摘要
目的建立盐酸振荡浸取原子荧光光谱法测定大米中痕量镉的分析方法。方法使用体积比为1:1的盐酸溶液振荡快速浸取大米,在原子荧光光谱仪上,采用以水为载流的进样方式测定大米中的镉含量。研究优化进样方式后的记忆效应、盐酸酸度、硼氢化钾浓度、镉增敏剂用量及共存离子的影响。结果 Cu^(2+)、Pb^(2+)对镉的测定干扰较为严重, 100μg/L以上的Cu^(2+)、50μg/L以上的Pb^(2+)对镉的测定产生负干扰。以水为载流的进样方式无记忆效应,节省了酸试剂用量。方法检出限为0.75μg/kg,相对标准偏差(relative standard deviation,RSD)小于2%,样品加标回收率为91.6%~100.6%。结论该方法前处理操作简单、分析速度快、灵敏度高,适用于大米样品中痕量镉的测定。
Objective To establish a method for the determination of trace cadmium in rice by atomic fluorescence spectrometry with hydrochloric acid oscillating extraction. Methods The rice was quickly extracted by 1:1 hydrochloric acid, and cadmium in rice was determined by atomic fluorescence spectrometry with water as carrier current. The memory effect after optimizing injection mode, acidity of hydrochloric acid, concentration of potassium borohydride, dosage of cadmium sensitizer and influence of coexisting ions were studied in detail. Results The interference of Cu^(2+) and Pb^(2+) on the determination of cadmium was more serious. Cu^(2+) above 100 μg/L and Pb^(2+) above 50 μg/L had negative interference on the determination of cadmium. The injection mode with water as carrier current had no memory effect and saved the amount of acid reagent. The limit of detection cadmium was 0.75 μg/kg, the relative standard deviation(RSD) was less than 2%, and the recoveries were 91.6%-100.6%. Conclusion The method is simple, rapid and sensitive, and suitable for the determination of trace cadmium in rice samples.
作者
杨有泽
杨珍
贺攀红
马琳
孙银生
龚治湘
YANG You-Ze;YANG Zhen;HE Pan-Hong;MA Lin;SUN Yin-Sheng;GONG Zhi-Xiang(Henan Province Nuclear Industry Geology,Zhengzhou 450044,China;Henan Radionuclide Detection Center of Nuclear Industry,Zhengzhou 450044,China;Chongqing Mintai New Agricultural Science and Technology Development Group Co.,Ltd.,Chongqing 400060,China)
出处
《食品安全质量检测学报》
CAS
北大核心
2021年第3期1107-1112,共6页
Journal of Food Safety and Quality
关键词
盐酸振荡浸取
氢化物发生-原子荧光光谱法
大米
痕量
镉
hydrochloric acid oscillating leaching
hydride generation-atomic fluorescence spectrometry
rice
trace
cadmium
作者简介
杨有泽, 工程师, 主要研究方向为食品安全检测。E-mail: 407386336@qq.com;通信作者: 贺攀红, 高级工程师, 主要研究方向为光谱分析。E-mail: hepanhong1983@163.com。
