方波伏安法检测酱油和食盐中乙二胺四乙酸铁钠

摘要

采用方波伏安法建立乙二胺四乙酸铁钠（NaFeEDTA）的检测方法。用pH值为3.0的磷酸缓冲溶液作为底液;电化学条件为扫描增量10mV、方波频率2.5kHz、方波振幅100mV,可实现对NaFeEDTA的检测。试液中NaFeEDTA的质量浓度在10～200mg/L范围内,标准曲线相关系数为0.9997,检出限为4mg/L。对铁强化酱油和食盐中的NaFeEDTA检测的回收率为（93.5±2.1）%和（96.8±2.8）%。%Square wave voltammetry was established to determine sodium iron EDTA（NaFeEDTA）.In the square wave voltammetry,the phosphate buffer solution（pH 3.0） was set as the base solution,scan increment was set for 10 mV,square wave frequency was set at 2.5 kHz,and square wave amplitude was set at 100 mV.The linear range for the determination of NaFeEDTA was 10-200 mg/L with the correlation coefficient of 0.9997.The limit of detection of NaFeEDTA was 4 mg/L.In iron fortified soy sauce and salt samples,the recoveries were（93.5 ± 2.1）% and（96.8 ± 2.8）%.