Determination of inorganic arsenic species in seaweed G. fisheri by cathodic stripping voltammetric method at hanging mercury drop electrode

Name: Charuwan Khamkaew

Organization : Songkhla Rajabaht University. Faculty of Science and Technology

Name: Lalitporn Wongsuwan

Organization : Songkhla Rajabaht University. Faculty of Science and Technology

Email : csuitcharit@gmail.com

Name: Abdullateep Sareedeh

Organization : Songkhla Rajabaht University. Faculty of Science and Technology

keyword: Seaweed G. fisheri

LCSH: Arsenic compounds -- Analysis

; Square wave cathodic stripping voltammetry

; Hanging mercury drop electrod

Abstract: A quantitative method was developed for the determination of inorganic arsenic species i.e., As(III), As(V) and inorganic As(total) in seaweed G. fisheri using square wave cathodic stripping voltammetry (SWCSV) at hanging mercury drop electrode (HMDE). The method was based on the formation of copper-arsenic intermetallic compound onto a HMDE surface at a constant potential of -0.40 V vs. Ag/AgCl in 1 M HCl with 10 mg·L-1 Cu(II) in the deposition step, followed by the reduction of deposited compound to arsine at a potential of -0.78 V in the stripping step. In the system, only As(III) was directly measured, whereas inorganic As(total) was measured by reducing As(V), which was part of inorganic As(total), to be As(III) using thiosulfate. Two values of the highest reduction efficiency obtained using concentration of 40 mg·L-1 thiosulfate, and reducing time of 300 s were 98.15% and 37.89%, respectively. In the measurement, the quantification limits of As(III) and As(total) were 0.46, and 1.62 ug·L-1, respectively. The relative standard deviation (n=10) for 2 ugL-1 As(III) and As(total) solutions were 5.20% and 2.57%, respectively. From the study, the contaminated inorganic arsenic species of As(III) (12-16 ug·L-1), As(V) (23-28 μg·L-1), and As(total) (35- 44 μg·L-1) in seaweed G. fisheri were found.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2016

Modified: 2019-10-04

Issued: 2019-10-04

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BibliograpyCitation : In Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn and Chulalongkorn University Faculty of science. Pure and Applied Chemistry International Conference (PACCON 2016) (pp.7-12). Bangkok : Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn

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