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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Measurement of Manganese in Foods by Instrumental Neutron Activation Analysis

2011년 8월 4일 18시 12분 06초
Ⅳ-ANAL.P-221 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
김인중, 임용현1, 황의진1
한국표준과학연구원 삶의질측정표준본부, Korea
1한국표준과학연구원 분석화학표준센터, Korea
Manganese is an essential trace element. It is involved in the formation of bone frame and in protein, fat, and carbohydrate metabolism. The dietary reference intake for an adult (male) is 2.3 mg and the tolerable upper intake level is 11 mg. Deficiency might cause impaired growth, skeletal defects, weight loss, defects in metabolism, depressed reproductive function and so on. Manganese poisoning can be happen to a person with cholestatic liver disease or a person receiving total parenteral nutrition. Accumulation of manganese over time can lead to severe psychiatric disorders and permanent neurological malfunction. Manganese is a mono-isotopic element. Hence, it is not possible to apply ID-ICP/MS (Isotope-Dilution Inductively Coupled Plasma Mass Spectrometry) for the measurement of manganese. ID-ICP/MS is a well known primary method for the measurement of elements, but it is limited only to the elements which have more than two stable isotopes. INAA (Instrumental Neutron Activation Analysis) is also known as a primary method for the determination of elements. INAA has no restriction on mono-isotopic elements. So it can be used for a complementary primary method with ID-ICP/MS for the determination of elements in various matrices. INAA is non-destructive (no sample preparation), not affected by the chemical and physical state of the element of interest. And it is very sensitive to manganese. The detection limit at the INAA neutron irradiation facility of the HANARO is as low as 1 pg. In this study, four kinds of food matrix samples (oyster tissue, soybean powder, rice flour, tea leaves) were analyzed. NIST SRM 1566b was selected for oyster tissue and some CRM (Certified Reference Materials) candidate materials manufactured by KRISS and NMIJ (National Metrology Institute of Japan) were used for other matrix samples. All the uncertainty components which might cause bias to the measurement were studied and the effects were evaluated. INAA showed good agreement with the certified value or the results from other methods. The results and their uncertainties related to the measurements are discussed.