摘要
建立了一种基于聚乙烯亚胺(PEI)溶液的紫外(UV)吸收光谱检测油气田硫化氢(H2S)气体浓度的方法。利用PEI结构中的氨基可与H2S气体反应的特性,测定通入H2S气体前后PEI溶液的UV吸收光谱,并分析了UV光谱吸收峰在230、365 nm附近的吸光度变化与气体浓度的关系。采用标准浓度的H2S气体样品进行浓度标定实验,建立了H2S气体浓度与吸光度之间的关系模型。实验结果表明:通入高纯度H2S气体时,PEI溶液的UV光谱在230 nm和365 nm处均出现较强吸收峰;通入较低浓度H2S气体时,UV光谱只在230 nm处出现吸收峰,该吸收峰附近的吸光度与H2S气体浓度间存在线性关系(相关系数为0.970 6),系统对H2S气体浓度的检出限可达15.39 mg/m3。基于PEI溶液的UV吸收光谱检测法可为油气田H2S气体浓度的快速、准确测定提供参考。
A method based on UV absorption spectroscopy with polyethylenimine（ PEI） solution was proposed for the rapid and accurate detection of H2 S gas in oil and gas fields. The amino groups in PEI reacted with H2 S gas while it was bubbled into PEI solution,which could be utilized in the detection of H2 S concentration. The UV absorption spectra of PEI solution were measured before and after bubbling H2 S gas,and the absorbance near absorption line 230 nm and 365 nm of UV absorption spectra was analyzed. H2 S gas samples with standard concentration were prepared for concentration calibration tests,and the relationship between gas concentration and UV absorbance was studied.The experimental results showed that a good linear relationship between H2 S gas concentration and UV absorbance of PEI solution was obtained,with a correlation coefficient（ r2） of 0. 970 6. Meanwhile,the limit of detection for H2 S gas reached to 15. 39 mg/m3. UV absorbance analysis on PEI solution could be used for the rapid determination of H2 S gas in oil and gas fields.
作者
唐东林
张琪
柯志军
王瞧
TANG Dong-lin;ZHANGQi;KEZhi- jun;WANGQiao(Key Laboratory of Petroleum - Gas Equipments of Education Ministry,College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《分析测试学报》
CAS
CSCD
北大核心
2018年第6期749-753,共5页
Journal of Instrumental Analysis
基金
国家自然科学基金资助项目(41474142)
关键词
聚乙烯亚胺
紫外吸收光谱
硫化氢气体
有机聚合物
精确测量
polyethylenimine
ultraviolet absorption spectrum
hydrogen sulfide
organic polymer
accurate measurement
作者简介
通讯作者：唐东林,博士,研究方向：无损检测与光纤传感技术,Tel：13540750023,E-mail：tdl840451816@163.cm
