NEW SIMPLE METHOD FOR THE DETERMINATION OF TRACE LEVEL COPPER (II) USING 1- [2- (ALLYLAMINO) -1-METHYLETHYL] THIOUREA IN PRESENCE OF HYDROFOB AMINES BY MOLECULAR ABSORPTION SPECTRAL METHOD IN THE UV AND VISIBLE REGION
Cu(II) with 1- [2- (allylamino) -1-methylethyl] thiourea the rapid reacts to form orange complex and also it to form to form brownish complexes in presence of the phenanthroline (Phen) and α,α′ - dipyridine ( α,α′ -dip ). The absorption spectra of the Cu(II) - AMTIC system is a curve with the maximum absorbance at 415 nm and molar absorption coefficient of 1.95.104 l mol−1 cm−1. The absorption spectra of the Cu(II)- AMTIC- Phen and Cu(II) -AMTIC - α,α′-dip systems is a curve with the maximum absorbances at 437 nm and 443 nm and molar absorption coefficients of 2.94.104 l mol−1 cm−1 and 2.81.104 l mol−1 cm−1, respectively. The absorbance was linear for 0.25–2.07 mkg ml−1 of Cu(II) in the Cu(II)- AMTIC system and 0.12 –2.56 mkg ml−1 and 0.18–2.45 mkg ml−1 of Cu(II) in the Cu(II)-AMTIC- Phen and Cu(II)-AMTIC- α,α′-dipsystems, respectively. The proposed methods was successfully used in the determination of Cu(II) in several synthetic mixtures. The relative standard deviation (n = 5) was 0%–2.0%, for Cu(II), indicating that this methods are highly precise and reproducible. The results obtained agree well with synthetic mixture samples analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES). Keywords: copper, 1- [2- (allylamino) -1-methylethyl] thiocarbamide, phenanthroline (Phen ) and α,α′ - dipyridine.
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