PREPARATION AND HOMOGENEITY CHARACTERIZATION OF 10 AGRICULTURAL FOOD REFERENCE MATERIALS FOR ELEMENTAL COMPOSITION

被引:12
作者
IHNAT, M
DABEKA, RW
WOLYNETZ, MS
机构
[1] HLTH & WELF CANADA,HLTH PROTECT BRANCH,FOOD DIRECTORATE,BUR CHEM SAFETY,DIV FOOD RES,OTTAWA K1A 0L2,ONTARIO,CANADA
[2] AGR CANADA,RES BRANCH,WESTERN REG HEADQUARTERS,OTTAWA K1A 0C6,ONTARIO,CANADA
来源
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1994年 / 348卷 / 07期
关键词
D O I
10.1007/BF00325310
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Ten agricultural/food reference materials (RM): bovine muscle powder, corn starch, hard red spring wheat flour, soft winter wheat flour, whole milk powder, wheat gluten, corn bran, Durum wheat flour, whole egg powder and microcystalline cellulose, were prepared by milling, irradiation, sieving, blending and packaging procedures. Homogeneity tests for 14 elements in randomly selected units were performed by the initiating laboratories by application of various analytical methods. Al, Ca, Cu, Fe, K, Mg, Mn, Na, Sr and Zn were determined by acid digestion flame atomic absorption spectrometry, and Cd, Co, Ni and Pb using acid digestion graphite furnace atomic absorption spectrometry after separation/preconcentration of the analytes by co-precipitation. In addition, the extensive set of analytical results obtained from the interlaboratory cooperative characterization campaign was assessed to provide homogeneity estimates for other elements. Measures of homogeneity were estimated from the within-laboratory precision from the more precise laboratories. All materials exhibited acceptable homogeneity for virtually all 29 elements (Al, As, B, Ba, Br, Ca, Cd, Cl, Co, Cr, Cu, Fe, Hg, 1, K, Mg, Mn, Mo, N, Na, Ni, P, Pb, Rb, S, Se, Sr, V, Zn) for which best estimate concentration values were available, an essential pre-requisite in establishing reference values for these materials. Sixty-two percent of all homogeneity coefficients of variation (CV) were below 5%, with Br, Ca, Cl, Mg, Na, P, Zn and especially K and N exhibiting very high homogeneity CV less than 1% in some cases.
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页码:445 / 451
页数:7
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