caa a22 4500 467995400 CHVBK 20180323112555.0 cr unu---uuuuu 170328e19900701xx s 000 0 eng 10.1007/BF01244772 doi (NATIONALLICENCE)springer-10.1007/BF01244772 Spectrophotometric determination of iron (II) using a highly sensitive chromogenic reaction of 4-(2-benzothiazolylazo)pyrocatechol [Elektronische Daten] [Zhen Wang, Cheng Yao, Kuang Cheng] 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. Springer-Verlag, 1990 4-(2-benzothiazolylazo)pyrocatechol nationallicence iron determination nationallicence spectrophotometry nationallicence acetone-aqueous solution nationallicence water nationallicence iron(II) complex nationallicence Wang Zhen Department of Applied Chemistry, Nanjing Institute of Chemical Technology, 210009, Nanjing, People's Republic of China aut Yao Cheng Department of Applied Chemistry, Nanjing Institute of Chemical Technology, 210009, Nanjing, People's Republic of China aut Cheng Kuang Department of Chemistry, University of Missouri, 64110, Kansas City, MO, USA aut Microchimica Acta Springer-Verlag 102/4-6(1990-07-01), 311-318 0026-3672 102:4-6<311 1990 102 604 https://doi.org/10.1007/BF01244772 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01244772 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Zhen Department of Applied Chemistry, Nanjing Institute of Chemical Technology, 210009, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Yao Cheng Department of Applied Chemistry, Nanjing Institute of Chemical Technology, 210009, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Cheng Kuang Department of Chemistry, University of Missouri, 64110, Kansas City, MO, USA aut NATIONALLICENCE 773 0- Microchimica Acta Springer-Verlag 102/4-6(1990-07-01), 311-318 0026-3672 102:4-6<311 1990 102 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer