On-line preconcentration system using mini-column packed with a chelating resin for the characterization of seasonal variations of trace elements in seawater by ICP-MS and ICP-AES.
An on-line column preconcentration technique coupled with inductively coupled plasma-mass spectrometry (ICP-MS) and -atomic emission spectrometry (ICP-AES) was developed using a mini-column (ca. 3 mm i.d., 40 mm length), that was packed with chelating resin (0.2 g) of iminodiacetic acid groups, Muromac A-1. After the preconcentration step, the column was washed with ammonium acetate buffer (pH 5.5) and water to remove major elements, such as Ca and Mg, and then eluted with 4 ml of 2 mol l(-1) nitric acid. Eleven trace elements (Al, V, Fe, Co, Ni, Cu, Zn, Cd, Pb, Th and U) in seawater were determined by ICP-MS/AES. Recoveries for most of the elements tested were over 90%, although those for Al, V and Th were around 70%. The accuracy of the proposed method was evaluated by analyzing a standard reference material of seawater (NASS-4, NRC Canada). The values of Fe, Co, Ni, Cu, Zn, Cd and Pb obtained with the present method showed good agreement with the certified values as judged from the standard deviation. The method was successfully applied to characterize seasonal variations of trace elements in deep seawater (DSW) and surface seawater (SSW). In addition, no serious decrease in analytical performance of the present column system was observed during the experimental period of about 1 year.
Sumida
Takashi
T
Kochi Prefectual Industrial Technology Center, Kochi, Japan. takashi_sumida@ken3.pref.kochi.jp
Nakazato
Tetsuya
T
Tao
Hiroaki
H
Oshima
Mitsuko
M
Motomizu
Shoji
S
D000327:Adsorption; D002614:Chelating Agents / Q000494:pharmacology*; D003201:Computers; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins; D013058:Mass Spectrometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012621:Seasons; D012623:Seawater; D013054:Spectrophotometry, Atomic / Q000295:instrumentation* / Q000379:methods; D013997:Time Factors; D014131:Trace Elements / Q000032:analysis*
D002614:Chelating Agents; D007475:Ion Exchange Resins; D014131:Trace Elements