STABILITY OF THE ELEMENT COMPOSITION OF VEGETABLE SAMPLES WITH LONG -TERM STORAGE
- Dr. Elena KHRAMOVA
- Dr. Elena KHRAMOVA (Central Siberian Botanic Garden, SB RAS)
The content and composition of the elements of vegetable samples have been first analyzed in connection with storage periods by the method of X-ray fluorescence analysis, using synchrotron radiation (SR XRF). The objects of studying were the samples of Pentaphylloides fruticosa, cultivated in the gradient of radionucleotide contamination over the territory of the East-Ural radioactive trace (EURT), formed in 1957 due to the accident at the IM “Mayak” (the town of Ozersk, Chelyabinskaya oblast) and in the conditionally “background” region of the observation area. In 2005, the samples of the P. fruticosa leaves and stems, collected in four EURT regions, were analyzed and in 2015 the same samples were analyzed after a 10-year storage period. It has been established that the element composition of the samples was almost the same. In 2005, 18 elements were discovered, and in 2015 additional two elements (Cr and Nb) were determined, probably, because of the improving potentialities of the method. The content of K, Ca, Mn, Fe, Co, Cu, Zn and Sr in the samples of 2005 and 2015 remained practically the same. As a rule, the values varied by 1 – 50% , depending on the organ and the environment. More considerable variations were observed in the content of Ti, V, Ni, As, Rb, Br, Y, Zr, Mo and Pb, which may be assigned to the increase in the relative standard deviation (%) as the measure of analysis reproducibility for these elements. In this case, as compared with 2005, in 2015 a noticeable decrease (2-4-fold) was recorded in the content of As and Br in the samples of the leaves except for those from the “background” region for which the difference was only 30-35%. Thus, the element composition of P. fruticosa, analyzed just after collection, and the element composition of that kept for 10 years, were similar. The most stable are K, Ca, Mn, Fe, Co, Cu, Zn and Sr. The tendencies to element accumulation by plants in the gradient of nucleotide pollution were preserved independent of storage period.