摘要
采用硝酸-高氯酸消解食品样品,以1.0%碘化钾-1.5%酒石酸钾钠-2.0%三乙醇胺-0.6%盐酸-9.0%磷酸混合液作为底液,用单扫描极谱法对风味食品样品中痕量镉进行测定.实验表明,镉络合物于-0.71 V(相对饱和甘汞电极)处产生一灵敏催化极谱波,镉浓度在0.2 ng/mL^1μg/mL范围内与极谱峰电流有良好线性关系,检出限为0.1 ng/mL.本法简单快速、准确度高,样品加标回收率为91%~107%,相对标准偏差为1.4%~9.1%.用于风味食品样品的测定,结果满意.
Determination of trace cadmium in the taste food sample was carried out using single-sweep polarography in the supporting electrolyte solution of 1.0% KI-1.5% KNaC4H4O5-0.6% HCl-9.0% H3PO4-2.0% N （CH2CH2OH）3. The results showed that a sensitive polargraphic catalytic wave of cadnsium complex for at --0. 71 V （vs. SCE）,the peak height has a good linear relationship with cadmium concentration in the range of 0.2 ng/mL- 1 μg/mL, the detection limit was 0.1 ng/mL, the recoveries was in the range of 91%-107%, and the relative standard deviations was 1.4%-9.1%. The food sample was digested using HNO3 HClO4 solution. This method is rapid,simple and accurate, and has been used to determine trace cadmium in the taste food with satisfactory results.
出处
《广西大学学报（自然科学版）》
CAS
CSCD
2006年第3期237-240,共4页
Journal of Guangxi University（Natural Science Edition）
关键词
镉
风味食品
单扫描极谱法
cadmium
food
single-sweep polarography
