Journal
ANALYTICA CHIMICA ACTA
Volume 565, Issue 2, Pages 222-233Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2006.02.028
Keywords
ICP-MS; iron; manganese; cobalt; magnesium co-precipitation; Seawater; Mg(OH)(2)
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The chemistry of magnesium precipitation preconcentration of Fe, Mn, and Co from seawater was investigated, and this analytical technique was adapted for use with the Element-2 inductively coupled plasma mass spectrometer (E2 ICP-MS). Experiments revealed that the scavenging efficiency of Mn using the precipitation protocol described here was similar to 95% and similar to that previously observed with Fe. In contrast, the scavenging efficiency of Co was three-fold lower than that of Fe and Mn, resulting in poor recovery. An increase in sample size to 13 mL led to several desired effects: (1) an increase in the Fe and Mn signals allowing a final dilution of samples to 0.5 mL and the use of an autosampler, (2) an increase in precision to similar to 1-2.5% R.S.D., and (3) an increase in signal relative to the blank. Experiments suggest metal concentration from seawater occurs during the formation of Mg(OH)(2) precipitate, whereas P was scavenged by adsorption onto the Mg(OH)(2) Particles. Example vertical profiles are shown for dissolved Fe and Mn from the Equatorial Pacific. (c) 2006 Elsevier B.V. All rights reserved.
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