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多聚磷酸盐样品,用少量超纯水超声溶解,定容到100 ml,过0.22μm尼龙滤膜,取25μl试样进离子色谱分析测定其微量的氯离子含量,对离子色谱测定的条件进行了优化,该方法的氯离子在0.5~20 mg/L浓度范围内具有良好的线性关系,相关系数为0.9998。方法的最低检出浓度为0.005 mg/L,加入高、中、低三个浓度水平的氯离子测定其加标回收率在94.7%~97.5%之间。方法能简便、快速、准确测定多聚磷酸盐中微量氯离子的含量。
Polyphosphate samples, dissolved in a small amount of ultrapure water sonication, fixed to 100 ml, 0.22μm nylon membrane, taking 25μl sample into the ion chromatographic determination of trace chloride ion content, the conditions for the determination of ion chromatography The results show that the method has a good linear relationship between the concentration of chloride and the concentration of 0.5 ~ 20 mg / L, the correlation coefficient is 0.9998. The minimum detectable concentration of the method was 0.005 mg / L. The spiked recoveries ranged from 94.7% to 97.5% with the addition of chloride ion in three levels of high, medium and low concentrations. The method is simple, rapid and accurate for the determination of trace chloride in polyphosphates.