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Research articles

ScienceAsia 42(2016): 266-274 |doi: 10.2306/scienceasia1513-1874.2016.42.266

Flow injection–differential pulse anodic stripping voltammetry to measure As(III) and As(V) in natural water samples

Supunnee Duangthonga,*, Amornrat Suwaninb, Pipat Chootoa, Chalermpol Innuphata

ABSTRACT:     Flow injection-differential pulse anodic stripping voltammetry (FI-DPASV) for As(III) and As(V) determination at parts-per-billion (ppb) level was developed with gold film coated glassy carbon as a working electrode. As(III) was determined first by FI-DPASV. Then, As(total) was determined by reducing As(V) to As(III) using 6.5 mM KI for 45 min, and As(V) was quantified as the difference. Parameters for the pre-plated gold film electrode in As(III) and As(V) determination were optimized to obtain linear calibration graphs in the range of 1.0–30 µg/l and 2.0–100 µg/l for As(III) and As(total), respectively. The limits of detection (based on 3 Sy/x/m) of 0.81 µg/l As(III) and 2.03 µg/l As(total) were obtained with a precision within 4% (at 2 and 20 µg/l, n=10) for As(III) and within 6% (at 10 and 100 µg/l, n=10) for As(total). Analysis of the Standard Reference Material 1640 natural water standard with the certified value of 26.67±0.41 µg/l yielded total arsenic concentration of 25.2±0.7 µg/l (n=3). For cations commonly found in natural water, Sb(III) was found to interfere with As(III) analysis whereas Hg(II) and Cu(II) interfere with As(total) determination. The developed method was successfully applied to natural water samples collected from arsenic contaminated areas in Ron Phibun Subdistrict, Ron Phibun District, Nakhon Si Thammarat Province in Thailand. The recoveries of the method by spiking were in the range of 85–105%. The results of As(total) in natural water samples analysed by the developed method (FI-DPASV) were in good agreement with those obtained by inductively coupled plasma-optical emission spectrometry.

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a Department of Chemistry, Analytical Chemistry Division, Faculty of Science, Prince of Songkla University, Hatyai, Songkhla 90112 Thailand
b Lamae Wittaya School, Lamae Sub District, Lamae, Chumphon 86170 Thailand

* Corresponding author, E-mail: supunnee.d@psu.ac.th

Received 18 Oct 2014, Accepted 1 Jul 2016