导数分光光度法测定塔河油田地层水中咪唑啉类缓蚀剂残余量  

Derivative Spectrophotometric Determination of Residual Amounts of Imidazoline Corrosion Inhibitor in Formation Water of Tahe Oil Field

作　　者：杨祖国[1,2] YANG Zuguo(Sinopec Northwest Oil Field Company,Urumqi 830011,China;Sinopec Key Laboratory of Enhanced Recovery for Fracture-cave Oil Reservoir,Urumqi 830011,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,乌鲁木齐830011 [2]中国石化缝洞型油藏提高采收率重点实验室,乌鲁木齐830011

出　　处：《理化检验（化学分册）》2020年第8期865-871,共7页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家科技重大专项(2016ZX05053)。

摘　　要：为实现油田水集输管道的缓蚀效果,保证其在最佳含量下起到缓蚀作用,有效检测缓蚀剂(咪唑啉类缓蚀剂)在地层水中的残余量,对现场缓蚀剂加注工艺的指导具有重要意义。应用紫外分光光度法测定地层水中咪唑啉类缓蚀剂时遇到了严重的背景干扰问题。为解决此阻扰,试验采用在选择扫描步长为5nm的条件下对原始紫外光谱求取二阶导数的方法。结果表明,此方法可有效消除地层水中所含其他物质对缓蚀剂在波长240nm处检测时的干扰,测得咪唑啉缓蚀剂的质量浓度在10~100mg·L^-1内与相应的紫外光谱的二阶导数呈线性关系,其检出限(3s)为0.07mg·L^-1。按标准加入法测得方法的回收率为99.7%~102%,测定值的相对标准偏差(n=6)为0.83%~6.3%。分析样品时,可根据缓蚀剂的加入量从传输管线中移取水样1L,经离心和滤纸过滤后,取滤液按仪器工作条件进行紫外分光光度测定。It was of great significance to have an effective method for the field analysis of water sample from formation water of oil field for its residual amount of imidazoline corrosion inhibitor(IMCI),in order to control the optimum amount of IMCI to be added to the piping system and to attain at a high efficiency in the anticorrosion of the piping system.UV spectrophotometry was tested for use in this case,but serious interference from the coexisting impurities in the water sample was encountered making the determination impossible.To overcome this obstacle,a scanning stepping of 5 nm was chosen,and then its 2 nd-derivate was derived.It was shown that the interference mentioned above was effectively eliminated by this method,and the absorbance of IMCI was detected at the wavelength of 240 nm.Linear relationship between values of 2 nd-derivates and the mass concentrations of IMCI was found in the range from 10 to 100 mg·L-1.Detection limit(3 s)found was 0.07 mg·L-1.Test for recovery was made by standard addition method,giving results in the range of 99.7%to 102%.Values of RSDs(n=6)found were in the range from 0.83%to 6.3%.In the analysis of unknown sample,1 Lof the water sample was taken from the piping according to the amount of IMCI added,and it was centrifuged and filtered through filtering paper,and the filtrate was analyzed by derivative UV spectrophotometry under the working condition of the instrument.

关 键 词：导数分光光度法 咪唑啉类缓蚀剂 地层水 塔河油田 

分 类 号：O657.32[理学—分析化学]