离子抑制色谱法化学镀液中4种有机酸的含量及形态分析

Quantitative Analysis of Organic Acids in Electroless Plating Solution by Ion Suppression Chromatography

离子抑制色谱法对化学镀液中4种有机酸（氨基乙酸、乳酸、乙酸、柠檬酸）进行了形态分析.样品分析仅需6 min.样品用Hypersil ODS柱分离,流动相为25mmol/L磷酸盐缓冲溶液（pH=2.1）,紫外检测波长为210 nm.4种有机酸回归方程的相关系数均在0.9994以上,线性范围为0.05×10^-3～5×10^-3g/mL,检出限分别为6 mg/L（氨基乙酸）、20 mg/L（乳酸）、14 mg/L（乙酸）、9 mg/L（柠檬酸）,加标回收率在98.12%～102.60%之间（RSD在0.31%～0.98%之间）.根据分布系数公式,结合原溶液pH值,算出了各有机酸在溶液中不同存在形态的含量.

A method for the analysis of 4 organic acids （aminoacetic acid, lactic acid, acetic acid, citric acid） in electroless plating solutions was developed. The analysis could be finished within 6 rain. It is based on an ion suppression chromatographic separation under the conditions of isocratic elution with 25 mmol/L phosphate buffer solution （pH =2. 1 ） on a Hypersil ODS column, and UV detection at 210 nm. Linear calibrations were obtained within 0. 0.05×10^-3～5×10^-3 g/mL （r 〉 0. 999 4）. The limits of detection （mg/L） were 6 of aminoacetic acid, 20 for lactic acid, 14 for acetic acid and 9 for citric acid, respectively. The average recovery rate was（n =6） 98. 12% - 102. 60%, and the relative standard deviation（n =6） 0. 31% - 0. 98%. Through the formula for distribution coefficient, and with the pH value of the original solution, the contents of different forms of each organic acid were figured out.