ISSN:
1436-5073
Keywords:
4-(2-benzothiazolylazo)pyrocatechol
;
iron determination
;
spectrophotometry
;
acetone-aqueous solution
;
water
;
iron(II) complex
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 4-(2-Benzothiazolylazo)pyrocatechol (BTAPC), a new organic reagent, reacts with Fe(II) to form a stable, water-soluble, violet, positively charged, binary complex over a pH range of 6.3 to 6.8. Some water-miscible organic solvents and surfactants have solubilization and sensibilization effects. In 40% acetone-water medium at 25 °C, a μ (ionic strength) value of 0.1 and a pH value of 6.5, the ratio of Fe(II) to BTAPC in the complex is 1∶ 2 with an apparent stability constant of 1.97 × 109 and two absorption peaks at 535 and 615 nm. If the absorbance is measured at 615 nm, not only the sensitivity is high (ɛ615 = 1.10 × 105 1 · mol−1 · cm−1) and the contrast (Δλ) is large (90 nm), but also the selectivity is fairly good. Beer's law is obeyed for iron along the range of 0 to 16 μg per 25 ml. The satisfactory results have been achieved after applying the method to the determination of traces of iron in water.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01244772
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