ISSN:
1436-5073
Schlagwort(e):
carminic acid
;
molybdenum
;
vanadium
;
tensoactives
;
CTAB spectrophotometry
;
FIA
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The color-forming reactions of molybdenum(VI) and vanadium(IV) with carminic acid (CA) in the presence of cetyltrimethylammonium bromide (CTAB) were used in the flow-injection determination of these metals. The micellar medium enhances the spectrophotometric features of the Mo(VI)-CA and V(IV)-CA binary complexes, and the higher solubility of these complexes when the CTAB concentration is above critical micelle concentration permits the easy application of flow-injection systems. Under the optimum conditions, linear calibration graphs were obtained from 0.76 to 28.8 μg/ml for molybdenum and from 0.30 to 9.1 μg/ml for vanadium. The detection limits were 0.33 and 0.16 μg/ml for molybdenum and vanadium, respectively. The selectivity of the method was investigated and the procedure was successfully applied to the determination of molybdenum in steels and pharmaceuticals and of vanadium in petroleum products.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01244360
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