食品级磷酸中铁含量测定方法研究

Study of Determination Method for Iron Contents in Food Grade Phosphoric Acid

火焰原子吸收法测定元素受基体和背景以及黏稠度的影响很大，本文研究采用火焰原子吸收法测定食品级磷酸中铁的含量，并进行了精密度、准确度和检出限的测定试验，以及与工业磷酸中铁含量的测定方法和电感耦合等离子体发射光谱法比对。铁的方法线性良好，相关系数为r=0．9992；精密度高，相对标准偏差为2．75％；准确度高，回收率在95％～105％之间。试验结果表明，该法能够快速、准确地测定磷酸中铁含量，结果令人满意。

Determination of Elements by FAAS is major effect on background,matrix and consistency.This paper studied the determination method for iron contents in food grade phoshoric acid and determination experiments of precision, veracity and detection limit.It also compared to the contents of Iron in industrial phosphoric acid and ICP- AES.Linear relation of the method is good, correlation coefficient is 0.9992;high precision,relative standard deviation is 2.75%;high accuracy, recovery rate is 93%-105%.The test results revealed this method is fast and accurate to determination the contents of Iron in food grade phosphoric acid,and made the satisfactory result.