Automated Pretreatment System for the Speciation of Cr(III) and Cr(VI) Using Dual Mini-Columns Packed with Newly Synthesized Chitosan Resin and ME-03 Resin

Abstract

Chitosan resin possessing the 4-hydroxyphthalic acid moiety (CCTS-HPA resin) was synthesized. This resin could adsorb chromium(VI) at pH 3 to 5, whereas chromium(III) could not be retained in the acidic region. The CCTS-HPA resin was used for collecting chromium(VI), and ME-03 resin was used for collecting chromium(III) before their measurement by ICP-AES measurement. Both resins were packed in mini-columns and installed serially in a laboratory-assembled automated pretreatment system (Auto-Pret System). The system provides a highly sensitive and fully automated procedure for the speciation of chromium(III) and chromium(VI). The proposed system was successfully applied to speciation of chromium(III) and chromium(VI) using 5 ml of water samples. The detection limits (S/N = 3) of chromium(III) and chromium(VI) were 0.06 and 0.04 mg l -1 , respectively, along with an analysis time of 7 min 45 s for both chromium species. The lowest determinable concentrations for both chromium species were about 0.5 mg l -1 , which was enough for the speciation of chromium in water samples.

Determination of Cr(III) and Cr(VI) at Sub-ppb Levels in Water with Solid-Phase Extraction/Metal Furnace Atomic Absorption Spectrometry

“…28 A 3 mol l -1 nitric acid was used as the eluent of Cr(III). On the other hand, a variety of eluents (e.g., nitric acid, 8,13 hydrochloric acid, 9 potassium chloride solution, 10 and ammonium nitrate/ammonium hydroxide solution 6 ) have been used for the elution of Cr(VI). If potassium chloride solution or ammonium nitrate/ammonium hydroxide solution is used as the eluent for Cr(VI), the molecular absorption and light scattering (i.e., spectral interference) may give an error to the absorbance of Cr in the AAS.…”

“…Sumida et al 11,12 preconcentrated Cr(III) and Cr(VI) in tap water, river water, wastewater, and seawater with iminodiacetate chelating resin column by ICP-AES. Furusho et al 13 developed an automated pretreatment system for the determination of Cr(III) and Cr(VI) in tap water, river water, and mineral drinking water with iminodiacetate chelating resin and synthesized chitosan resin columns by ICP-AES. In this way, the iminodiacetate chelating resin was often used for the speciation of Cr in water; however, the chelate-forming reaction 2010 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed.…”

Microfluidic Paper-based Analytical Device for the Determination of Hexavalent Chromium by Photolithographic Fabrication Using a Photomask Printed with 3D Printer

“…Various analytical techniques have been reported to determine Cr VI , spectrophotometry, 3 titration, 4 flow injection analysis, 5,6 atomic absorption spectrometry, 7,8 inductively coupled plasma optical emission spectroscopy, 9 inductively coupled plasma mass spectrometry, 10 and synchrotron-radiation X-ray fluorescence analysis. 11 These analytical techniques have high sensitivity and precision, but, require a long time for analysis, expensive instruments, and trained operators.…”

Portable Solid Phase Extraction of Copper, Cadmium and Lead Using Analig ME-02 Chelating Resin and Their Determination by Atomic Absorption Spectrometry

“…To the best of our knowledge, it is very rarely reports on the use of the methacrylate-based polymeric supports for chelating resins [17]. Reported the adsorption and preconcentration of transition and rare earth elements using monolith prepared by poly-(glycidyl methacrylate/GMA-co-ethylene dimethacrylate/EDMA) functionalized with iminodiacetic acid (IDA) [18], whereas applied Analig ME-03 chelating resin for speciation of the chromium species. The latter resin is made from functionalization of IDA to the GMA-based polymeric support.…”