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.

Hydrothermal carbonate chimneys from a continental rift (Afar Rift): Mineralogy, geochemistry, and mode of formation

“…Data were collected in low resolution mode for sensitivity and corrected for oxide and hydroxide interferences by analyzing solutions of ultra-pure H 2 O, Ba+Ce, Pr+Nd and Sm+Gd+Tb (Barrat et al, 1996;Bayon et al, 2009a). Concentrations were calculated using the Tm-addition method Freslon et al, 2011). …”

A Robust Procedure for High‐Precision Determination of Rare Earth Element Concentrations in Seawater

“…, Freslon et al . ). The desolvating sample introduction system significantly mitigates the problem of oxide formation, and provides an alternative approach.…”

“…, Freslon et al . ), chelating and ion‐exchange resins (De Baar et al . , Willie and Sturgeon , Zhu et al .…”

“…, Freslon et al . ), permits REE yield to be assessed. Alternatively, isotope dilution provides an assessment of concentration independent of yield, making it the most robust approach (Greaves et al .…”

Study on Multi-walled Carbon Nanotubes On-line Separation/ Preconcentration of Chromium(III) and Chromium Speciation

“…Therefore, it is essential to conduct sample enrichment and separation before testing. For this purpose, various separation and preconcentration methods, such as solid-phase extraction, [4][5][6] coprecipitation, 7 liquid-liquid extraction 8 and cloud-point exchange, 9 have been developed. Among these methods, the mini-column preconcentration technology is most widely employed because a variety of adsorption materials are used for adsorbing Cr(III) and/or Cr(VI) selectively.…”