Arsenate Adsorption Optimization

A stock solution of arsenate (100 ppm) was prepared by dissolving the required amount of Na₂HAsO₄ in deionized water. It was then diluted to the desired concentration. The effect of pH for arsenic adsorption was investigated in between pH 2 and 9 using a 50 ppm of initial As(V) solution. The optimum contact time for As(V) adsorption was determined using 20.0 ml aliquots of arsenate solutions having 50 ppm concentration, pH of 5.5 and 0.04 g of adsorbent. Batch adsorption studies for arsenate were carried out using the same conditions in between 4 and 50 ppm of As(V) concentration range. The residual arsenic concentrations were measured using a GBC 932 AB graphite furnace atomic adsorption spectrometer (AAS).

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Shanika Fernando M., Wimalasiri A.K., Dziemidowicz K., Williams G.R., Rasika Koswattage K., Dissanayake D.P., Nalin De Silva K.M, & De Silva R.M. (2023). The blending effect of natural polysaccharides with nano-zirconia towards the removal of fluoride and arsenate from water. Royal Society Open Science, 10(3), 221514.

Publication 2023

Adsorption Arsenate Arsenic Graphite

Corresponding Organization : University of Colombo

Other organizations : University College London, Sabaragamuwa University of Sri Lanka

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Variable analysis

independent variables

PH (between 2 and 9)
Contact time (optimum determined)
Arsenate (As(V)) concentration (between 4 and 50 ppm)

dependent variables

Arsenic adsorption
Residual arsenic concentration (measured using GBC 932 AB graphite furnace atomic adsorption spectrometer)

control variables

Initial arsenate (As(V)) concentration (50 ppm)
Solution volume (20.0 ml aliquots)
Adsorbent amount (0.04 g)
PH (5.5)

positive controls

None mentioned

negative controls

None mentioned

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