A Simple in situ Visual and Tristimulus Colorimetric Method for the Determination of Trace Arsenic in Environmental Water after Its Collection on a Mercury(II)-Impregnated Paper

Abstract

A simple in situ visual and tristimulus colorimetric method for the determination of trace arsenic in environmental water after collecting arsenic on a test paper impregnated with mercury(II) bromide and rosaniline chloride by its reduction aeration has been developed. The color development on the test paper is based on the formations of AsH(HgBr)2 (yellow) and/or As(HgBr)3 (brownish yellow) by a reaction between mercury(II) bromide and arsine (AsH3), which is produced through the reduction of As(III) (arsenite ion) and/or As(V) (arsenate ion) in a sample solution. To a sample solution, potassium iodide, tin(II) chloride, zinc sand and 4 ml of 6 M hydrochloric acid solution were added successively. The liberated arsine was collected on the test paper. The yellow or brownish-yellow color intensity on the test paper was measured by a tristimulus colorimeter and also by a visual method. The established method is applicable to the determination of arsenic in environmental water sample such as river, brackish, and seawater types.

On-site quantitation of arsenic in drinking water by disk solid-phase extraction/mobile X-ray fluorescence spectrometry

“…Stripping voltammetry (SV) [5,6] and colorimetry [7][8][9][10][11][12][13] have been developed for the on-site determination of inorganic As in water. These are inexpensive and rapid, and are able to detect As on a μg L À 1 scale.…”

“…However, SV requires a power supply, an As standard solution for calibration, and a reduction with heating in the field. The Gutzeit method is a popular colorimetric method for As detection [7,8], and field test kits using this method are available [9]. However, field workers must be careful because the Gutzeit method generates poisonous arsine gas [10].…”

Visual Detection of Arsenic Using Hydride Generation Followed by Reaction with Silver Bis(2-ethylhexyl)dithiocarbamate Retained in a Support Filter

“…The color of filters was measured by reflection spectrophotometer (Konica Minolta CM-2600D), and was digitized in CIE L*a*b* color scale. 26,27 The color difference (ΔE*(ab)) before and after the reaction was derived as follows:…”

Design and development of an automated flow injection instrument for the determination of arsenic species in natural waters

“…11,17,18 In order to maintain the integrity of the sample and to help prevent possible contamination, sensitive and selective field-based techniques are needed. Various electrochemical, [19][20][21][22] biosensor-based, 23 and colorimetric methods [24][25][26][27][28][29][30][31] have shown promise for fieldbased detection of arsenic species.…”