摘要
为了建立一种快速测定小麦中微量铬的新方法,以南阳彩色小麦粉为样品,经微波程序消解后,用亚硫酸将高价铬还原为Cr3+,利用Cr3+对Luminol-H2O2化学发光体系的线性催化作用测定南阳彩色小麦中的总铬含量。结果表明:样品中的铬含量为2.211～6.088mg/kg,线性相关系数r=0.9988,对5.0×10-8mol/LCr3+测定的RSD为4.5%(n=11),按3倍标准偏差(3S)计算的检出限为3.75×10-11mol/L,灰麦加标回收率为93.66%～99.09%。该法快速简便、灵敏度高、选择性好,用于彩色小麦中微量铬的测定,结果令人满意。
In order to establish a new rapid determination method for trace chromium （Cr） in wheat flour, Nanyang color wheat was selected as sample. After the sample was treated by microwave program digestion, Crion with high valence state was deoxidized to be Cr3＋ by sulfurous acid. Based on Cr3＋ linear catalysis to Luminol-H2O2 chemiluminescence system, the total content of Cr in wheat was determined. The contents of Cr in the color wheat samples are between 2.211 mg/kg and 6.088 mg/kg. The linear correlation coefficient is 0.9988. The RSD of 5.0 × 10^-8 mol/L Cr3＋ is 4.5% （n=11）. The lowest detection limit of Cr3＋ is 3.75 × 10^-11 mol/L. The recoveries in grey wheat are in the range of 93.66% to 99.09%. This method is fast and sensitive with good selectivity. So it can be used to determine the trace in wheat with satisfactory analytical results.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2008年第8期547-549,共3页
Food Science
基金
河南省教育厅自然科学研究项目(2007550008)
关键词
微波消解
流动注射化学发光
彩色小麦
铬
microwave digestion
flow injection chemiluminescence
color wheat
chromiumin
作者简介
高向阳（1949-），男，教授、研究方向为仪器分析、食品分析。E-mail：ndgaoxy@163．com
