Abstract:Rare earths are a key focus of geological exploration work and a new round of strategic exploration breakthroughs. The accurate determination of contents of rare earth elements in geochemical samples is very important. In this study, the sample was digested with nitric acid-hydrofluoric acid-perchloric acid-sulfuric acid system using an electric graphite digestion device equipped with polytetrafluoroethylene digestion tube. The determination of rare earth elements in geochemical samples by inductively coupled plasma mass spectrometry (ICP-MS) after digestion in micro-open system was realized. The results showed that the sample could be fully digested in micro-open system under the following conditions: the dosage of nitric acid-hydrofluoric acid-perchloric acid-sulfuric acid system was 8 mL; the highest digestion temperature was 240 ℃, which was kept for 2.5 h (total digestion time of 4.5 h). The linear correlation coefficients of calibration curves were all greater than 0.999. The limits of detection of this method were 0.001-0.03 μg/g, and the limits of quantification were 0.004-0.12 μg/g. The limits of detection for most rare earths in experiments were lower than those obtained by standard method DZ/T 0279.32-2016 and GB/T 14506.30-2010. The contents of rare earths in certified reference materials of stream sediment, soil and rock were determined according to the experimental method. The results showed that the logarithmic difference (Δlg) between the measurement values and certified values of elements was 0.00-0.03, and the relative standard deviations (RSD, n=6) were between 0.74% and 7.2%, which could meet the requirements of Δlg≤0.11 and RSD≤10% specified in DZ/T 0011-2015. The rare earth elements in certified reference materials of rock and soil were determined according to the experimental method and ICP-MS after acid dissolution in closed system. The measurement results of two methods were basically consistent. The acid consumption in this method was low and the sample digestion time was short. It could be used for the batch test of rare earth elements in geochemical samples.
陆海川, 袁新, 夏祥, 贾炳超, 刘涛, 龚仓. 微敞开体系消解-电感耦合等离子体质谱法测定地球化学样品中稀土元素[J]. 冶金分析, 2024, 44(2): 30-39.
LU Haichuan, YUAN Xin, XIA Xiang, JIA Bingchao, LIU Tao, GONG Cang. Determination of rare earth elements in geochemical samples by inductively coupled plasma mass spectrometry after digestion in micro-open system. , 2024, 44(2): 30-39.
[1] 冯先进,马丽.电感耦合等离子体质谱(ICP-MS)法在我国矿物中“四稀”元素检测的应用[J].中国无机分析化学,2023,13(8):802-812. FENG Xianjin,MA Li.Application of inductively coupled plasma mass spectrometry(ICP-MS) for the detection of rare, rare earth, rare scattering and precious elements in minerals in China[J].Chinese Journal of Inorganic Analytical Chemistry,2023,13(8):802-812. [2] 曾美云,何启生,邵鑫,等.全自动石墨消解-电感耦合等离子体质谱法测定岩石样品中稀土元素[J].华南地质,2022,38(4):708-714. ZENG Meiyun,HE Qisheng,SHAO Xin,et al.Determination of rare earth elements in rock by inductively coupled plasma mass spectrometry with automatic graphite digestion[J].South China Geology,2022,38(4):708-714. [3] 邹佳作,聂飞,郭金承.四川冕宁——德昌地区发现离子吸附型稀土矿点[J].中国地质,2023,50(2):648-649. ZOU Jiazuo,NIE Fei,GUO Jincheng.New discovery of ion-absorption type REE mineral occurrence in the Mianning-Dechang area,Sichuan Province[J].Geology in China,2023,50(2):648-649. [4] 李丽君,王娜.电感耦合等离子体质谱法测定高岭土中的15种稀土元素[J].理化检验(化学分册),2017,53(6):689-692. LI Lijun,WANG Na.Determination of 15 rare earth elements in Kaolin by ICP-MS[J].Physical Testing and Chemical Analysis (Part B:Chemical Analysis),2017,53(6):689-692. [5] 李鹰,俞晓峰,寿淼钧,等.电感耦合等离子体质谱法测定岩石和水系沉积物中痕量稀土元素[J].冶金分析,2016,36(2):33-37. LI Ying,YU Xiaofeng,SHOU Miaojun,et al.Determination of trace rare earth elements in rock and stream sediments by inductively coupled plasma mass spectrometry[J].Metallurgical Analysis,2016,36(2):33-37. [6] 马莉,司晗.微波消解样品-电感耦合等离子体质谱法同时测定土壤中重金属元素和稀土元素[J].环境科学导刊,2016,35(2):88-91. MA Li,SI Han.Determination of heavy metals and rare earth elements in soils by inductively coupled plasma-mass spectrometry with microwave digestion[J].Environmental Science Survey,2016,35(2):88-91. [7] 于亚辉,刘军,李小辉,等.高压密闭消解-电感耦合等离子体质谱法测定地球化学样品中的50种元素[J].