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.
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 microg 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 microg l(-1), which was enough for the speciation of chromium in water samples.
Furusho
Yoshiaki
Y
GL Sciences Inc., Shinjuku, Tokyo 163-1130, Japan.
Sabarudin
Akhmad
A
Hakim
Lukman
L
Oshita
Koji
K
Oshima
Mitsuko
M
Motomizu
Shoji
S
D000327:Adsorption; D048271:Chitosan / Q000031:analogs & derivatives / Q000138:chemical synthesis*; D002852:Chromatography, Ion Exchange; D002857:Chromium / Q000302:isolation & purification*; D007475:Ion Exchange Resins / Q000138:chemical synthesis* / Q000737:chemistry; D012996:Solutions; D014867:Water
D007475:Ion Exchange Resins; D012996:Solutions; D014867:Water; D002857:Chromium; D048271:Chitosan