Release behavior of heavy metals from soil in ultrasound-assisted EDTA washing

2021 ◽  
Author(s):  
Sen Chen ◽  
Xiaotong Fei ◽  
Chunlei Zhang ◽  
Yin Chen ◽  
Qiuyi Ge
Keyword(s):  
Heavy Metals ◽  
Release Behavior ◽  
Ultrasound Assisted

scholarly journals Innovative Ultrasound-Assisted Approaches towards Reduction of Heavy Metals and Iodine in Macroalgal Biomass

Foods ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 649
Author(s):  
Estefanía Noriega-Fernández ◽  
Izumi Sone ◽  
Leire Astráin-Redín ◽  
Leena Prabhu ◽  
Morten Sivertsvik ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Dry Weight ◽  
The Other ◽  
Laminaria Hyperborea ◽  
Other Hand ◽  
Macroalgal Biomass ◽  
Ultrasound Assisted ◽  
I 31

The aim of this work was to evaluate the potential of ultrasound (US), alone or in combination with mild heating and/or EDTA towards reduction of As, Cd, I, and Hg content of Laminaria hyperborea. Concentrations of As, Cd, I, and Hg of 56.29, 0.596, 7340, and <0.01 mg kg−1 of dry weight, respectively, were found in L. hyperborea blades. Treatment with US at 50 °C increased approx. 2-fold the amount of As released, although did not affect significantly the content of Cd or I, as compared to control (no US) samples. Reducing the temperature to 8 °C significantly decreased the effect of US, but heating at 80 °C did not cause a significant effect as compared to treatments at 50 °C. On the other hand, treatment with 0.1 N EDTA at 50 °C enhanced the percentage of Cd released by approximately 7-fold, regardless of sonication. In the present work, the combination of US and EDTA at 50 °C for 5 min led to a significant reduction of the As (32%), Cd (52%) and I (31%) content in L. hyperborea, thus improving the product’s safety for consumers.

Ultrasound Assisted Removal of Unstable Form of Cu and Ni from Contaminated Soil

2014 ◽  
Vol 522-524 ◽  
pp. 678-681
Author(s):  
Chun Lei Zhang ◽  
A. K. Agadzi ◽  
Xiao Tong Fei ◽  
Ting Li
Keyword(s):  
Heavy Metals ◽  
Acoustic Cavitation ◽  
Polluted Soil ◽  
Test Results ◽  
High Concentration ◽  
Polluted Soils ◽  
Ultrasound Technique ◽  
Mechanical Stirring ◽  
Concentration Factors ◽  
Ultrasound Assisted

Heavy metals exist in different forms in polluted soils however only the unstable form is bioavailable and potentially threatening to the environment. This study adopted the ultrasound technique as a tool to transform the unstable heavy metal forms into soluble forms and remove them. Acoustic cavitation coupled with mechanical stirring was used to facilitate the removal of Cu and Ni from a polluted soil. Effect of sonication treating time, sonication power and slurry concentration factors on the removal efficiency (RE) were studied. Test results show that the RE increase with sonication treating time, the best RE for Cu and Ni are 40-50 minutes and 30-40 minutes respectively. Increasing the sonication power can improve the removal of Cu but particularly for Ni, the optimal sonication power is 400W. High concentration slurry is better for Cu removal but for Ni, a more dilute slurry is more effective.

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