Optimization of arsenic phytoremediation using Eichhornia crassipes

International Journal of Phytoremediation
Tamara Daiane de SouzaAmanda Fernandes Braga

Abstract

This study aimed to evaluate the pH, phosphate, and nitrate in the process of arsenic absorption by Eichhornia crassipes (water hyacinth), using the surface response methodology, in order to optimize the process. The plants were exposed to a concentration of arsenic of 0.5 mg L-1 (NaAsO2) over a period of 10 days. The results indicated optimal levels for the absorption of arsenic by E. crassipes at pH equal to 7.5, absence of phosphate, and minimum nitrate level of 0.0887 mmol L-1. For the tested concentration, E. crassipes was able to accumulate 498.4 mg kg-1 of As (dry base) in its plant tissue and to reduce 83% of the initial concentration present in the aqueous medium where it was cultivated. The concentration of phosphorus in solution linearly increased the phosphorus content in the plants and negatively influenced the absorption of arsenic. The concentration of 0.5 mg L-1 of As did not significantly affect the relative growth rate (RGR) and the tolerance index (TI). 94% of As (III) initially solubilized in water was converted by the end of the experiment period into As (V). The water hyacinth was important in the phytoremediation of arsenic when cultivated under optimal conditions for its removal.

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Citations

Feb 16, 2021·Environmental Science and Pollution Research International·Sana IrshadQaisar Mahmood
May 16, 2021·Bulletin of Environmental Contamination and Toxicology·Shaikh Md Mahady HasanMd Atikul Islam
Jun 21, 2021·Chemosphere·Aditi Shreeya Bali, Gagan Preet Singh Sidhu

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Methods Mentioned

BETA
atomic fluorescence spectrometry

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