提出了一种简单、快速的盐析与活性炭吸附混合法,用于去除铬酸钡光度法及离子色谱法测定驱油剂中硫酸根时复杂的有机物基体干扰。考察了样品处理方法、盐种类、盐用量、活性炭用量对基体去除效果的影响。发现使用盐析与活性炭吸附混合法且盐、活性炭质量浓度分别为60,40 g·L-1时具有最佳的去除基体干扰效果。方法用于5种驱油剂样品的预处理,并与铬酸钡间接光度法及离子色谱结合用于硫酸根的测定,两种方法测定结果吻合良好。

In order to determine sulfate in deoiling agents by BaCrO4-photometry or ion chromatography, a simple and fast method for elimination of the complex organic matrix interference was proposed by the combined use of salting-out and active carbon adsorption. Optimum conditions for matrix separation were tested, including sample pretreatment methods, sort and amount of salts and active carbon used in the separation. It was found that effective separation was achieved by the combination of salting-out and active carbon adsorption. Optimum mass concentrations of salt (NaCl for photometry and NH4OAC for IC) and active carbon were found to be 60, 40 g·L-1 respectively. Contents of five samples of deoiling agents were determined by applying the proposed separation, and consistent results were obtained between photometric and IC methods.