色谱2009，Vol.27Issue(6)：825-828,4.
离子色谱法测定烟气脱硫海水中的亚硫酸根离子
Determination of sulfite in flue gas desulfurization with seawater by ion chromatography
尹丽倩 1袁东星 1郭娟 1刘锡尧1
作者信息
- 1. 厦门大学环境科学研究中心,福建,厦门,361005
- 折叠
摘要
Abstract
The technology for flue gas desulfurization (FGD) with seawater is widely adopted by coal-fired power plants in coastal areas. SO_2 in the flue gas is absorbed by alkaline seawater and transfered in aqueous phase as sulfite (SO~(2-)_3) , and most SO~(2-)_3 is transformed to sulfate (SO~(2-)_4) after an aeration process. The remaining SO~(2-)_3 in the seawater discharged to sea area may be harmful to marine organism because of its biological toxicity, thus it is necessary to determine the concentration of SO~(2-)_3 in the seawater for desulfurization. In this study, the method of determination of SO~(2-)_3 in the seawater by ion chromatography was investigated. The separation was achieved on an IonPac ASH A column with 14 mmol/L NaOH-12 mmol/L Na_2CO_3 solution as the mobile phase at a flow rate of 1.2 mL/min, and the detection was performed by a pulsed amperometric detector. Formaldehyde was added as a protective agent when sampling because the SO~(2-)_3 is easy to be oxidized. To avoid the formation of Mg(OH)_2 in the mobile phase with high pH value which might block the column, the Mg~(2+) in seawater was precipitated by NaOH solution (pH 12. 0) before sample determination. The method showed good linearity within the range of 0-100 mg/L with an average recovery of 116. 8%. The meth-od detection limit ( MDL) reached as low as 0. 05 mg/L. The relative standard deviations (RSD) for seawater matrix samples spiked at levels of 7. 5, 25. 0 and 75.0 mg/L were 2. 1%, 3. 1% and 4.0% (n =9) , respectively. The method has been applied for the determination of SO~(2-)_3 in flue gas desulfurization seawater with the advantages of being fast, sensitive and selective.关键词
离子色谱法/亚硫酸根离子/烟气脱硫/海水Key words
ion chromatography (IC)/ sulfite/ flue gas desulfurization/ seawater分类
化学化工引用本文复制引用
尹丽倩,袁东星,郭娟,刘锡尧..离子色谱法测定烟气脱硫海水中的亚硫酸根离子[J].色谱,2009,27(6):825-828,4.
