6533b838fe1ef96bd12a3a8e

RESEARCH PRODUCT

A chemometric study of the simultaneous determination of calcium and magnesium in natural waters

F. Bosch ReigF Blasco GómezP. Campíns Falcó

subject

AnalyteChromatographymedicine.diagnostic_testChemistryMagnesiumAnalytical chemistrychemistry.chemical_elementArsenazo IIICalciumAnalytical ChemistrySpectrophotometryStandard additionPartial least squares regressionmedicineTernary operation

description

A method for the simultaneous spectrophotometric determination of calcium and magnesium in mineral waters with an FIA system is tested. The method is based on the reaction between the analytes and arsenazo(III) at pH 8.5. The calculations of the amounts of both analytes in the samples are carried out with the H-point standard addition method (HPSAM) for ternary mixtures, and with a partial least squares (PLS) model after a proper variable selection. The results obtained for the determination of calcium were comparable using both methods. The employment of the HPSAM brings to our attention the influence of the calcium concentration in the sample to the development of the reaction between magnesium and arsenazo(III). HPSAM also permits to estimate the concentration of magnesium in the samples.

yearjournalcountryeditionlanguage
1999-06-01Talanta
https://doi.org/10.1016/s0039-9140(98)00352-x