Speciation of chromium in seawater by ICP-AES with dual mini-columns containing chelating resin.
A method for the preconcentration and speciation of chromium in seawater was developed. On-line preconcentration and determination were carried out by using inductively coupled plasma atomic emission spectrometry (ICP-AES) with dual mini-columns containing a chelating resin. In this system, Cr(III) was collected on the first column. The effluent containing residual chromium from the first column was collected on the second column after passing through a reduction-switching unit, in which the reducing agent was introduced, or not, for the reduction of Cr(VI) to Cr(lII). Cr(VI) was determined as the difference between the concentration of pre-reduced Cr(VI) and Cr(III) in the effluent from the first column. The detection limits for Cr(III) and Cr(VI) were 0.04 and 0.09 microg l(-1), respectively.
Sumida
Takashi
T
Kochi Prefectual Industrial Technology Center, Nunoshida 3992-3, Kochi 781-5101, Japan. takashi_sumida@ken3.pref.kochi.jp
Sabarudin
Akhmad
A
Oshima
Mitsuko
M
Motomizu
Shoji
S
D002614:Chelating Agents / Q000737:chemistry*; D002857:Chromium / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D012117:Resins, Synthetic / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000295:instrumentation* / Q000379:methods*; D013499:Surface Properties; D013997:Time Factors
D002614:Chelating Agents; D012117:Resins, Synthetic; D002857:Chromium