三元复合驱采出液中硅离子的定量分析

Quantitative Analysis of Silicon Ion in ASP-Flooding Produced Water

荆国林 唐 珊 李笑笑 汪怀远

JING Guo-Lin TANG Shan LI Xiao-Xiao WANG Huai-Yuan

将硅钼黄分光光度法用于三元复合驱采出液中硅离子的定量分析，考察了碱(NaOH)、聚合物(HPAM)、表面活性剂十二烷基苯磺酸钠(LAS)对硅离子定量分析的影响。结果表明，水样中含有的LAS（0~2400 mg/L）和NaOH（0~7200 mg/L）对硅离子的定量分析几乎无影响。高浓度NaOH(＞7200 mg/L) 对测定的影响可以用盐酸消除。在pH值为1.2、高分子量HPAM（M=3500万）加量为0~80 mg/L时，随着HPAM浓度增加，溶液吸光度增大。这一影响不能通过加入1 mL丙酮消除，但可用蒸馏水稀释消除。低分子量（M=300万）、低浓度（0~40 mg/L）聚合物几乎不影响硅离子测定。该法可准确、快速地分析三元复合驱采出液中的硅离子含量，标准曲线的线性回归方程为：A=0.0145c，相关系数R2为0.9996，线性范围0~20 mg/L，测定的准确度大于98%，相对标准偏差1.39%，重现性较好。

The silicon molybdbenum yellow method for spectrophotometry determination was applied to quantitative analyze silicon ion in ASP-flooding produced water. The effects of NaOH, polymer (HPAM) and sodium dodecylbenzene sulfonate (LAS) on quantitative analysis of silicon ions were discussed. The results showed that NaOH (0—7200 mg/L) and LAS (0—2400 mg/L) had almost no effect on the absorbance. Hydrochloric acid could be used to eliminate the influence of NaOH with high concentration (>7200 mg/L). When the pH value was 1.2 and the dosage of HPAM (M=35 million) was between 0 and 80 mg/L, solution absorbance increased with increasing concentration of HPAM. The interference of polymer on the measuring of silicon ion could not be eliminated by adding 1 mL acetone, but it could be eliminated by diluting with distilled water. The interference of polymer with low molecular weight (M=3 millon) and low concentration (0—40 mg/L) was weak. The method suggested was simple, rapid and of satisfactory precision and accuracy. The standard curve of linear regression equation was: A=0.0145c, and the correlation coefficient R2 was 0.9996. The linearity of absorbance concentration relationship maintained in the range of silicon ion concentration 0—20 mg/L. The accuracy of the method was less than 2%. The measured value of the relative standard deviation was only 1.39%, which indicated the repeatability of this method was good.