Determination of Rare Earth Elements in Fluorite Samples by Open Boric Acid Dissolution and Inductively Coupled Plasma-Mass Spectrometry
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摘要: 萤石中稀土元素的研究对揭示成矿物质来源、成矿流体的性质和矿床成因均具有十分重要的意义。传统的过氧化钠碱熔-电感耦合等离子体质谱(ICP-MS)分析方法可以解决萤石中稀土元素的测定问题,但过氧化钠提纯难度高,过程繁杂,不宜大量样品的处理,且待测溶液总盐度大易产生基体干扰等;常规的酸溶法因使用的试剂一般为硝酸和氢氟酸,这些酸均不与萤石的主要成分氟化钙发生反应而很少应用。本文基于氟化钙能溶于硫酸和硼酸,采用硼酸溶液(10%硫酸和25%盐酸介质)和氢氟酸处理样品,硝酸提取,引入103Rh和185Re双内标,建立了硼酸溶液敞口酸溶ICP-MS测定萤石中稀土元素的分析方法。相比于传统的过氧化钠碱熔方法,本方法采用的试剂纯度高,可以有效地降低空白,方法检出限为0.002~0.016 μg/g,低于过氧化钠碱熔方法的检出限(0.006~0.058 μg/g),回收率在94.0%~107.6%之间,方法精密度(RSD)为0.7%~2.7%。本方法配制的硼酸溶液能够有效地与萤石反应,可充分分解萤石样品,简化了样品处理流程,有效地控制了稀土元素的损失,数据可靠性高,适用于大量萤石样品的稀土元素分析。
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关键词:
- 萤石 /
- 稀土元素 /
- 硼酸溶液 /
- 敞口酸溶 /
- 电感耦合等离子体质谱法
Abstract: The research of rare earth elements (REEs) in fluorite has very important significance for determining the source of ore-forming materials, the nature of ore-forming fluid and genesis. The determination of REEs in fluorite can be solved by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) with sodium peroxide fusion, but the sample handling process is complex; sodium peroxide is difficult to purify and matrix interferences derive from high salinity solution, making it unsuitable for processing large numbers of samples. Nitric acid and hydrofluoric acid, which are used for the conventional method, do not react with calcium fluoride, which can be dissolved in sulfuric acid and boric acid. To this end, a method for the determination of 15 rare earth elements in fluorite by ICP-MS has been developed. The fluorite samples were decomposed with boric acid solution (media with 10% H2SO4 and 25% HCl) and hydrofluoric acid in PTFE beakers, and then dissolved with nitric acid. Two internal standards of 103Rh and 185Re were selected to compensate the drift of analytical signals and correct matrix effects by ICP-MS. Compared with the traditional sodium peroxide alkali fusion method, this method adopted the reagents of high purity which can reduce the background effectively. The detection limits were 0.002-0.016 μg/g, which is lower than that by sodium peroxide fusion (0.006-0.058 μg/g), and the precisions were 0.7%-2.7%. The results of this method were consistent with the results by sodium peroxide fusion. The new established method was is simple and had has a low detection limit for processing large numbers of fluorite samples. -
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表 1 仪器工作参数
Table 1 Operating parameters of the ICP-MS instrument
工作参数 设定条件 工作参数 设定条件 功率 1400 W 截取锥(镍锥)孔径 0.8 mm 冷却气(Ar)流量 15.4 L/min 测量方式 跳峰 辅助气(Ar)流量 0.80 L/min 进样泵速 30 r/min 雾化气(Ar)流量 0.86 L/min 测量模式 标准 采样锥(镍锥)孔径 1.0 mm 总采集时间 36 s 表 2 方法检出限
Table 2 Detection limits of the method
元素 内标 检出限/(μg·g-1) 元素 内标 检出限/(μg·g-1) 碱熔 酸溶 碱熔 酸溶 89Y 103Rh 0.014 0.011 159Tb 185Re 0.023 0.003 139La 103Rh 0.031 0.012 163Dy 185Re 0.008 0.005 140Ce 103Rh 0.058 0.016 165Ho 185Re 0.019 0.003 141Pr 103Rh 0.007 0.005 166Er 185Re 0.006 0.004 146Nd 103Rh 0.040 0.010 169Tm 185Re 0.016 0.002 147Sm 103Rh 0.009 0.007 172Yb 185Re 0.007 0.003 151Eu 103Rh 0.007 0.006 175Lu 185Re 0.011 0.003 157Gd 185Re 0.015 0.009 表 3 方法精密度
Table 3 Precision tests of the method
元素 测定平均值
w/(μg·g-1)RSD/% 元素 测定平均值
w/(μg·g-1)RSD/% 89Y 30.2 0.7 159Tb 0.30 1.6 139La 6.18 1.0 163Dy 2.36 1.9 140Ce 11.0 1.2 165Ho 0.68 1.6 141Pr 1.15 2.0 166Er 2.71 2.2 146Nd 4.23 0.9 168Tm 0.60 2.7 147Sm 1.12 1.2 172Yb 5.22 2.0 151Eu 0.55 2.1 175Lu 1.03 2.1 157Gd 1.55 1.3 表 4 方法准确度
Table 4 Accuracy tests of the method
元素 ρ/(ng·mL-1) 回收率/% 样品含量 加标量 样品加标后
测量结果89Y 30.5 50.0 81.22 101.4 139La 6.18 5.0 11.08 98.0 140Ce 11.0 10.0 20.65 96.5 141Pr 1.21 2.0 3.33 106.0 146Nd 4.22 5.0 9.38 103.2 147Sm 1.09 1.0 2.13 104.0 151Eu 0.55 0.5 1.04 98.0 157Gd 1.58 2.0 3.49 95.5 159Tb 0.28 0.5 0.76 96.0 163Dy 2.29 2.0 4.38 104.5 165Ho 0.72 1.0 1.66 94.0 166Er 2.73 5.0 7.88 103.0 169Tm 0.56 0.5 1.11 104.0 172Yb 5.18 5.0 10.56 107.6 175Lu 1.09 1.0 2.12 103.0 表 5 过氧化钠碱熔和硼酸敞口酸溶处理样品的分析结果对比
Table 5 Analytical results of REEs with sodium peroxide fusion and boric acid dissolution
元素 过氧化钠碱熔 w/(μg·g-1) 硼酸溶液敞口酸溶 w/(μg·g-1) 样品1 样品2 样品3 样品4 样品1 样品2 样品3 样品4 89Y 30.1 183.0 172.0 115.0 29.6 185.0 171.0 113.0 139La 6.44 16.17 14.63 9.28 6.12 16.30 16.30 9.60 140Ce 12.00 29.64 30.55 16.12 10.7 27.40 29.60 15.60 141Pr 1.21 2.94 3.52 1.65 1.91 3.07 3.46 1.77 146Nd 4.35 11.33 11.44 6.17 4.26 11.90 13.30 6.64 147Sm 1.18 4.08 3.93 1.83 1.11 4.02 4.35 1.92 151Eu 0.56 2.18 2.22 0.90 0.57 2.19 2.49 0.96 157Gd 1.69 7.49 6.95 3.49 1.56 7.56 7.67 3.55 159Tb 0.32 1.59 1.50 0.84 0.31 1.55 1.63 0.85 163Dy 2.46 11.58 11.04 7.20 2.38 11.80 12.70 7.81 165Ho 0.68 2.83 2.78 2.20 0.68 2.92 3.22 2.42 166Er 2.81 9.98 10.14 9.30 2.69 10.0 11.30 9.84 169Tm 0.60 1.76 1.82 1.80 0.59 1.77 2.07 1.95 172Yb 5.47 14.16 14.76 14.76 5.21 14.1 16.50 15.90 175Lu 1.08 2.59 2.68 2.71 1.05 2.61 3.08 2.93 表 6 GBW 07108的准确度
Table 6 Accuracy tests of GBW 07108
元素 w/(μg·g-1) 元素 w/(μg·g-1) 标准值 测定值 标准值 测定值 89Y 9.10 9.06 159Tb 0.35 0.34 139La 15.0 15.03 163Dy 1.60 1.58 140Ce 25.0 24.98 165Ho 0.33 0.32 141Pr 3.40 3.42 166Er 1.10 1.13 146Nd 12.0 11.97 168Tm 0.17 0.18 147Sm 2.40 2.45 172Yb 0.90 0.92 151Eu 0.51 0.53 175Lu 0.14 0.15 157Gd 1.90 1.92 -
