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采用电量法测定碱液中的Cl-含量
Determination of chloride ion content in alkaline solution using the electric quantity method
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- DOI:
- 作者:
- 张辉1 ，杜春燕2，吕鸣凤1，张晓琳3
Zhang Hui 1, Du Chunyan 2, Lv Mingfeng 1, Zhang Xiaolin 3
- 作者单位:
- 1. 中国石油兰州石化公司，甘肃兰州730060；2. 兰州三叶实业有限公司，甘肃兰州730060；3. 中国石油蓝海新材料（通州湾）有限责任公 司，江苏南通226300
1. PetroChina lanzhou Petrochemical Company, Lanzhou 730060, China; 2. Lanzhou Sanye Industrial Co., Ltd., Lanzhou 730060 China; 3. PetroChina Blue Ocean New Materials (Tongzhou Bay) Co., Ltd., Nantong 226300, China
- 关键词:
- ：烟气脱硫；碱液；Cl-；电量法
Flue gas desulfurization; Alkali liquor; Cl-; Coulometric method
- 摘要:
- 摘要：烟气脱硫装置需要测定烟气脱硫系统的碱液、脱硫塔循环液、滤清水样品中Cl-，但现有
标准在检测范围和适用性上不能满足生产需求。为了使分析检测更加准确，对生产实际起到
指导作用，采用电量法建立了适合某公司烟气脱硫装置碱液中Cl-浓度的分析方法，用标样和
样品加标回收法进行了回收率验证，回收率在100%±5% 范围内，准确度高，可检测Cl-浓度
范围为10~1 000 mg/L 内的碱液。通过对烟气脱硫装置碱液等测量结果进行重复性验证，满
足95% 概率水平要求，制定了测量结果在10~400 mg/L 范围内的重复性限值，为测量未知样品
的Cl-含量提供参考。
Abstract: The flue gas desulfurization (FGD) unit requires measuring the Cl- concentrations in the alkaline solution, circulating fluid
of the desulfurization tower, and filtered water samples in the FGD system. However, existing standards cannot meet production needs
in terms of detection range and applicability. To improve the accuracy of analysis and testing and provide guidance for practical
production, an analytical method suitable for measuring Cl- concentrations in the alkaline solution of a certain company's FGD unit
has been established using the coulometric method. Verification of the recovery rate was conducted using standard samples and
sample spiking methods, resulting in a recovery rate within the range of 100% ± 5%, indicating high accuracy. This method can
detect Cl- concentrations in alkaline solutions ranging from 10 to 1 000 mg/L. Through repetitive verification of measurement results
of the alkaline solution and other samples from the FGD unit, the requirements for a 95% probability level were met. Repeatability
limits were set for results ranging from 10 to 400 mg/L, providing a reference for measuring the Cl- content of unknown samples.