Ali Reza Mahmoodi; Ali Tavili; Hamid Reza Boostani; Mohammad Jafari; Salman Zare
Abstract
An appropriate amount of soil was picked up from the surface horizon (0-30 cm) from the rangeland of Darab city. After air drying and passing through a 2 mm sieve, some physical and chemical properties of the soil were measured. A factorial pot experiment was conducted in a completely randomized design ...
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An appropriate amount of soil was picked up from the surface horizon (0-30 cm) from the rangeland of Darab city. After air drying and passing through a 2 mm sieve, some physical and chemical properties of the soil were measured. A factorial pot experiment was conducted in a completely randomized design with four replications. The first factor includes biochars in 7 levels (no application of biochar (C), wheat biochar (1.5 % w/w) (GB1), wheat biochar (3 % w/w) (GB2), corn biochar (1.5 % w/w) (ZB1), corn biochar (3 % w/w) (ZB2), cotton biochars (1.5 % and 3% w/w) and the second factor includes the use of lead (Pb) at 3 levels (0 (Pb0), 150 (Pb150) and 300 (Pb300) mg kg-1 soil) under forage panicum cultivation. After copmpleting vegetative growth, the plants were cutted and harvested from 0.5 cm of the soil surface. This study indicated that with increasing the biochar levels from 0 to 3 % (w/w), the electrical conductivity (0.31, 0.15 and 0.02 dS/m), soil organic carbon (53, 59 and 63%) and soil pH (0.13, 0.05 and 0.15 units) were increased and the Pb availabity (16.12, 12.83 and 10.25%) was decreased, respectively. With enhancing the Pb levels from 0 to 300 mg kg-1 soil, the concentration of soil manganese (17.27%) and potassium (4.54%) availability were significantly reduced.
sadat Feiznia; ahmad reza mokhtari; mohammad jaaferi; mohammad javad ghanei bafghi; ziba khodayian
Abstract
Mining and its various stages is one of the important factors in spreading pollution in natural environments. Contaminations may affect soil and water resources and actually enter the food chain due to absorption by plants. Among mineral elements, lead is more important because of its toxic effects. ...
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Mining and its various stages is one of the important factors in spreading pollution in natural environments. Contaminations may affect soil and water resources and actually enter the food chain due to absorption by plants. Among mineral elements, lead is more important because of its toxic effects. In order to investigate distribution of lead in downstream soils of Kushk Lead and Zinc Mine and identify anthropogenic and geogenic natures of pollution spread, a classified random systematic sampling was carried out. Sampling interval was 500 to1500 meters and soils were sampled in 0-5 and 5-30 centimeters depths. A control sample area with similar characteristics was considered in the vicinity of the region. The samples were analyzed by ICP-MASS method and the lead content of the samples was determined. Using Enrichment Factor and Geoaccumulation Index, the extension and severity of pollution are determined and related maps are prepared. Conclusions show that average amounts of lead in topsoil is about 4 times of subsoil and one kilometer far from mine, lead content of soil is more than 290 PPM that is more than permissible amounts. Moreover, the difference between lead content in topsoil and subsoil shows that the contamination in these areas is anthropogenic. Contamination reduces by going further from mine and the highest amount of emission of lead is around the main watercourse.