袁俊宏.我国萤石资源开发利用情况[J].化工新型材料,2005,33(6): 55-56,75. http://www.cnki.com.cn/Article/CJFDTOTAL-HGXC200506019.htm 王怀宇.世界萤石(氟石)生产消费及国际贸易[J].中国非金属矿工业导刊,2009(6): 54-58. http://epub.cnki.net/kns/detail/detail.aspx?QueryID=0&CurRec=1&recid=&FileName=LGFK200906018&DbName=CJFD2009&DbCode=CJFQ&pr= 魏金凤,段香芝,许东利,曾小兰.萤石化学成分分析方法探讨[J].非金属矿,2000,23(2): 17,37. http://www.cnki.com.cn/Article/CJFDTOTAL-FJSK200002006.htm 王蕾,何红蓼,李冰.碱熔沉淀-等离子体质谱法测定地质样品中的多元素[J].岩矿测试,2003,22(2): 86-92. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20030225&flag=1 李艳玲,熊采华,黄慧萍,陶德刚,方金东.基体分离-电感耦合等离子体质谱测定重晶石中超痕量稀土元素[J].岩矿测试,2005,24(2): 87-92. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20050225&flag=1 周国兴,刘玺祥,崔德松.碱熔ICP-MS法测定岩石样品中稀土等28种金属元素[J].质谱学报,2010,31(2): 120-124. http://epub.cnki.net/kns/detail/detail.aspx?QueryID=4&CurRec=1&recid=&FileName=ZPXB201002014&DbName=CJFD2010&DbCode=CJFQ&pr= 黄一帆,林文业,黄文琦,龙智翔.ICP-MS法测定土壤中十五种稀土元素[J].广东微量元素科学,2008,15(11): 46-49. doi: 10.3969/j.issn.1006-446X.2008.11.011 陈永欣,黎香荣,韦新红,吕泽厄,谢毓群,蔡维专.微波消解-电感耦合等离子体质谱法测定土壤和沉积物中痕量稀土元素[J].岩矿测试,2011,30(5): 560-565. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20110507&flag=1 黄凤妹.微波消解-电感耦合等离子体质谱法检测土壤中16种稀土元素[J].中国无机分析化学,2012,2(1): 43-46. http://epub.cnki.net/kns/detail/detail.aspx?QueryID=12&CurRec=1&recid=&FileName=WJFX201201011&DbName=CJFD2012&DbCode=CJFQ&pr= 何红蓼,李冰,韩丽荣,孙德忠,王淑贤,李松.封闭压力酸溶ICP-MS法分析地质样品中47个元素的评价[J].分析试验室,2002,21(5): 8-12. http://epub.cnki.net/kns/detail/detail.aspx?QueryID=16&CurRec=1&recid=&FileName=FXSY200205003&DbName=CJFD2002&DbCode=CJFQ&pr= 张保科,温宏利,王蕾,马生凤,巩爱华.封闭压力酸溶-盐酸提取-电感耦合等离子体质谱法测定地质样品中的多元素[J].岩矿测试,2011,30(6): 737-744. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20110615&flag=1 刘晔,第五春荣,柳小明,袁洪林.密闭高压高温溶样ICP-MS测定56种国家地质标准物质中的36种痕量元素——对部分元素参考值修正和定值的探讨[J].岩矿测试,2013,32(2): 221-228. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20130207&flag=1 王君玉,吴葆存,李志伟,韩敏,钟莅湘.敞口酸溶-电感耦合等离子体质谱法同时测定地质样品中45个元素[J].岩矿测试,2011,30(4): 440-445. http://www.ykcs.ac.cn/ykcs/ch/reader/view_abstract.aspx?file_no=20110409&flag=1 岩石矿物分析编委会.岩石矿物分析(第四版 第二分册)[M].北京: 地质出版社,2011: 349-350. 陈福强,何光涛,李其英.地质样品中微-痕量稀土元素ICP-MS测定[J].广州化工,2011,39(14): 115-117. doi: 10.3969/j.issn.1001-9677.2011.14.042 Smirnova E V, Fedorova I N, Sandimirova G P, Petrov L L, Balbekina N G, Lozhkin V I. Determination of rare earth elements in black shales by inductively coupled plasma mass spectrometry [J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2003,58(2): 329-340. doi: 10.1016/S0584-8547(02)00152-0
王初丹,侯明.电感耦合等离子体质谱法测定地质样品中的稀土、钍元素[J].桂林理工大学学报,2011,31(3): 454-456. http://www.cnki.com.cn/Article/CJFDTOTAL-GLGX201103025.htm
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