publication . Article . 1994

Determination of traces of calcium and magnesium in rare earth oxides by flow-injection analysis

Thuy, D.T.; Decnop-Weever, D.; Kok, W.Th.; Luan, P.; Nghi, T.V.;
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  • Published: 01 Jan 1994 Journal: Analytica Chimica Acta, volume 295, pages 151-157 (issn: 0003-2670, Copyright policy)
  • Publisher: Elsevier BV
  • Country: Netherlands
Abstract
Flow-injection analysis has been applied for the determination of traces of calcium and magnesium in rare earth oxide samples. The method is based on the fluorescence of the calcein complexes of calcium and magnesium in a solution with high pH. The analyte ions are separated from the rare earth ion matrix on an in-line ion-exchange column. Matrix concentrations up to 500 mg l−1 of rare earth ions can be used. To discriminate between calcium and magnesium, 8-hydroxyquinoline is used as masking agent for magnesium and EGTA for calcium. Without masking agent the sum of calcium and magnesium is obtained. The relative standard deviation of the peak height for 25 μ mo...
Subjects
free text keywords: Analytical Chemistry, Spectroscopy, Biochemistry, Environmental Chemistry, Chemistry, Inductively coupled plasma, Magnesium, chemistry.chemical_element, Calcium, Oxide, chemistry.chemical_compound, Fluorescence spectrometry, Masking agent, EGTA, Matrix (chemical analysis), international
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publication . Article . 1994

Determination of traces of calcium and magnesium in rare earth oxides by flow-injection analysis

Thuy, D.T.; Decnop-Weever, D.; Kok, W.Th.; Luan, P.; Nghi, T.V.;