钨丝捕获-电热蒸发原子荧光光谱法直接测定饮料中痕量镉

doi:10.7506/spkx1002-6630-201324027

食品科学

钨丝捕获-电热蒸发原子荧光光谱法直接测定饮料中痕量镉

王金玉，黄亚涛，毛雪飞，王敏，焦必宁，张英

1.中国农业科学院农业质量标准与检测技术研究所，农业部农产品质量安全重点实验室，北京 100081；
2.中国饮料工业协会，北京 100027；3.中国农业科学院柑桔研究所，重庆 400712

出版日期:2013-12-25 发布日期:2014-01-03

direct sampling；tungsten coil trapping；electrothermal vaporization (ETV)；atomic fluorescence spectrometry (AFS)；beverages；ultra-trace cadmium

WANG Jin-yu，HUANG Ya-tao，MAO Xue-fei，WANG Min，JIAO Bi-ning，ZHANG Ying

1. Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture, Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, Beijing 100081, China；
2. China Beverage Industry Association, Beijing 100027, China；
3. Citrus Research Institute, Chinese Academy of Agricultural Sciences, Chongqing 400712, China

Online:2013-12-25 Published:2014-01-03

摘要/Abstract

摘要：

利用钨丝特异性捕获镉(Cd)消除基体干扰，泡沫碳材质电热蒸发器串联原子荧光光谱仪，建立直接进样测定饮料痕量Cd的方法。仪器条件为：泡沫碳材质样品舟进样(10μL)，采用灰化(矿泉水100W保持30s，其他饮料基质100W保持50s)与蒸发(70W保持30s)过程分离，Ar-H2(9:1)载气流速为600mL/min。结果表明：方法具有良好的线性，线性范围为0～5ng，相关系数r在0.998以上；10种饮料产品的加标回收率为92.2%～111.8%；方法检出限为0.04μg/L，相对标准偏差(RSD)在10%以内。本方法简单、灵敏、快速(包括样品前处理的分析时间不超过3min)，适用于饮料产品痕量Cd的现场快速检测。

关键词: 直接进样, 钨丝捕获, 电热蒸发, 原子荧光光谱, 饮料, 痕量镉

Abstract:

A novel direct sampling method to determine cadmium in beverages by solid sampling electrothermal
vaporization atomic fluorescence spectrometry (SS-ETV-AFS) was established, where a tungsten coil as a Cd trap was used
to remove matrix interferences and foam graphite as an electrothermal vaporizer and a sample boat. In the present
study, 10 μL sample was loaded onto a sample boat, and then vaporized with 70 W for 30 s after being ashed
wi th 100 W for 30 s (natural spring water) or 50 s (beverages), using Ar/H2 (9:1) as the carrier gas with a flow
rate of 600 mL/min. Results showed that the calibration curve for Cd had good linearity (from 0 to 5 ng), and a correlation
coefficient (r) was more than 0.998; the recovery rates for Cd in 10 kinds of beverages were 92.2%-111.8%. The detection
limit was 0.04 μg/L, and the relative standard deviations (RSD) were less than 10%. This method is simple, sensitive,
fast (the whole analytical process including sample pretreatment can be completed within 3 min) and suitable for in-field
determination of ultra-trace amounts of Cd in beverages.

Key words: direct sampling, tungsten coil trapping, electrothermal vaporization (ETV), atomic fluorescence spectrometry (AFS), beverages, ultra-trace cadmium

王金玉，黄亚涛，毛雪飞，王敏，焦必宁，张英. 钨丝捕获-电热蒸发原子荧光光谱法直接测定饮料中痕量镉[J]. 食品科学, doi: 10.7506/spkx1002-6630-201324027.

WANG Jin-yu，HUANG Ya-tao，MAO Xue-fei，WANG Min，JIAO Bi-ning，ZHANG Ying. direct sampling；tungsten coil trapping；electrothermal vaporization (ETV)；atomic fluorescence spectrometry (AFS)；beverages；ultra-trace cadmium[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201324027.

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钨丝捕获-电热蒸发原子荧光光谱法直接测定饮料中痕量镉

direct sampling；tungsten coil trapping；electrothermal vaporization (ETV)；atomic fluorescence spectrometry (AFS)；beverages；ultra-trace cadmium

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