【摘要】 研究了在pH 8.5的NaB4O7-HCl缓冲溶液中,Fe(Ⅲ)催化H2O2氧化茜素红褪色的反应可被痕量EDTA有效地阻抑,被过量EDTA有效的终止,据此建立了动力学光度法测定痕量EDTA的新方法。用固定时间法在474 nm波长处检测阻抑反应。方法的线性范围为0~50.0μg/50 mL,检出限为2.2×10-6mg/mL。方法已用于罐头等食品中EDTA的测定。更多还原

【Abstract】 In NaB₄O₇-HCl solution,the catalytic action of Fe（Ⅲ）on the oxidation of alizarin red by H₂O₂ was effectively inhibited by EDTA.The reaction was effectively stopped by superfluous EDTA.The decrease in absorbance was measured at 474 nm at fixed time intervals.The linear determination range is between 0 and 50.0 μg/50 mL of EDTA.A detection limit of 2.2×10^-6 mg/mL is achieved.This method can be applied to the determination of trace EDTA in canned food with satisfactory results.更多还原