抑制型电导-离子色谱法测定地下水中碘化物

在无外来碘食物的环境下，水中碘含量是衡量人体碘摄入量的重要指标，因此准确测定饮用水中碘化物的含量对人类健康有着至关重要的作用。具有烷醇基季铵功能团的IonPac AS23色谱柱，具有较强亲水性，可在很宽的pH范围内(0~14)保持高容量，适于氢氧根淋洗液体系和碳酸根淋洗液体系，基于此，本文建立了一种抑制型电导-离子色谱法检测地下水中碘化物的方法。采用IonPac AS23型阴离子分析柱和IonPac AS23阴离子保护柱，50mmol/L的KOH淋洗液，其流速为1.2mL/min，抑制型电导检测器电流为125mA，对地下水中碘化物进行检测。该方法在8.980min出峰，方法检测限为0.5μg/L，方法标准曲线的相关性r=0.9998，线性范围较广(0.01~2mg/L)。该方法检测限更低、出峰时间更短，且不受水中7种无机阴离子的测定干扰，提高了氢氧根淋洗液体系下，烷醇基季铵功能团色谱柱AS23测定地下水中碘化物的准确度。

Determination of Iodide in Groundwater by Suppressed Conductance-Ion Chromatography

BACKGROUNDIn an environment without foreign iodine food, the iodine content of water is an important index to measure the iodine intake of the human body, so the accurate determination of iodide content in drinking water has a crucial role in human health. The detection limit of ion chromatography-amperometric detection method is generally lower than that of conductance detection method, and the sensitivity is higher. This method is suitable for the determination of trace iodide in water, but the apparent peak time is later than that of the conductance detection method. Under the same test conditions, for the ion chromatography-hydroxide eluent detection method for the determination of iodide in water, the peak time is obviously better than that of the carbonate body eluent detection method. Using carbonate eluent to analyze iodide requires adding toxic organic improvers, which is complicated, difficult to elute, has a long analysis time, high detection limit and low sensitivity.