جستجوی مقالات مرتبط با کلیدواژه "edta" در نشریات گروه "محیط زیست"

Pollution caused by petroleum compounds (PAHs) and heavy metals due to their properties Cumulative and High toxicity Causing major environmental problems. These compounds, although detected in air and water, are the final and main receptive soil. Soil washing process using surfactants is a high-performance physicochemical technology for the removal of phenanthrene and cadmium from the soil environment and transferring them to the aqueous phase.

In this study, the efficiency of the process with the BBD method, with RSM, was designed to optimizing parameters such as surfactant concentration in the range 1000,1500 and 2000 mg/L, washing Time 2,12, 24 hours with L/S 10, 20 and 30 ml/g. To contaminated soil samples were added high concentrations Phenanthrene (500 mg/kg) and Cadmium (80 mg/kg), surfactant Tween 80 and EDTA.

The final concentration of Phenanthrene and Cadmium was measured by HPLC and atomic absorption spectrometry (ASS). The results showed that the efficiency of the process under optimal conditions for the separation of 76% Phenanthrene and 81% Cadmium in separate concentrations of Tween 80 and EDTA was reached in 2000 mg/L, L/S 30 ml/g (v/w), washing time 2 hours. Surfactant concentration was the most influential variable in this regard (p< 0.0001).

The separation of phenanthrene and Cadmium from the soil through the help of surfactants is an effective technique for remediation of contaminated soil.

Contaminated soil with heavy metal is one of the most important environmental issues in the world. The refining plant is one of the methods of refinement and prevent potential pollution hazards of heavy metals in soil. The purpose of this study, effects of various concentrations of EDTA on some morphological characteristics and the efficiency of EDTA for Increased Ni from soil and to compare their effects for enhancing of Ni extraction with Indian mustard (brassica juncea L). For this purpose, a greenhouse experiment was conducted in completely randomized design with four replications. Soil samples were mixed with 600 mg/kg of nickel sulfate and the seeds were planted in soil of pot. The experimental factor was including 0, 1, 5, 10 and 12 mmol EDTA that after the seed cultivation have been added to the soil. The results of the research showed that The application of different EDTA concentrations decreased morphological characteristics and increased soluble nickel concentrations in soil and transfer it to the inside of the plant and this changes was significant compared to the control treatment. The increase in soluble nickel concentrations in soil and transfer it to the inside of the plant inhibits the absorption of essential elements to the plants shoot and thus, repelled the growing process. In general, Indian mustard (brassica juncea L) due to high nickel resistance can be introduced as a Ni hyper accumulator to EDTA induced phytoextraction technology.  But according to the preventive effects of these substances on the growth of the plant should be used for low concentrations.