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采用离子色谱模拟研究了流动相不纯对样品中无机阴离子测定造成的干扰。结果表明 ,在流动相中加入Cl-,使得其他 6种阴离子响应值增加。这主要是由于Cl-加入的同时也带来了相应的阳离子 ,在通过抑制器时可带来等量的H+ ,H+ 伴随着各个阴离子样品一起通过检测器 ,使总的样品离子响应值增加。在 6种阴离子中 ,F-和NO-2 对AS14色谱柱的亲和力和Cl-相近 ,其响应值随Cl-加入量的变化趋势相似 ;Br-,NO-3 ,PO3 -4及SO2 -4因其对色谱柱的亲和力大于Cl-,它们的响应值随Cl-加入量的变化趋势也相同。对Cl-本身 ,当流动相中Cl-加入浓度不大于样品中Cl-的浓度 (3mg·L-1)时 ,由流动相中Cl-造成的负系统峰小于样品中Cl-产生的正峰 ,其响应值基本没有变化。当流动相中Cl-浓度大于样品中Cl-浓度时 ,流动相中Cl-的负系统峰大于样品中Cl-的正峰 ,Cl-样品峰被系统峰覆盖。
Ionic chromatographic simulation was used to study the interference of mobile phase impurity on the determination of inorganic anions in samples. The results showed that the addition of Cl- in the mobile phase increased the other six anion responses. This is mainly due to the addition of Cl- with the corresponding cations and an equivalent amount of H + when passing through the suppressor, with the H + passing through the detector with each anion sample increasing the overall sample ion response. The affinity of F- and NO-2 to AS14 column was similar to that of Cl-6 in six anions. The response values of F- and NO-2 to Cl-addition were similar to those of Cl-. The Br-, NO-3, PO3-4 and SO2-4 Because of their greater affinity for the column than Cl-, their response values are the same for Cl-addition. For Cl- itself, the negative system peak due to Cl- in the mobile phase is smaller than the Cl- peak in the sample when the concentration of Cl- in the mobile phase is not greater than the concentration of Cl- in the sample (3 mg.L-1) , The response value basically no change. When the concentration of Cl- in the mobile phase is greater than the Cl- concentration in the sample, the negative peak of Cl- in the mobile phase is larger than the positive peak of Cl- in the sample and the peak of Cl- is covered by the system peak.