✦ LIBER ✦

XAFS studies of some precipitation and coloration reaction used in analytical chemistry

✍ Scribed by Chiya Numako; Izumi Nakai

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 139 KB
Volume: 208-209
Category: Article
ISSN: 0921-4526
DOI: 10.1016/0921-4526(94)00706-2

No coin nor oath required. For personal study only.

✦ Synopsis

XAFS analysis was used to reveal local atomic environment of manganese hydroxide precipitates, the reaction products of the Winkler method which is used in the determination of dissolved oxygen in analytical chemistry. From the comparison with the XANES spectra of standard materials, it is suggested that the brown manganese hydroxide precipitates oxidized from dissolved oxygen or H202 contain both divalent and trivalent ions, and are not MnO(OH)2 nor MnO2, which have been often referred as the Winkler product in general text books of analytical chemistry.

📜 SIMILAR VOLUMES

Azo-Coupling Reactions Used in Analytica

Azo-Coupling Reactions Used in Analytical Chemistry: The Role of Reactants, Intermediates, and Aqueous Medium

✍ Alexei N. Pankratov 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 German ⚖ 140 KB

## Abstract A quantum‐chemical study of the analytically important azo‐coupling reactions of naphthalen‐1‐amine (**1**) with naphthalene‐1‐diazonium (**2**) and 4‐sulphobenzenediazonium (**8**) cations has been carried out. The reactions have been found to be frontier‐controlled, and their regiosel