Methods of analysis for toxic elements in food products. 2. Review of USSR standards on determinations of heavy metals and arsenic.
Methods of analysis prescribed by USSR standards for Hg, Pb, Zn, As, Cd, Cu, Fe, and Sn in foods are described: for Hg--colorimetry of tetraiodide mercurate and atomic absorption spectroscopy (AAS); for Pb, Cd, Zn, and Cu--polarography; for Cu--colorimetry with sodium diethyldithiocarbamate and zinc dibenzyldithiocarbamate; for As--colorimetry with silver diethyldithiocarbamate; for Sn--colorimetry with quercetin; and for Fe--colorimetry with o-phenanthroline. All of the methods have the necessary metrological characteristics, including intralaboratory repeatability value (r), interlaboratory reproducibility value (R), minimum quantity of the element to be determined in the analytical test portion (MQSM), and the coefficients that account for mercury and arsenic losses during analysis. Establishing constant r- and R-values for the methods under consideration is expedient because (a) the methods suggested are used for safety purposes; and (b) the optimum amount of the element studied in the test sample is determined, to a certain degree, by the mass of the test portion.
Skurikhin
I M
IM
Institute of Nutrition of the USSR Academy of Medical Sciences, Moscow.
D001151:Arsenic / Q000032:analysis*; D003124:Colorimetry; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis*; D008452:Maximum Allowable Concentration; D008670:Metals / Q000032:analysis*; D011048:Polarography; D012015:Reference Standards; D014586:USSR
D008670:Metals; D001151:Arsenic