ISSN:
1436-5073
Keywords:
copper determination
;
spectrophotometry
;
1-phenyl-4,4,6-trimethyl(1H, 4H)-pyrimidine-2-thiol
;
microcrystalline naphthalene
;
separation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A selective Spectrophotometric method has been developed for the trace determination of copper after adsorption of its 1-phenyl-4,4,6-trimethyl(1H, 4H)-pyrimidine-2-thiol (PTPT) complex onto microcrystalline naphthalene. The complex is quantitatively adsorbed on naphthalene in the pH range 7.5–11.5, separated by filtration, dissolved in dimethylformamide (DMF) and determined spectrophotometrically at 400 nm. Beer's law is obeyed in the concentration range 2.5–37.5 μg of copper in 10 ml of DMF. The molar absorptivity and Sandell's sensitivity are 1.30 × 1041 · mol−1 · cm−1 and 0.0048βg cm−2, respectively. Ten replicate analyses of a solution containing 20.0 μg of copper gave a mean absorbance of 0.410 with a relative standard deviation of 0.91 %. The interferences of various ions have been studied and the method has been validated by the determination of copper in various standard reference materials, beers, wines, human hair, goat liver and environmental samples.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01242467
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