离子色谱法测定天然气中H2S含量

Determination of hydrogen sulfide content in natural gas by ion chromatography

关键词:  H₂S  天然气  离子色谱 

Key words:  hydrogen sulfide  natural gas  ion chromatography

摘要:

建立了一种用离子色谱测定天然气中H₂S含量的新方法。该方法将天然气中H₂S通过碱液吸收,过氧化氢氧化为硫酸根离子,用离子色谱仪对溶液中的硫酸根离子浓度进行测定,进而计算出天然气中H₂S含量。在H₂S质量浓度为0.60~30 mg/m³之间的峰面积与质量浓度呈线性关系,相关系数为0.999 8。方法 检出限为0.11 mg/m³。对H₂S质量浓度为1.52 mg/m³的天然气标准气体进行10次测定,相对标准偏差为3.14%。对3个H₂S质量浓度分别为1.52 mg/m³、3.04 mg/m³和9.13 mg/m³的天然气标准气体进行测定,相对误差均小于5%。 

Abstract:

A new method was established in which the content of hydrogen sulfide in natural gas was determined by ion chromatography. In this method, hydrogen sulfide in natural gas was absorbed by alkali solution, hydrogen peroxide was oxidized to sulfuric acid ion which was determined by ion chromatography for calculating the content of hydrogen sulfide in natural gas. A good linear relationship was presented between the chromatographic peak area and concentration of hydrogen sulfide in the range of 0.60~30 mg/m³, and the correlation coefficient is 0.999 8. The detection limit of the method was 0.11 mg/m³. For the natural gas reference gas with concentration of 1.52 mg/m³, the relative standard deviation of results in 10 times was 3.14%, for three kinds of natural gas reference gases with concentration of 1.52 mg/m³,3.04 mg/m³ and 9.13 mg/m³ respectively, their relative errors were less than 5%.