Detection tube method for trace level arsenic. Issue 1 (March 2015)

• Record Type: Journal Article
• Authors: Kiso, Yoshiaki; Asaoka, Satoshi; Kamimoto, Yuki; Tanimoto, Seiya; Yokota, Kuriko
• Is Part Of: Journal of environmental chemical engineering. Volume 3:Issue 1(2015:Mar.)
• Page Start: 40
• Page End: 45
• Publication Date: 2015-03
• Subjects: Arsenic -- Spot test -- Detection tube -- Molybdenum blue -- WHO guide line; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2014.11.017
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: The color band length was correlated almost linearly with the arsenic concentration in the range of 0.01–0.1 mg L −1 . Highlights: The detection tube method enabled visual determination of As(V), at 0.01 mg As L −1 . The color development was conducted by a modified molybdenum blue method. As(III) was also detected at 0.01 mg As L −1 by this method after oxidation to As(V). Abstract: Arsenic pollution of surface and ground waters has been reported in many developing countries, and it is therefore an important task to detect arsenic rapidly using a simple and inexpensive tool. This work focused on the detection of arsenic at 0.01 mg As L −1 by visual determination. A small column packed with the poly(vinylchloride) particles coated with a quaternary ammonium salt was used as a detection tube. Molybdoarsenic heteropoly acid (molybdenum blue) was derived from arsenate under modified reaction conditions. The molybdenum blue solution (20 mL) was introduced into the detection tube by suction with a syringe to form color band. As(III) was measured after oxidation with sodium dichloroisocyanuric acid. The color band length in the detection tube was correlated linearly with the arsenic (As(III) + As(V)) concentration in the range of 0.01–0.1 mg As L −1, and the relative standard deviations in the concentration range were around 1%. Arsenic was successfully detected at 0.01 mg As L −1 using this detection tube.