理化检验(化学分册),2019,55(7):833-839. YU Yahui,LIU Jun,LI Xiaohui,et al.High pressure sealed digestion-determination of 50 elements in geochemical samples by inductively coupled plasma mass spectrometry[J].Physical Testing and Chemical Analysis (Part B: Chemical Analysis),2019,55(7):833-839. [8] 王君玉,吴葆存,李志伟,等.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. WANG Junyu,WU Baocun,LI Zhiwei,et al.Determination of elemental content in geological samples by one-time acid dissolution and inductively coupled plasma-mass spectrometry[J].Rock and Mineral Analysis,2011,30(4):440-445. [9] 兰明国,陆迁树,张先昌.溶样方法对电感耦合等离子体质谱法测定岩石和土壤中稀土元素的影响[J].冶金分析,2018,38(6):31-38. LAN Mingguo,LU Qianshu,ZHANG Xianchang.Influence of sample dissolution method on determination of rare earth elements in rock and soil by inductively coupled plasma mass spectrometry[J].Metallurgical Analysis,2018,38(6):31-38. [10] 王晶,黄伟雄,梁旭霞,等.土壤和海洋沉积物中16种稀土元素电感耦合等离子体-质谱测定的酸消解体系选择与消除钪元素背景干扰研究[J].环境与健康杂志,2016,33(5):448-455. WANG Jing,HUANG Weixiong,LIANG Xuxia,et al.Selection of mix-acids digestion system and elimination of background interference on scandium applied in determination of 16 rare earth elements in soil and ocean sediments by ICP-MS[J].Journal of Environment and Health,2016,33(5):448-455. [11] 杨威.微波消解-电感耦合等离子体质谱法测定金红石矿中15种稀土元素[J].当代化工,2016,45(4):824-826. YANG Wei.Determination of 15 trace rare earth elements in the rutile ore by inductively coupled plasma-mass spectrometry with microwave digestion[J].Contemporary Chemical Industry,2016,45(4):824-826. [12] 李蕾,卢燕湘,鄢韬,等.基于石墨消解微敞开体系的快速王水提取-原子荧光法测定土壤中砷和汞[J].分析试验室,2023,42(7):872-877. LI Lei,LU Yanxiang,YAN Tao,et al.Fast aqua regia extraction-atomic fluorescence spectrometry based on graphite digestion micro-open vessel for the determination of arsenic and mercury in soil[J].Chinese Journal of Analysis Laboratory,2023,42(7):872-877. [13] 文典,陈楚国,李蕾,等.微敞开体系快速全消解ICP-MS法测定土壤中总砷[J].环境化学,2020,39(8):2317-2320. WEN Dian,CHEN Chuguo,LI Lei,et.al.Determination of total arsenic in soils by semi-open full digestion coupled ICP-MS[J].Environmental Chemistry,2020,39(8):2317-2320. [14] 李蕾,苏园,陈楚国,等.微敞开体系快速石墨消解-原子荧光法测定食品及土壤中的硒[J].环境化学,2020,39(4):1098-1104. LI Lei,SU Yuan,CHEN Chuguo,et al.Fast determination of selenium in food and soils by micro-open graphite digestion-atomic fluorescence spectrometry[J].Environmental Chemistry,2020,39(4):1098-1104. [15] 徐爱平,文典,杜瑞英,等.微敞开体系快速石墨消解-ICP-OES法测定植物样品中的磷和钾[J].热带农业科学,2022,42(11):85-89. XU Aiping,WEN Dian,DU Ruiying,et al.Determination of phosphorus and potassium in plant samples by ICP-OES with micro open system rapid graphite digestion[J].Chinese Journal of Tropical Agriculture,2022,42(11):85-89. [16] 江棋,彭锦芬,陈楚国,等.微敞开体系-石墨消解-电感耦合等离子体质谱(ICP-MS)法测定稻米中8种重金属[J].中国无机分析化学,2023,13(5):407-413. JIANG Qi,PENG Jinfen,CHEN Chuguo,et al.Determination of 8 heavy metals in rice by ICP-MS with micro-open graphite digestion[J].Chinese Journal of Inorganic Analytical Chemistry,2023,13(5):407-413. [17] 吴石头,王亚平,孙德忠,等.电感耦合等离子体发射光谱法测定稀土矿石中15种稀土元素——四种前处理方法的比较[J].岩矿测试,2014,33(1):12-19. WU Shitou,WANG Yaping,SUN Dezhong,et al.Determination of 15 rare earth elements in rare earth ores by inductively coupled plasma-atomic emission spectrometry:A comparison of four different pretreatment methods[J].Rock and Mineral Analysis,2014,33(1): 12-19. [18] 中华人民共和国国土资源部. DZ/T 0279.32—2016 区域地球化学样品分析方法 第32部分:镧、铈等15个稀土元素量测定 封闭酸溶-电感耦合等离子体质谱法[S].北京:地质出版社,2016. [19] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会. GB/T 14506.30—2010 硅酸盐岩石化学分析方法 第30部分:44个元素量测定[S].北京:中国标准出版社,2010. [20] 张玉芹,彭艳,韦时宏,等.高压密闭消解-电感耦合等离子体质谱法测定地质样品中稀土元素[J].实验研究与探索,2021,40(3):29-32. ZHANG Yuqin,PENG Yan,WEI Shihong,et al.Determination of rare earth elements in geological samples by high pressure closed digestion ICP-MS[J].Research and Exploration in Laboratory,2021,40(3):29-32. [21] 贾双琳,赵平,杨刚,等.混合酸敞开或高压密闭溶样-ICPMS测定地质样品中稀土元素[J].岩矿测试,2014,33(2):186-191. JIA Shuanglin,ZHAO Ping,YANG Gang,et al.Quick determination of rare earth elements in geological samples with open acid digestion or high-pressure closed digestion by inductively coupled plasma-mass spectrometry[J].Rock and Mineral Analysis,2014,33(2):186-191.