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在硫酸介质中,Cl-、Br-和I-均对KBrO3氧化靛蓝胭脂红褪色反应有催化的作用,应用于低压离子交换色谱柱后衍生法,采用光学检测器,利用分光光度法测定原理,同时分析水样中的Cl-、Br-和I-,建立了低压离子交换色谱法同时测定Cl-、Br-和I-的新方法。Cl-、Br-和I-浓度分别在0.15～35.0 mg/L,0.03～5.0 mg/L和0.1～25.0 mg/L范围内与峰高呈良好的线性关系,Cl-、Br-和I-的方法检出限分别为11.2μg/L,2.5μg/L和26.3μg/L,精密度优于2.96%。测定矿泉水,海带汁和萝卜汁加标回收率在98.61%～105.65%之间,具有较好的重现性和准确性。
In the sulfuric acid medium, Cl-, Br- and I- are both catalyzed by the oxidation reaction of indigo carmine on KBrO3, which is applied to the low-pressure ion exchange column post-derivatization method, the optical detector is used, the principle of spectrophotometry is determined, Simultaneously analyzing Cl-, Br- and I- in water samples, a new method for the simultaneous determination of Cl-, Br- and I- by low-pressure ion exchange chromatography was established. Cl-, Br- and I- concentrations showed good linear relationship with peak height in the range of 0.15-35.0 mg / L, 0.03-5.0 mg / L and 0.1-25.0 mg / L, respectively. Cl-, Br- and I- The detection limits were 11.2μg / L, 2.5μg / L and 26.3μg / L, respectively. The precision was better than 2.96%. The determination of mineral water, kelp juice and radish juice spiked recoveries between 98.61% ~ 105.65%, with good reproducibility and accuracy.