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应用分光光度法,研究了O/W型微乳液OP/n-C_5H_(11)OH/n-C_7H_(16)/H_2O与氯代1-丁基3-甲基咪唑离子液体协同作用下,孔雀绿-磷钼酸显色反应。在20℃下确定了显色反应的最大吸收波长,显色稳定时间,微乳液与离子液体的比例以及用量,硫酸、钼酸铵、孔雀绿的用量。得到的线性回归方程为y=0.180 1x-0.015 7,表观摩尔吸光系数为1.4×10~5L·mol~(-1)·cm~(-1),磷含量在0.2~6.0μg/25 m L符合比尔定律。该方法的检出限为:5.8×10~(-6)g/L。用于5种碳钢中磷含量的测定,相对标准偏差小于3%。
The effects of OP / n-C_5H_ (11) OH / n-C_7H_ (16) / H_2O and 1-butyl-3-methylimidazolium chloride ionic liquids on the micro-emulsion O / W were studied by spectrophotometry. Green - phosphomolybdic acid color reaction. The maximum absorption wavelength, color stability time, the ratio and the amount of microemulsion to ionic liquid, the amount of sulfuric acid, ammonium molybdate and malachite green were determined at 20 ℃. The linear regression equation was obtained as y = 0.180 1x-0.015 7, the apparent molar absorptivity was 1.4 × 10-5L · mol -1 · cm -1, and the phosphorus content was 0.2-6.0μg / 25 m L complies with Bill’s law. The detection limit of this method is 5.8 × 10 -6 g / L. For five kinds of carbon steel in the determination of phosphorus content, the relative standard deviation of less than 3%.