Korean J Vet Res > Volume 52(2); 2012 > Article
Korean Journal of Veterinary Research 2012;52(2):69-74.
DOI: https://doi.org/10.14405/kjvr.2012.52.2.069    Published online June 30, 2012.
Method and proficiency test for analysis of toxic metals in livestock products by ICP/MS
Jung-Hee Jang, Dong-Gyu Kim, Hyun-Jeong Kwon, Chae-Mi Lim, Seong-Wan Son, MeeKyung Kim
Animal, Plant and Fisheries Quarantine and Inspection Agency
ICP/MS를 이용한 축산물의 유해중금속 분석방법 및 숙련도 검증
장정희, 김동규, 권현정, 임채미, 손성완, 김미경
The analytical method of trace toxic metals in livestock products was confirmed and validated through certified reference material (CRM) and the international proficiency tests. There are some difficulties to determine low levels of toxic metals in livestock products because of interferences due to the matrix. The recoveries of CRM (NIST 1577c) ranged from 73.9 to 119% for lead and from 86.4 to 111% for cadmium in bovine liver. The international proficiency tests were carried out with the milk powder and cocoa powder samples including metals provided by Food Analysis Performance Assessment Scheme (FAPAS$^{(R)}$, UK). The test samples were prepared by microwave digestion using solution of $HNO_3:H_2O_2:H_2O$ (v/v/v = 5 : 2 : 4) and analyzed by ICP/MS. The analytical result of cadmium in milk powder was $121{mu}g/kg$ with -0.3 of the z-score compared to the assigned value of $131{mu}g/kg$ by FAPAS$^{(R)}$. The analytical results of lead and cadmium in cocoa powder were $29.2{mu}g/kg$ and $97.6{mu}g/kg$, respectively, which satisfied the assigned values of $34.2{mu}g/kg$ for lead and $126{mu}g/kg$ for cadmium by FAPAS$^{(R)}$. It is verified that the analytical method is accurate and reliable to determine trace lead and cadmium in livestock products by microwave digestion and ICP/MS.
Key Words: cadmium, ICP/MS, lead, livestock product, microwave digestion
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