Determination of Rare Earth Elements in High-Salt Water by ICP-MS
After Pre-Concentration Using a Chelating Resin
ZHU Zhao-zhou1*, YANG Xin-xin1, LI Jun1, HE Hui-jun2, ZHANG Zi-jing1, YAN Wen-rui1
1. Tianjin Key Laboratory of Water Resource and Water Environment, Tianjin Normal University, Tianjin 300387, China
2. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Abstract：Based on inductively coupled plasma mass spectrometry (ICP-MS), a novel method for the accurate determination of ultra-trace rare earth elements (REEs) in high-salt surface water was established. The interfering with organic matter in the surface water was eliminated by UV/H2O2. The concentration of REEs in surface water is at the ng·L-1level, making the quantitative determination of dissolved REEs very difficult. The matrix effect of ICP-MS is serious when the total dissolved solid concentration is higher than 1 g·L-1. Moreover, nebulizer, sampler cone, and skimmer Cone may be blocked in the process of measuring. Therefore, it is necessary to remove salt from the water when the concentration of REEs in high-salt water is determined. REEs in water is needed to preconcentrate before measurement. However, the concentrations of organic matter are usually high in the surface water. The complexation of organic matter can lead to a fraction of REEs during -pre-concentration. The preconcentration of dissolved REEs is also a challenge. In this work, H2O2was added to the sample before the preconcentration. The sample was subsequently irradiated with a digester, which destroyed the organic ligands of REEs. The dissolved organic carbon (DOC) concentration in water could be reduced to approximately 0.5 mg·L-1. The REEs in water were pre-concentrated through a Nobias PA1 chelating resin column. Proceed as follows: initially, the preconcentrated system was respectively rinsed with HNO3, pure water, and NH4AC solution in sequence at a flow rate of 2.2 mL·min-1 to remove the possible residual REEs. Then, the column was respectively rinsed with NH4AC solution, sampler, and NH4AC solution in sequence at a flow rate of 2.0 mL·min-1 to preconcentrate REEs and remove the loaded salts. Finally, the REEs were eluted with HNO3 at a flow rate of 0.7 mL·min-1 and analyzed by ICP-MS. A 115In internal standard was used to correct instrument fluctuation and matrix effect. Results showed that the procedural blanks, detection limits, and relative standard deviations (RSD) of the REEs were 0.34～12.9 and 0.34～22.0 ng·L-1, and <5% (n=5), respectively, at a pH of 4.6±0.1. All REEs could be quantitative, and their recoveries were 97%～101%. The results from applying this method to coastal water, estuary water, and saline lake water showed that the recoveries of Tm internal standard were 98%～101%, and RSD of the samples (n=3) were <5%. It indicates that the method is suitable for analysing REEs in high-salt surface water.
朱兆洲，杨鑫鑫，李 军，何会军，张紫静，闫文蕊. 固相萃取-电感耦合等离子体质谱法测定地表高盐水体中的痕量稀土元素[J]. 光谱学与光谱分析, 2022, 42(06): 1862-1866.
ZHU Zhao-zhou, YANG Xin-xin, LI Jun, HE Hui-jun, ZHANG Zi-jing, YAN Wen-rui. Determination of Rare Earth Elements in High-Salt Water by ICP-MS
After Pre-Concentration Using a Chelating Resin. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(06): 1862-1866.
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