Naslov
Influence of suspended clay minerals and humic matter on the solid phase extraction efficiency of selected pesticides from water

Autori
Mutavdžić, Dragana ; Brnardić, Ivan ; Kaštelan-Macan, Marija

Izvornik
Journal of environmental science and health. Part B (0360-1234) 41 (2006), 7; 1085-1101

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
pesticides ; suspended clay minerals ; humic matter ; SPE efficiency ; thin-layer chromatography

Sažetak
The purpose of this investigation was to determine the influence of humic acids (HA) and Ca- montmorillonite (CaM) on the solid-phase extraction (SPE) efficiency of atrazine, alachlor and α -cypermethrin from water samples at various pH-values. The nature and intensity of binding of the studied pesticides to CaM were determined by X-ray diffraction analysis and termogravimetric analysis (TGA) test. The studied pesticides eluted from discs were analysed by thin-layer chromatography (TLC). The effects of CaM and humic acid were generally pH-dependent and acted independently in extraction efficiency influence. Lower recovery of pesticides was observed at higher pH values when CaM was ≥ 0.1 g and was attributed to greater dispersion of clay, increased surface area and subsequent adsorption. Concentrations of dissolved organic carbon (DOC) in humic acid had less effect on the extraction efficiency when water was at pH 8 compared to water at pH 2, which was probably due to greater nonpolar interactions of the pesticides to the charge-neutralized humic acid molecule.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

Napomena
Glavni autor: Dragana Mutavdžić

POVEZANOST RADA