Removal of Lead and Arsenic Contaminated in Pom Nang Seaweed (Gracilaria fisheri) by Batch Desorption Method

Authors

  • Charuwan Khamkaew Program of Chemistry and Applied chemistry, Faculty of Science and Technology, Songkhla Rajabhat University, Muang, Songkhla Province 90000
  • Sontaya Manaboot

Abstract

In this work, the removal of contaminated lead and arsenic in Pom Nang seaweed (Gracilaria fisheri) by batch desorption was studied in order that the amounts of both metal ions could be reduced to the standard levels of the community seaweed products. In the study, a variety of food additives, i.e. acetic acid, citric acid, sodium chloride, sodium bicarbonate, EDTA, and chitosan were used as desorbing agents. To find the optimal conditions for the removal of lead and arsenic, a number of experimental parameters such as the type of desorbing agent, concentration, elution volume and elution time were varied while the speed of orbital shaking and temperature were held constant. The results showed that EDTA at the concentration of 1.0x10-1 M was the most effective desorbing agent, giving the highest desorption efficiency in removing lead and arsenic in Pom Nang seaweed up to 79.94 and 98.04%, respectively, when using the elution volume of 75 mL and the elution time of 120 min. Under such conditions, the amounts of lead and arsenic in Pom Nang seaweed were reduced from 3.19 ± 0.10 to 0.64 ± 0.08 mg/kg-dried weight and from 4.60 ± 0.15 to 0.09 ± 0.01 mg/kg-dried-weight, respectively. Keywords : lead, arsenic, Pom Nang seaweed, Gracilaria fisheri, batch desorption

Author Biography

Charuwan Khamkaew, Program of Chemistry and Applied chemistry, Faculty of Science and Technology, Songkhla Rajabhat University, Muang, Songkhla Province 90000

Faculty of Science and Technology, Songkhla Rajabhat University, 

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Published

2018-07-16