Abstract
The dynamics of the consequences of the Proton-M carrier rocket crash on the soil and vegetation cover in the area where its parts fell were studied in 2007-2014.Analytical methods such as liquid chromatography with electrochemical and spectrophotometric detection were used.In 2007, four soil detoxifications were performed.A second study in 2009 showed a sharp increase in the area of contamination of plants by UDMH (unsymmetrical dimethylhydrazine) and NDMA (N-Nitrosodimethylamine).In 2010, the situation shifted in the opposite direction.Toxicants in plants were absent for three years (2010-2012) but reappeared in 2013 and 2014.The accidental crash of the Proton-M carrier rocket led to the destruction of the soil and vegetation cover, ignition of vegetation, and soil contamination.In the area where the rocket parts fell, the UDMH content in the soil was 1.4-5,200 times higher than the threshold limit value.The fall of the carrier rocket increased the area of soil contamination with UDMH to 3,600 m 2 , with NDMA to 917 m 2 , and with nitrate ions to 8,314 m 2 .The reappearance of heptyl and nitrous compounds in plants and soil was detected four years after repeated detoxification of the soil.