显色反应法检测双子季铵盐缓蚀剂残余浓度

Detecting Residual Concentration of Gemini Quaternary Ammonium Salt Corrosion Inhibitors by Color Reaction Method

谢 娟 王 虎 段 明 贾永福 陆 原

XIE Juan WANG Hu DUAN Ming JIA Yong-Fu LU Yuan

利用显色反应法检测油田用双子季铵盐缓蚀剂的残余浓度，以百里香酚蓝为显色剂，经过反复实验确定了最佳显色剂用量为0.4%、NH4Cl-NH3缓冲溶液用量为10 mL、显色时间为60 min，得到甲硝唑改性不对称双子季铵盐（季铵盐-01）吸光度与浓度标准曲线用于测定缓蚀剂浓度。同时，还研究了干扰离子、聚丙烯酰胺、含油量对检测结果的影响。该测试方法可靠准确性高，其平均加标回收率达到98.6%，可在油田现场进行推广。当Ca2+<4000 mg/L，Mg2+<1800 mg/L，Fe3+<1.5 mg/L时，该检测方法的误差<5%。当PAM（相对分子质量50万）浓度小于200 mg/L时，吸光度与缓蚀剂浓度仍能呈线性关系。污水中原油对检测结果的影响较大。

The residual concentration of gemini quaternary ammonium salt was determined with the color reaction method using thymol blue as color developing reagent. The optimal developing conditions was obtained as follows, the concentration of color developing reagent was 0.4%, the best dosage of buffer solution was 10 mL, and the developing time was 60 min. The standard curve of absorbance and concentration of the?gemini quaternary ammonium salt solution was obtained to determine the concentration of the ?corrosion inhibitor. In addition, the influence of interference ions, polyacrylamide, and oil on test results has been studied. Tagged recovery rate of the method could reach up to about 98.6%, which could be generalized in the oilfield. The results showed that when the concentration of Ca2+ was below 4000 mg/L, the concentration of Mg2+ was below 1800 mg/L, or the concentration of Fe3+ was below 1.5 mg/L, the error of the testing method was less than 5%. When the concentration of PAM was below 200 mg/L, the relationship of absorbance and inhibitor’s concentration was linear. The crude oil in the sewage had a great effect on the testing results.