Phytoremediation of Arsenic in Mine Wastes by Acacia mangium

Abstract

This study explored the potential of Acacia mangium to remediate arsenic present in mine wastes and to determine the remediation mechanism of this plant for removing arsenic. A preliminary test using soil spiked with various arsenic concentrations showed that Acacia mangium was able to survive on arsenic‐contaminated soil with concentrations up to 500 mg kg−1 arsenic. Ex situ phytoremediation studies using mine wastes containing approximately 790 mg kg−1 arsenic also showed no toxicity effect on Acacia mangium throughout 5 months of treatment. Bioconcentration and translocation factors indicate that Acacia mangium utilizes phytostabilization as its main mechanism to uptake arsenic into the plant tissues. The use of the chemical lixiviants monoammonium phosphate and citric acid was also found to increase the translocation of arsenic from roots to stems of Acacia mangium with a 12‐ and six‐fold increase, respectively, compared with the un‐dosed plants. Further speciation analysis revealed that arsenic in the form of arsenate was the only arsenic species detected in the stems after being amended with monoammonium phosphate; thereby, suggesting a sensible strategy for more efficient targeted arsenic phytoremediation by Acacia mangium.

Effect of Ethanol Treatment on Shrinkage of Oil Palm Trunk for the Drying Process

“…The radial layer section in the oil palm trunk is characterized by the vertical plane from the pith at the center of the tree heading out towards the bark, while the tangential section is made perpendicular to the rays and tangential to the annual rings and face of the oil palm trunk (Rosli et al, 2021). On the other hand, the longitudinal section is a cut along the long axis of a structure.…”