Determination of benzoic acid in milk by solid-phase extraction and ion chromatography with conductivity detection

摘要

A simple,fast,precise and eco-friendly method,based on ion chromatography(IC) with a suppressed conductivity detector,was proposed for the determination of benzoic acid(BA) in milk in this paper.The chromatographic separation was accomplished by using an anion exchange column eluted with 3.2 mmol/L aqueous Na_2CO_3 and 1.0 mmol/L aqueous NaHCO__3 at a flow-rate of 0.7 mL/min.The method validation experiment provided excellent results with respect to linearity(correlation coefficient up to 0.9997),limit of detection(0.1μg/L),recovery values(ranging from 88.0%to 93.0%) and relative standard deviation(RSD)(below 2.2%,n = 7).