TOXIC ELEMENTS CONTENT ANALYSIS OF BLOOD AND MILK OF COWS

Abstract

Currently, one of the main economic policies of the Russian Federation in the field of food security is production of safe food and consumer protection. The aim of the research was to study the content of such toxic elements as Zn, Cd and Pb in milk and blood of cows. Experimental studies were carried out at stud farms Plemzavod Tayozhny LLC in Suhobuzimsky District and OPH Solyanskoe LLC in Rybinsk District, Krasnoyarsk Krai, Russian Federation. The milksamples were studied by atomic absorption method; the blood serum samples, by mass spectrometry. Blood serum samples were obtained by sedimentation of whole blood and retraction of the blood clot followed by centrifugation. The obtained data were processed by the method of variation statistics with the calculation of statistical indicators. The lowest contents of Zn, Cd and Pb were found in blood serum of the cows of OPH Solyanskoe LLC; it was 0.038, 0.001, and 0.002 mg/l, respectively. The milk samplescollected at Plemzavod Tayozhny LLCcontained less heavy metals than those collected at OPH Solyanskoe LLC: Zn by 2.069 mg/l, Cd by 0.01 mg/l, and Pb by 0.061 mg/l (P>0.999). When calculating the correlation coefficients, weak positive and negative correlationswere established between Zn and Pb content in blood and milk. The detected amounts of toxic elements did not exceed the maximum permissible concentrations, except for Pb content in milk sampled at OPH Solyanskoe LLC, which was higher than the standard content by 0.026 mg/l.