Sorption coefficients of polycyclic aromatic hydrocarbons for two lake sediments: Influence of the bactericide sodium azide

Autor:	Dick T.H.M. Sum, Theo L. Sinnige, S. Marca Schrap, Antoon Opperhuizen, P. Gert-Jan de Maagd
Rok vydání:	1998
Předmět:	Total organic carbon chemistry.chemical_classification Volatilisation Health Toxicology and Mutagenesis Sorption Biodegradation Partition coefficient chemistry.chemical_compound Hydrocarbon chemistry Environmental chemistry Environmental Chemistry Sodium azide Water pollution
Zdroj:	Environmental Toxicology and Chemistry. 17:1899-1907
ISSN:	1552-8618 0730-7268
Popis:	Sorption coefficients (Kps) of a series of polycyclic aromatic hydrocarbons (PAHs) were determined in two Dutch freshwater lake sediments to improve the insight into sorption in the aquatic environment. The influence of experimental factors, such as compound concentration, equilibration time, and influence of a bactericide on Kp, was studied. No significant influence of compound concentration on Kp was found. A contact time of 48 h was sufficient to reach equilibrium between PAHs in the sediment and water phase. In the absence of the bactericide, sodium azide, incomplete mass balances, and high Kp of low molecular weight PAHs were found that were not caused by volatilization from, photodegradation in, or sorption by the test system. In the presence of sodium azide, however, high mass balances and lower Kp were found for these compounds. This suggested that significant biodegradation of these compounds occurred in the water phase in the absence of sodium azide. The organic carbon-normalized sorption coefficients (Koc) of the PAHs in Lake Oostvaardersplassen were two to three times higher than those in Lake Ketelmeer sediment. Although Koc of the PAHs differed for the two sediments, a clear relationship was found between Koc and the octanol/water partition coefficient for both sediments and between the Koc of both sediments. In conclusion, the methodology to determine Kp of biodegradable compounds should include the prevention of bacterial activity, e.g., by addition of sodium azide. Sorption of PAHs in the Dutch lake sediments is determined by the hydrophobicity of the PAH, the organic carbon content of the sediment, and one or more unspecified sediment-specific characteristics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4398d79ff3c06996ea10ebf3d567718f https://doi.org/10.1002/etc.5620171002 Zobrazit plný text záznamu Plný text