Simultaneous determination of orthophosphate and arsenate based on multi-way spectroscopic-kinetic data evaluation

摘要: Abstract Comparison has been made of various multivariate calibration models for the simultaneous determination phosphate and arsenate. Both ions react with molybdate ascorbic acid forming a blue complex. Differences appear two both respect to spectral kinetic behaviour. Multiway partial least squares (PLS) based on combined effect differences are superior PLS either difference alone. The concentration working range was 0–88 μmol l −1 0–27 μmol l root mean square error prediction values were typically 6 (P) 2 (As) μmol l when utilising 31 spectra each solution applied. 410–820 nm, one absorbance value measured every second nm (205 data points), scan/min performed. Phosphate catalyses reaction between arsenate added reagents due formation or more mixed complexes.