| 摘要: |
| 氯离子和硫酸根离子是海水中重要的无机阴离子，在研究海洋生态变化、海洋循环作用过程与海洋全球气候变化等领域具有重要的指示意义。其测定方法较多，但缺少相应的测试方法。本文对测定海水中Cl-，SO42-的离子色谱方法进行了优化，选用IonPacAS14碳酸盐选择性离子色谱柱，以3.5 mmol/L Na2CO3+1 mmol/L NaHCO3为流动相，可消除海水样品中碳酸盐及其他阴离子的干扰。该方法对Cl-检出限为0.29 mg/L，线性相关系数r2=0.999 2，对SO42-检出限为0.42 mg/L，线性相关系数r2=0.997 9。样品的加标回收率在95%~102%，Cl-和SO42-的相对标准偏差分别为1.92%和4.18%。该方法简便、迅速、灵敏、准确度高，可满足批量海水样品中Cl-与SO42-的准确测试。 |
| 关键词: 离子色谱法 海水 氯离子 硫酸根离子 |
| DOI：10.11759/hykx20191119001 |
| 分类号:X832 |
| 基金项目: |
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| Determination of chloride and sulfate ion in seawater by ion chromatograph |
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WANG Pi-bo1, ZENG Yan-min1, YAN Jing1, YIN Li-na1, REN Deng-long2
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1.North China Sea Bureau of Ministry of Natural Resources, Qingdao 266100, China;2.China Petroleum and Chemical Corporation, Dongying 257237, China
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| Abstract: |
| Chloride ions and sulfate ions are important inorganic anions in seawater, and are of great significance for studying changes in marine ecology, processes of ocean circulation and changes in global ocean climate. There are many measurement methods, but the lack of corresponding test methods. In this paper, the ion chromatography method for the determination of Cl- and SO42- in seawater was optimized. IonPacAS14 carbonate selective ion chromatographic column was selected, with 3.5 mmol/L Na2CO3+1 mmol/L NaHCO3 as the mobile phase, which can eliminate the interference of carbonate and other anions in seawater samples. The detection limit of Cl- was 0.29 mg/L with good linearity r2=0.999 2, and the detection limit of SO42- was 0.42 mg/L with linearity r2=0.997 9. The recovery of the samples was between 95% and 102%. The relative standard deviations (RSD) of Cl- and SO42- were 1.92% and 4.18%, respectively. This method is simple, rapid, sensitive, and highly accurate, and it can meet the accurate test of Cl- and SO42- in batches of seawater samples. |
| Key words: ion chromatograph seawater chloride ion sulfate ion |
