SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF COPPER(II) AND COBALT(II) USING PARTIAL LEAST-SQUARES REGRESSION

Tóm tắt

The simultaneous spectrophotometric determination of copper(II) and cobalt(II) is based on the formation of their complexes with diethyldithiocarbamate (DDTC) in the presence of polysorbate 20 (Tween 20) as a micellar media using partial least squares modeling. The absorption spectra were recorded from 290 to 500 nm. The calibration graph was linear in the range of 0.5-4.0 µg.mL-1 for Cu(II) (R2 = 0.9979) and 0.5-3.0 µg.mL-1 for Co(II) (R2 = 0.9976); The root mean squared error of prediction (RMSEP) was 0.160 and correlation coefficient (R 2 ) for copper and cobalt by PLS method were 0.988; 0.954 respectively. The results indicate the probability of the method in the simultaneous determination of copper(II) and cobalt(II).