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| Determination of sulfur trioxide in isopropanol absorbent of power plant flue gas by valve switching ion chromatography |
| Received:April 29, 2021 Revised:May 18, 2021 |
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| DOI：10.3969/j.issn.2095-1035.2021.05.009 |
| KeyWord:switching valve; ion chromatography; sulfur trioxide; isopropanol |
| Author | Institution |
| zhang qin |
浙江浙能技术研究院有限公司 |
| shi yi pin |
浙江浙能技术研究院有限公司 |
| zhu sai wei |
浙江浙能技术研究院有限公司 |
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| Abstract: |
| A new method for the determination of SO3 in flue gas by ion chromatography valve switching system was established. The content of SO3 was detected by detecting content of SO42- in 80% isopropanol pre-treated samples. The SO3 in the sample was converted into SO42- by 80% isopropanol absorption solution, and the influence of high concentration of isopropanol on the determination of SO42- was removed by the online pretreatment method of valve switching. The results showed that in the linear range of 0.5-10.0 mg/L, the correlation coefficient R2 was 0.9993, the relative standard deviation was 2.67 (n=6), the detection limit was 0.7×10-2 mg/L, and the spiked recovery of the samples was 95.0%-104.7%.This method can be used for the determination of SO3 content in flue gas of coal-fired power plants. |
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