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EC number: 208-253-0
CAS number: 518-47-8
Adsorption / desorption:
Based on the available studies for the
target substance Fluorescein sodium (Cas no.518-47-8) are summarized as
From peer reviewed journal (Bull. Environ.
Contam. Toxicol. (1998) 61:426-432) study investigated the dissipation
and fate of phloxine B and uranine in water and sediment in the spill
site. Distribution coefficients (Koc) of phloxine B and uranine were
It was observed that adsorption coefficients
of uranine were higher in soil than in sediments although the organic
carbon content of the sediment is higher than soil. Uranine was not
detected in the sediment samples after 284 days. Uranine was less
persistent compared to Phloxine B.
The adsorption coefficient (Koc) value of
Uranine in soil was found to be 88.81along with percentage organic
carbon of 3.10%.While same test condition for sediment indicate the
adsorption coefficient (Koc) value of Uranine as 69.43 along with
percentage organic carbon of 3.94%.
While the objective of the other study was
to utilize batch studies to determine the adsorptive characteristics of
fluorescein with a low organic content alluvial aquifer sand.
Inspection of the adsorption isotherm for
fluorescein indicates that it demonstrated linearity at low
concentrations with non linearity experienced at higher concentrations.
The koc value of 120 cm3/g for fluorescein was obtained in the batch
equilibrium studies. The Freundlich adsorption isotherm could not be
estimated due to the discontinuous nature of the adsorption isotherm and
background fluorescence observed at higher concentrations. (Groundwater,
Volume 29, Issue 3, May 1991, Pages 341–349)
Thus overall experimental studies indicate
that the test substance Fluorescein sodium (uranine) have tendency to
adsorbed higher in soil than in sediments.
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