이온선택성 전극법을 이용한 조제분유중의 염소 및 요오드 이온함량 분석방법 연구

This study was carried out to develop an accurate and rapid analysis method to measure the contents of iodide and chloride in infant formula using an ion selectivity electrode. The infant formula SRM 1846 (Standard Reference Material 1846, NIST, USA) was used as a CRM (Certified reference material). Samples were dissolved in water with 3% acetic acid and filtered through filter paper and adjusted to pH 7.0 with 0.1 N NaOH. At pH 7.0, the iodide content of the CRM was 1.04±0.03 mg/kg compared to the specification of 1.11±0.1 mg/kg of CRM, and the recovery was 93.7±2.7%. The chloride content was 5114.3±240 mg/kg compared to the specification of 4,920±300 mg/kg of CRM, and the recovery was 103.9±4.90%. Ion selectivity electrodes could be successfully used to determine the concentration of iodide and chloride ions in infant formula by a simple and rapid pretreatment of sample matrixes.