论文部分内容阅读
Urban landscapes soils technogenic pollution research has been carried out in the areas affected by petrol stations.The soils were under study in regard of heavy metals,petrochemical products content and soil media reaction.Active acidity (pH) of the researched soils has been determined,the average value amounted 7,41 and maximum value amounted 8,18.The research results revealed,that the upper soil horizon of neighboring petrol stations differs from the lower horizon in high alkalinity proving their technogenic pollution.The concentration of heavy metals mobile forms was detected by atom-absorption analysis method.Higher copper concentration in the upper horizon has been registered and,on the whole,standard copper concentration excess in all upper horizons appeared to be approximately twice higher,and maximum concentration was 23,5,that comprised 8 maximum permissible concentration (MPC).Zinc content analysis of the researched soils revealed MPC excess by 2-3 times in all the studied objects,and in some objects zinc maximum concentration comprised 5-10 MPC.High element concentrations in the lower horizons testify of the constant and long-lasting pollution source.Thus we can speak of the existing threat for further pollution increase.Lead content analysis in the researched objects has not revealed the pronounced consistency between element migration in the soil and soil solution reaction.In general,lead content in the soils under study is not high but for some objects,where high lead content,multiple 2,3-4,5-6 MPC,has been revealed.Main pollutants at petrol station beside HM are petrochemical products.Petrochemical products content in the researched soils fluctuated within the limits from 0,04 mg/g to 4,961 mg/g of soil.The increased petrochemical products concentrations have been detected in the soils at all petrol stations,and maximum content has been revealed at petrol stations working for a long time (over 30 years),that proves of high technogenic load.The research works demonstrate that for soil cover condition assessment it is necessary to allow for petrochemical products and heavy metals pollution from petroleum stations,and thus to treat and recultivate such soils opportunely and to provide preventive measures.