Spectrophotometric determination of vanadium as vanadium(IV) pyridine thiocyanate

Autor:	Gilbert H. Ayres, Lucy E. Scroggie
Rok vydání:	1962
Předmět:	Electrolysis Aqueous solution Thiocyanate Inorganic chemistry Vanadium chemistry.chemical_element Biochemistry Analytical Chemistry law.invention Mercury (element) Absorbance chemistry.chemical_compound chemistry Thiocyanate ion law Pyridine Environmental Chemistry Spectroscopy
Zdroj:	Analytica Chimica Acta. 26:470-477
ISSN:	0003-2670
DOI:	10.1016/s0003-2670(00)88415-9
Popis:	A spectrophotometric determination of vanadium as vanadium(IV) pyridine thiocyanate is described. The blue complex is formed in acidic aqueous solution and extracted into pyridine-chloroform. Absorbance is measured at 7.40 mμ. The range of best accuracy for 1-cm cells is from about 80 to 240 μg of vanadium per ml, and sensitivity is 0.4 μg of vanadium per cm2 at 7.40 mμ. The vanadium may be present initially as vanadium(IV) or vanadium(V), which is reduced to vanadium(IV) by the large excess of thiocyanate ion added. Several elements interfere in the determination ; a separation procedure involving mercury cathode electrolysis is suggested.
Databáze:	OpenAIRE
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