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Removal of Arsenic by Water Hyacinth

Pranesh Kumar Saha
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

M. Z.Asfar
Scientific Officer
Soil Science Division, BRRI Gazipur

S. Kaiser Zaman
Cheif Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

Objective of this study was to evaluate the effectiveness and suitability of water hyacinth to remove As from water. The experiment was conducted at the green house of BRRI. Water hyacinth may be used as a bioaccumulator to remove As from water. In course of time, water hyacinth was found to be more potential to remove As from the contaminated water.

Keywords: Arsenic uptake, Water hyacinth, Contaminated water

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Risk Management in Agriculture

Commodity: Arsenic

Objectives:

To evaluate the effectiveness and suitability of water hyacinth to remove As from water.

Methodology:

The experiment was conducted at the green house of BRRI. Three treatments: As0 = 0 ppm, As1= 1 ppm, and As2= 2 ppm were tested in water buckets filled with 20 L of pond water collected from the nearby pond of the BRRI, Gazipur. Initial As concentration of the pond water was determined. Stock solution of 1000 ppm As was prepared by using Na₂HAsO₄.7H₂O. Twenty ml stock solution of As was added in 3 buckets to have final concentration of 1 ppm. Again, 40 ml was poured in another 3 buckets to get ultimate concentration of 2 ppm. Prior to the addition of As solution, the equal amount of water was initially discarded from each bucket to maintain the ultimate volume of water at 20L. In the same time, 3 buckets were remained at control condition (As = 0 ppm). Then almost equal size of 14 water hyacinth samples were chosen and placed in each bucket. Water and 2 plant samples were collected at 0 hr, 2 hr, 4 hr, 1 day, 2 day, 4 day, and 7 day after the addition of As in the culture. Then the collected samples were air dried for 7 days and separated the root, leaf stalk and leaf portions of the water hyacinth. The samples were oven dried at 70⁰C for 4 days, processed and digested with tri-acid mixture for As analysis (Alam et al., 2001). Water samples and different parts of water hyacinth were analyzed by Atomic Absorption Spectrophotometer (AAS) with flow injection hydride generation system (PerkinElmer, Aanalyst-100).

Source of Information: Proceedings of BRRI Annual Internal Review for 2008- 2009

Article Link (Online Journal):

Funding Source:

1. United States Agency for International Development

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Water As concentrations were found to be decreased with time. After 2 hours the concentration was 0.744 and 1.479 ppm. The concentration reached at 0.102 and 0.729 ppm after 7 days. After 2 hours 25% and after 4 hours 32% arsenic was removed from 1 ppm solution while it was 22% and 29%, respectively from 2 ppm solution. The highest 90% As was removed from the 1 ppm solution while 61% As was removed from 2 ppm solution. The highest amount of As was absorbed in plant root and in the least amount of As in leaf. In case of 1 ppm As solution, the As conc. ranged from 0.22 to 36.61 ppm, 0.15 to 41.56 ppm and 4.51 to 484.98 ppm in the plant leaf, leaf stalk and root, respectively. In case of 2 ppm As solution, the concentration of As in plant parts were ranged from 0.17 to 42.11 ppm, 0.20 to 46.79 ppm and 4.51 to 711.13 ppm in leaf, leaf stalk and root respectively. Plant accumulated higher amount of As with increasing length of time. In case of 1 ppm As added solution, the As uptake was ranged from 0.34 to 55.82 μg, 0.36 to 95.44 μg and 11.24 to 1543.20 μg in the plant leaf, leaf stalk and root, respectively, over time. In case of 2 ppm As added solution, the uptake of As in plant parts were ranged from 0.31 to 62.05 μg, 0.50 to 101.09 μg and 10.34 to 2218.18 μg in leaf, leaf stalk and root, respectively. While in 0 ppm As added solution, it was ranged from0.21 to 0.34 μg in leaf, 0.41 to 0.59 μg in leaf-stalk and 9.50 to 16.41 μg in root.

Knowledge Management: Report/Proceedings