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The role of nitrates in goitre genesis has been discussed for a long time. In the present report a comparative analysis is made of results obtained in villages with nitrate pollution of the drinking water. In two pairs of villages children aged between 3 and 14 were included, whose thyroid status was investigated by a clinical examination. The study was(More)
A chronic, four-month, toxicological experiment with albino rats was carried out with a view to study the effect of nitrates on organism. The animals, grouped into six groups, were daily intoxicated by probing with aqueous solution of sodium nitrate in concentrations of 30, 50, 100, 500 and 1000 mg/l. The toxicological studies established statistically(More)
The present work gives the possibility to quality the waters of Maritsa, Iskŭr, Danube, Struma, Ogosta, Yantra and Tundzha rivers according to nitrate index, on the basis of monthly investigations for a period of 10 years, after the Unified national system. The rich content of the results and the sufficient period of time give grounds to calculate and draw(More)
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