紫外分光光度法测定聚合物微球产出液浓度

Determination of Polymer Microspheres Concentration in the Produced Fluid by UV Spectrophotometry

聚合物微球是近几年来发展的一种新型调驱剂,为了解其注入效果实验研究了产出液中聚合物微球浓度的检测方法.目前针对聚合物微球溶液浓度的检测分析方法尚少,为了探索一种快速、简便、准确的方法,实验进行了紫外分光光度法对聚合物微球浓度测定的研究.紫外分光光度法是通过测定聚合物微球溶液中聚丙烯酰胺的含量,确定实验的最佳吸收波长和有效浓度测量范围,并根据线性回归方程计算了采出液中微球溶液的浓度.实验表明：最佳吸收波长A=230 nm;纳米球有效浓度测量范围为125 ～ 700 mg/L、核壳球有效浓度测量范围为150～ 800 mg/L;纳米球在砂管中滞留量为46.1％、核壳球在砂管中滞留量为38.68％.与色谱法、淀粉-碘化镉法和浊度法等其他测定聚丙烯酰胺含量的方法相比,紫外分光光度法具有操作简便、分析速度快、对仪器要求低、灵敏度和准确度较高等优点,适合聚合物微球产出液定性和定量的浓度测定.

As a new kind of profile control and water plugging material, polymer microspheres are widely con- cerned in recent years. In order to know its displacement effect, the test method of polymer microspheres concentra- tion in the produced fluid is studied. At present, the test method aimed at the polymer microspheres concentration is few. For the sake of obtaining a kind of concise and accurate test method, the study on testing the polymer micro- spheres concentration by ultraviolet spectrophotometry is conducted. Through determining the content of polyacryl- amide in the polymer microsphere solution and ensuring the best absorption wavelength and the effective measuring range of concentration, polymer microspheres concentration could be calculated on the basis of linear regression equation. Results from this study indicated that the specific absorptance peak appeared at 230 nm, the effective measuring range of Nano-Microspheres is 125 -700 mg/L and Core-shell Microspheres is 150 -800 mg/L, retention amount of Nano-Microspheres in the sand tube is 46. 1% and Core-shell Microspheres is 38.68%. In conclusion, with the advantages of simplicity, accurateness and low requirement for apparatus than chromatography, starch-cad- mium iodide method and turbidimetric method, UV spectrophotometry is appropriate to test the polymer micro- spheres concentration in the produced fluid.