Peculiarities of assessment of content of oil products in soils Alla Okolelova, Vladimir Zheltobryukhov, Elena Nefedieva, Galina Egorova, Veronika Kaplya and Anna Merzlyakova E3S Web Conf., 161 (2020) 01100 Published online: 15 April 2020 DOI: 10.1051/e3sconf/202016101100