title: Determination of rare earth elements and other trace elements (Y, Mn, Co, Cr) in seawater using Tm addition and Mg(OH)₂ co-precipitation.
abstract: This paper reports on a novel procedure for determining trace element abundances (REE and Y, Cr, Mn, Co) in seawater by inductively coupled plasma sector field mass spectrometry (ICP-SFMS). The procedure uses a combination of pre-concentration using co-precipitation onto magnesium hydroxides and addition of thulium spike. The validity of the method was assessed onto 25 ml volumes of certified reference materials (NASS- and CASS-4) and in house seawater standard. Procedural blanks were determined by applying the same procedure to aliquots of seawater previously depleted in trace elements by successive Mg(OH)(2) co-precipitations, yielding estimated contributions to the studied samples better than 1.1% for all elements, with the exception of Cr (<3.3%) and Co (up to 8%). The reproducibility of the method over the six month duration of the study was smaller than 11% RSD for all the studied elements. Results obtained for NASS-5 and CASS-4 agree well with published working values for trace elements.
authors.affiliation: Département Géosciences Marines, IFREMER, 29280 Plouzané, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Freslon
authors.forename: Germain
authors.initials: G
authors.lastname: Bayon
authors.forename: Dominique
authors.initials: D
authors.lastname: Birot
authors.forename: Claire
authors.initials: C
authors.lastname: Bollinger
authors.forename: Jean Alix
authors.initials: JA
authors.lastname: Barrat
mesh_terms: D011232:Chemical Precipitation; D008276:Magnesium Hydroxide; D013058:Mass Spectrometry; D019216:Metals, Heavy / Q000032:analysis*; D008674:Metals, Rare Earth / Q000032:analysis*; D008722:Methods; D015203:Reproducibility of Results; D012623:Seawater / Q000032:analysis*; D013932:Thulium
chemical_list: D019216:Metals, Heavy; D008674:Metals, Rare Earth; D013932:Thulium; D008276:Magnesium Hydroxide