Spectrophotometric Determination of Cobalt(II) Using the Chromogenic Reagent 4,4′-Diazobenzenediazoaminoazobenzene in a Micellar Surfactant Medium
1997; Royal Society of Chemistry; Volume: 122; Issue: 3 Linguagem: Inglês
10.1039/a606804i
ISSN1364-5528
AutoresGu Jin, Yurui Zhu, Jiang Wanquan, Boping Xie, Bin Cheng,
Tópico(s)Analytical Chemistry and Sensors
ResumoA highly sensitive spectrophotometric method for the determination of cobalt(II) using the chromogenic reagent 4,4′-diazobenzenediazoaaminoazobenzene (BBDAB) was developed. The optimum conditions for the chromogenic reaction of cobalt(II) with BBDAB were studied in the presence of Triton X-100 and sodium tetraborate. The calibration graphs were rectilinear in the range 0–7 µg per 25 cm 3 cobalt(II). The apparent molar absorptivity is 1.72 × 10 5 dm 3 mol - 1 cm - 1 with a Sandell's sensitivity of 0.00035 µg cm - 2 . The method was applied to the determination of cobalt in soil and vitamin B 12 with satisfactory results.
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