Elements in Associated Barite Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry

KEY WORDS: barite, rare earth elements, sodium peroxide-sodium carbonate melting, precipitation separation, barium, inductively coupled plasma-mass spectrometry

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碱溶沉淀分离-电感耦合等离子体质谱法测定伴生重晶石稀土矿中的稀土元素

董学林, 何海洋, 储溱, 仇秀梅, 唐兴敏