Application of a permeant/polymer diffusional model to the desorption of polychlorinated biphenyls from Hudson River sediments

Autor:	Angelo Anthony Bracco, Mark Harkness, Robert R. Balcarcel, Kenneth M. Carroll
Rok vydání:	1994
Předmět:	Total organic carbon chemistry.chemical_classification Chemistry food and beverages Sediment Fraction (chemistry) General Chemistry Soil contamination Adsorption Environmental chemistry Desorption Environmental Chemistry Organic matter Ion-exchange resin
Zdroj:	Environmental Science & Technology. 28:253-258
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es00051a011
Popis:	The desorption of polychlorinated biphenyls (PCBs) from Hudson River sediments was examined using XAD-4 resin as a PCB adsorbent. Both a rapidly desorbing labile component and a more slowly desorbing resistant component were observed. The fraction of PCBs in the resistant component was found to be a function of PCB concentration and total organic carbon in the sediment, independent of inorganic particle size. Milling the sediment had no effect on PCB desorption, while pretreatment of the sediment using heat (with and without caustic addition) enhanced the rate ofdesorption and significantly decreased the resistant fraction. We propose that the labile and resistant fractions arise from disparate diffusional rates of PCBs from the swollen and condensed phases of the sediment organic matter
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee0906de2bad7b144c90c8894fe9db3f https://doi.org/10.1021/es00051a011 Zobrazit plný text záznamu