Role of bentonite, illite, hematite, zeolite, and calcite in decreasing of heavy metals adsorption by polluted wastewater in Tabriz city
Subject Areas :رامین Salmasi 1 , Mansooreh Mahdavi 2 , Alireza Ostadrahimi 3
1 - استادیار مرکز تحقیقات کشاورزی و منابع طبیعی آذربایجان شرقی
2 - دانش آموخته کارشناسی ارشد زمین شناسی اقتصادی دانشگاه آزاد اسلامی واحد علوم تحقیقات تهران
3 - دانشیار مرکز تحقیقات تغذیه دانشگاه علوم پزشکی تبریز
Keywords: Heavy metals, soil, Amendments, plants,
Abstract :
Heavy metals fixation in-situ by using inorganic amendments , is a method for remediation of pollutedsoils. The goal of this research is to determine 5 kinds of amendments feeiciency for heavy metals fixationof waste-water-irrigated soils in around of Tabriz city and to suggeste the best amendment/amendments.solutions containing CD, Pb< Cu, Ni, and Zn were added to 0.5 gram of 5 amendments including calcite,hematite, zeolite, illite, and bentonite; and 10 soil samples from around of Tabriz city. After shaking, these5 element concentrations were determined in filtered solution by using atomic absorption instrument.Retention capacity percentages of these elements were ca;culated and by using dankan method, the bestamendments were determined. There were sharp differnences of heavy metals retention betweenamendments. Calcite had the highest retention of Cd, ni, and Zn; hematite the highest one of Cu and Pb;and the least one was for ilite. Calciye, zeolite, bentonite, and hematite had significant (in 5 % level) higherretention capacities of Cd, Ni, and Zn in compared to 10 the soil samples. The highest retention capacitieswas done by calcite and hematite (without significant differences) for Pb. Calcite hematite, and zeolite hadthe highest retention of Cu. However, the highest retention was done by illite with significant differencewith other 2 amendments. The retention capacities of calcite and hematite amendments for the 5 elementswere higher than all 10 the soil samples in 5 % level and can cause low uptake and accumulation of theseelements in agricultural crops of polluted soils of around of Tabriz city
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