Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:3.4.23.17 (
PCE
)
1,301
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Sorption and desorption play an important role in the transport and the fate of tetrachloroethylene (
PCE
) in soil. In order to examine influences of different soil compositions on
PCE
sorption-desorption, equilibrium batch experiments were carried out using four sorbents (natural soil with 2.23% total organic carbon (TOC), H2O2-treated soil, 375 degrees C-treated soil and 600 degrees C-treated soil) with different initial
PCE
liquid concentrations (c0). The effects of main parameters (TOC, soft carbon, hard carbon, minerals, c0) on
PCE
sorption-desorption were investigated. At 16 degrees C, when c0 was increased from 5 to 80 mg x L(-1), the results showed that sorption and desorption isotherms of
PCE
on four sorbents can be best described by the Freundlich model (r2 > 0.96). The sorption contribution rate of
SOM
was higher than 60% in natural soil, and hard carbon was the main influencing factor,while the desorption contribution rate of
SOM
was close to that of minerals in natural soil, and soft carbon accounted for more than 80% in the total desorption contribution rate of
SOM
. In addition, the higher the c0, the higher the sorption contribution rate of
PCE
in hard carbon and desorption contribution rate of
PCE
in soft carbon and minerals were. Moreover, desorption of
PCE
from four sorbents exhibited hysteresis, and hard carbon played a remarkable role in the hysteresis of natural soil.
...
PMID:[Effects of soil compositions on sorption and desorption behavior of tetrachloroethylene in soil]. 2464 Sep 1
