Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid

Ivan P. Pozdnyakov, Tamara E. Romanova, Xiaojiao Cai, Victoria A. Salomatova, Victor F. Plyusnin, Ping Na, Olga V. Shuvaeva

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

3 Цитирования (Scopus)

Аннотация

Photooxidation of As(III) in ternary As(III) – Fe(III) – Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is [rad]OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH2+ complex and for [rad]OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.

Язык оригиналаанглийский
Страницы (с-по)337-342
Число страниц6
ЖурналChemosphere
Том181
DOI
СостояниеОпубликовано - авг 2017

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