Determining the Concentration of Trace Vanadium in Natural Saline Lake Brines
Determining the Concentration of Trace Vanadium in Natural Saline Lake Brines
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天然盐湖卤水中微量钒浓度的测定
DOI：
10.11804/nuclphysrev.39.2021054
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Bai Jing
中科院分区：
文献类型：
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作者：
Chu Jian;Huang Qinggang;Gao Ruiqin;Wang Weiping;Yin Xiaojie;Wu Xiaolei;Tian Wei;Li Sha;Qin Zhi;Bai Jing
为了测定盐湖卤水中微量钒的浓度，开发了一个钒的分离纯化流程来降低大量的共存离子的基质效应。该分离纯化流程包括萃取和反萃两个步骤。详细考察了影响钒提纯效果的因素，确定了最佳工艺条件为：在pH3.0下，用含30%D2EHPA（v/v）、20%TBP（v/v）的正己烷溶液的有机相萃取溶液中的钒30分钟，然后用3 mol/LH 2SO 4反萃10 min，对两种天然卤水样品中的痕量钒进行了预净化，用电感耦合等离子体质谱法（ICP-MS）测定了样品中痕量钒的含量。其灵敏度和检测限分别为53171 cps/（μg/L）和1.88ng/L。该方法对卤水样品的加标回收率为100%，相对标准偏差（RSD<0.6%）较小，可用于海水、盐湖卤水等复杂沃茨中痕量钒的测定。
To determine the concentration of trace vanadium in saline lake brines, a vanadium pre-purification process is established to reduce the matrix effect of the huge coexisting ions. Two steps, extraction and stripping, are included in the process. The factors affecting the vanadium purification efficiencies are investigated in detail and the optimum conditions are determined to be: vanadium in the solutions was extracted by the organic phase containing 30% D2EHPA(v/v), 20% TBP(v/v) in n-hexane for 30 min at pH 3.0, and then stripped with 3 mol/L H_2SO_4 for 10 min. Trace vanadium in two natural brine samples are pre-purified using this process and their concentrations are determined by inductively coupled plasma-mass spectrometry(ICP-MS) with sensitivity and limit of detection(LOD) for ~(51)V are 53 171 cps/(μg/L) and 1.88 ng/L, respectively. The standard addition recoveries of the brine samples are ~100% but with small relative standard deviations(RSD<0.6%), indicating that the method can be used to measure the concentration of trace vanadium in natural complicated waters, such as seawater and saline lake brines.