2-COMPARTMENT THERMODYNAMIC MODEL FOR BIOCONCENTRATION OF HYDROPHOBICORGANIC-CHEMICALS BY ALGA - QUANTITATIVE RELATIONSHIP BETWEEN BIOCONCENTRATION FACTOR AND SURFACE-AREA OF MARINE-ALGAE OR OCTANOL WATER PARTITION-COEFFICIENT/
Xl. Wang et al., 2-COMPARTMENT THERMODYNAMIC MODEL FOR BIOCONCENTRATION OF HYDROPHOBICORGANIC-CHEMICALS BY ALGA - QUANTITATIVE RELATIONSHIP BETWEEN BIOCONCENTRATION FACTOR AND SURFACE-AREA OF MARINE-ALGAE OR OCTANOL WATER PARTITION-COEFFICIENT/, Chemosphere, 35(8), 1997, pp. 1781-1797
A two-compartment thermodynamic model for bioconcentration of hydropho
bic organic chemicals (HOCs) by algae was proposed. In the model, it w
as assumed that 1) the bioconcentration is comparable to physicochemic
al liquid-liquid partitioning, and is predominantly the result of inte
rfacial processes of alga cells as well as HOC; 2) the surface excess
quantity of HOC with respect to water phase can be expressed by Gibbs
equation, and increases with increasing HOC concentration in alga cell
s; 3) the hydrophobic nature of alga cells, wherein only dispersion in
teraction contributes to their surface tension, remain almost unchange
d after adsorption of HOC. From the model it was concluded that biocon
centration factor (log BCF) has linear relation with specific surface
area (log S) of alga cells, n-octanol/water partition coefficient (log
K-OW) of HOC, and HOC concentration in the water (log C-W) respective
ly. The model was tested by the bioconcentration of monochlorobenzene,
1,2-dichlorobenzene, 1,2,3,4-tetrachlorobenzene, and pentachlorobenze
ne by marine algae including Chlorella marine, Nannochloropsis oculata
, Pyramidomonas sp., Platymonas subcordiformis, and Phaeodactylum tric
ornutum. BCF values were obtained not only with the bioconcentration m
odel, but also with the combined bioconcentration and probability mode
l. It was found that the bioconcentration factors of a chemical was in
creaseing with the specific surface area (S) of different marine algae
. (C) 1997 Elsevier Science Ltd.