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为避免油田水中大量的氯离子对甲酸和乙酸测定的干扰 ,采用减压蒸馏的新方法来处理待测试样 ,不仅消除了氯离子的干扰 ,而且回收率较高 ,在 95 .0 %～ 97.5 %之间 .用低压离子色谱法 (LPIC)分析试样并进行了线性、精密度、回收率和干扰试验 .结果表明方法的回收率在 96.0 %～ 10 0 %之间 ,相关系数分别为0 .9998和 0 .9989,变异系数小于 1.8% ,检测限小于 0 .1μg/mL .
In order to avoid the interference of a large amount of chloride ions in oilfield water on the determination of formic acid and acetic acid, a new method of vacuum distillation is used to treat the sample to be tested, which not only eliminates the interference of chloride ions but also has a high recovery rate of 95.0% 97.5% .The samples were analyzed by low pressure ion chromatography (LPIC) and the linearity, precision, recovery and interference test were performed.The results showed that the recoveries of the method were between 96.0% and 100%, the correlation coefficients were 0 .9998 and 0 .9989, the coefficient of variation was less than 1.8%, the detection limit was less than 0.1μg / mL.