Determination of trace levels of iron in a seawater sample using isotope dilution/inductively coupled plasma mass spectrometry.
An analytical method for trace levels of iron in a seawater sample using isotope dilution ICP-MS was developed. Preconcentration of iron and the removal of major elements in seawater such as alkali and alkaline-earth elements can be carried out quickly using a chelating resin disk by adjusting the sample pH to 3. The collision cell option of the ICP-MS instrument method was used to improve the performance of the instrument for iron measurements since ArO and ArN interferences could be reduced using this analytical method. About 4 ml min(-1) helium, as the collision gas, were introduced into the cell. 40Ar14N and 40Ar16O which interfere with 54Fe and 56Fe in water had their amounts decreased by 5 orders of magnitude. Then, the isotope dilution method was used for iron determination below ng g(-1) level of trace iron in four environmental reference materials (river water standard sample JAC-0031 (Japan Soc. for Analytical Chemistry), estuarine standard sample SLEW-2 (NRC Canada) and seawater standard samples CASS-3 and NASS-5 (NRC Canada)) were measured. Good agreement between analytical results and certified values of reference materials was obtained, which confirmed the effectiveness of this method.
Takaku
Yuichi
Y
Institute for Environmental Sciences, Department of Radioecology, Ienomae, Obuchi, Rokkasho-mura, Kamikita-gun, Aomori, Japan.
Hayashi
Takuma
T
Ota
Ikuko
I
Hasegawa
Hidenao
H
Ueda
Shinji
S
D001128:Argon / Q000032:analysis; D002614:Chelating Agents / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006371:Helium / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007201:Indicator Dilution Techniques; D007501:Iron / Q000032:analysis* / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods*; D009584:Nitrogen / Q000032:analysis; D012623:Seawater / Q000032:analysis*; D013997:Time Factors; D014131:Trace Elements
D002614:Chelating Agents; D014131:Trace Elements; D006371:Helium; D001128:Argon; D007501:Iron; D009584:Nitrogen