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Simultaneous Removal of Lindane, Lead and Cadmium from Soils by Rhamnolipids Combined with Citric Acid.

Wan J, Meng D, Long T, Ying R, Ye M, Zhang S, Li Q, Zhou Y, Lin Y - PLoS ONE (2015)

Bottom Line: The results showed that the presence of citric acid greatly enhanced the solubilization of lindane and cadmium by rhamnolipids.The maximum desorption ratios for lindane, cadmium and lead were 85.4%, 76.4% and 28.1%, respectively, for the mixed agents containing 1% rhamnolipidsand 0.1 mol/L citric acid.Our study suggests that the combining use of rhamnolipids and citric acid is a promising alternative to simultaneously remove organochlorine pesticides and heavy metals from soils.

View Article: PubMed Central - PubMed

Affiliation: Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing, China; State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing, China.

ABSTRACT
This study investigated the performance of rhamnolipids-citric acid mixed agents in simultaneous desorption of lindane and heavy metals from soils. The capacity of the mixed agents to solubilize lindane, lead and cadmium in aqueous solution was also explored. The results showed that the presence of citric acid greatly enhanced the solubilization of lindane and cadmium by rhamnolipids. A combined effect of the mixed agents on lindane and heavy metals removal from soils was observed. The maximum desorption ratios for lindane, cadmium and lead were 85.4%, 76.4% and 28.1%, respectively, for the mixed agents containing 1% rhamnolipidsand 0.1 mol/L citric acid. The results also suggest that the removal efficiencies of lead and cadmium were strongly related to their speciations in soils, and metals in the exchangeable and carbonate forms were easier to be removed. Our study suggests that the combining use of rhamnolipids and citric acid is a promising alternative to simultaneously remove organochlorine pesticides and heavy metals from soils.

No MeSH data available.


Lindane solubilization as a function of (a) rhamnolipids and (b) citric acid concentration in the rhamnolipids-citric acid combined system.Rha denotes rhamnolipids.
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pone.0129978.g001: Lindane solubilization as a function of (a) rhamnolipids and (b) citric acid concentration in the rhamnolipids-citric acid combined system.Rha denotes rhamnolipids.

Mentions: The dissolution behaviors of lindane in rhamnolipids and citric acid alone as well as mixed solutions were investigated. Inspection of Fig 1a reveals that the solubility of lindane increased linearly as a function of rhamnolipids concentration for either individual or mixed agents. Furthermore, the differences between the three curves indicate a considerable enhancing effect of citric acid on lindane solubilization.


Simultaneous Removal of Lindane, Lead and Cadmium from Soils by Rhamnolipids Combined with Citric Acid.

Wan J, Meng D, Long T, Ying R, Ye M, Zhang S, Li Q, Zhou Y, Lin Y - PLoS ONE (2015)

Lindane solubilization as a function of (a) rhamnolipids and (b) citric acid concentration in the rhamnolipids-citric acid combined system.Rha denotes rhamnolipids.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4472516&req=5

pone.0129978.g001: Lindane solubilization as a function of (a) rhamnolipids and (b) citric acid concentration in the rhamnolipids-citric acid combined system.Rha denotes rhamnolipids.
Mentions: The dissolution behaviors of lindane in rhamnolipids and citric acid alone as well as mixed solutions were investigated. Inspection of Fig 1a reveals that the solubility of lindane increased linearly as a function of rhamnolipids concentration for either individual or mixed agents. Furthermore, the differences between the three curves indicate a considerable enhancing effect of citric acid on lindane solubilization.

Bottom Line: The results showed that the presence of citric acid greatly enhanced the solubilization of lindane and cadmium by rhamnolipids.The maximum desorption ratios for lindane, cadmium and lead were 85.4%, 76.4% and 28.1%, respectively, for the mixed agents containing 1% rhamnolipidsand 0.1 mol/L citric acid.Our study suggests that the combining use of rhamnolipids and citric acid is a promising alternative to simultaneously remove organochlorine pesticides and heavy metals from soils.

View Article: PubMed Central - PubMed

Affiliation: Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing, China; State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing, China.

ABSTRACT
This study investigated the performance of rhamnolipids-citric acid mixed agents in simultaneous desorption of lindane and heavy metals from soils. The capacity of the mixed agents to solubilize lindane, lead and cadmium in aqueous solution was also explored. The results showed that the presence of citric acid greatly enhanced the solubilization of lindane and cadmium by rhamnolipids. A combined effect of the mixed agents on lindane and heavy metals removal from soils was observed. The maximum desorption ratios for lindane, cadmium and lead were 85.4%, 76.4% and 28.1%, respectively, for the mixed agents containing 1% rhamnolipidsand 0.1 mol/L citric acid. The results also suggest that the removal efficiencies of lead and cadmium were strongly related to their speciations in soils, and metals in the exchangeable and carbonate forms were easier to be removed. Our study suggests that the combining use of rhamnolipids and citric acid is a promising alternative to simultaneously remove organochlorine pesticides and heavy metals from soils.

No MeSH data available.