Fiber Optic-linear Array Detection Spectrophotometry in Combination with Dispersive Liquid-Liquid Microextraction for Preconcentration and Determination of Copper

In this research, simple, rapid and efficient method, dispersive liquid-liquid microextraction (DLLME) combined fiber optic-linear array detection spectrophotometry (FO-LADS) was developed using a cylindrical micro-cell for preconcentration and determination of Cu(II) in samples. DLLME and FO-LADS methods have good matching conditions for being combined since FO-LADS is a suitable method for the determination of analytes in low volume of the remained phase obtained after DLLME. Molar absorptivity of complex Cu with (4-benzylpiperidineditiocarbamate potassium salt) (BPDC) was determined as 2.75 x 10(4) L mol(-1) cm(-1) at lambda(max) = 436 nm. Under the optimum conditions the calibration graph was linear in the rage of 2-70 mu g L-1 with detection limit of 0.34 mu g L-1. The proposed procedure was successfully applied to the determination of Cu(II) in real water samples and human urine sample.