Accumulation of Organochlorine Pesticides from Water Using Triolein Embedded Cellulose Acetate Membranes

Abstract

A new type of composite membrane, triolein embedded cellulose acetate membrane (TECAM), was produced by embedding triolein drops in the matrix of cellulose acetate polymers. The distribution of six organochlorine pesticides (OCPs) between water and TECAM was investigated in a static water system. Its field application was tested in Taihu Lake (China). Results from both laboratory and field experiments indicate that TECAM quickly and efficiently accumulated hydrophobic OCPs from water. Under laboratory conditions, uptake equilibrium was achieved within 24 h for all of the six OCPs. Significant correlations were obtained between log K p TECAM (TECAM-water partition coefficient) and log K ow (octanol-water partition coefficient); between log K tw (triolein-water partition coefficient, triolein in TECAM) and log K ow ; and between log K tw and log BCF (bioconcentration factor in rainbow trout calculated from literatures). Triolein in TECAM significantly increased the accumulation of strongly hydrophobic OCPs when compared to the use of cellulose acetate polymers alone. Temperature had only slight effects on the K p TECAM values of the strongly hydrophobic OCPs. The partition coefficient obtained by measuring OCP concentrations in TECAM under field conditions could be successfully applied to estimate OCPs concentrations in surface water.

Estimation of the Uptake Rate Constants for Polycyclic Aromatic Hydrocarbons Accumulated by Semipermeable Membrane Devices and Triolein-Embedded Cellulose Acetate Membranes

“…In the case of the SPMD, the approach of a curve region could be observed for naphthalene and phenanthrene at the end of exposure, but for benzo [b]fluoranthene and benzo[a]pyrene, the uptake remained in the linear uptake phase similar to that observed for TECAMs. This is not surprising because in our earlier study for target compounds with similar hydrophobicity shorter equilibrium times were also observed for TECAMs compared to SPMDs (11).…”

“…The TECAMs were prepared in a clean room to reduce vapor-phase contamination. Details of the preparation of TECAMs were reported elsewhere (11). TECAMs were constructed in the same configuration: 40-50 µm thick, 12 cm wide, and 18 cm long.…”

“…TECAMs were stable and persistent in hexane, with negligible weight loss of triolein and cellulose acetate during dialysis. Therefore, no additional cleanup of samples was required in this procedure (11).…”

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

“…Solvent and other chemicals used in the study were of GC or analytical reagent grade. Small pieces of TECAM (4 cm  6 cm) were used and the procedure for preparing was the same as described previously [22].…”

Research progress of novel adsorption processes in water purification: A review

“…Compared with normal adsorbents such as activated carbon and alumina, this DNA matrix showed a selective adsorptivity for the dioxin derivatives with planar structure such as dibenzo-p-dioxin, dibenzofuran, and biphenyl. Some researchers (Xu et al, 2005b;Ke et al, 2006) prepared a new type of composite membrane, triolein embedded-cellulose acetate membrane (TECAM), and used it in the uptake of six organochlorine pesticides. Results indicated that TECAM quickly and efficiently accumulated hydrophobic organochlorine pesticides (OCPs) from water.…”