SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II) USING THE CHROMOGENIC REAGENT 4,4'-DIAZOBENZENEDIAZOAMINOAZOBENZENE IN A MICELLAR SURFACTANTMEDIUM

Authors
JIN G ZHU YR JIANG WQ XIE BP CHENG B
Citation
G. Jin et al., SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II) USING THE CHROMOGENIC REAGENT 4,4'-DIAZOBENZENEDIAZOAMINOAZOBENZENE IN A MICELLAR SURFACTANTMEDIUM, Analyst, 122(3), 1997, pp. 263-265
Citations number
12
Categorie Soggetti
Chemistry Analytical
Journal title
Analyst → ACNP
ISSN journal
00032654
Volume
122
Issue
3
Year of publication
1997
Pages
263 - 265
Database
ISI
SICI code
0003-2654(1997)122:3<263:SDOCUT>2.0.ZU;2-Z
Abstract
A highly sensitive spectrophotometric method for the determination of cobalt(II) using the chromogenic reagent 4,4'-diazobenzenediazoaaminoa zobenzene (BBDAB) was developed, The optimum conditions for the chromo genic reaction of cobalt(II) with BBDAB were studied in the presence o f Triton X-100 and sodium tetraborate. The calibration graphs were rec tilinear in the range 0-7 mu g per 25 cm(3) cobalt(II). The apparent m olar absorptivity is 1.72 x 10(5) dm(3) mol(-1) cm(-1) with a Sandell' s sensitivity of 0.00035 mu g cm(-2). The method was applied to the de termination of cobalt in soil and vitamin Bit with satisfactory result s.