Sediment trap fluxes and benthic recycling of organic carbon, polycyclic aromatic hydrocarbons, and polychlorobiphenyl congeners in Lake Superior

Monitoring of selected estrogenic compounds and estrogenic activity in surface water and sediment of the Yellow River in China using combined chemical and biological tools

“…Distribution of contaminants in the sediments of a river is also related to sediment properties such as organic carbon, and particle size distribution (Baker et al, 1991;Lai et al, 2000). Weak correlations of the contaminant concentrations and TOC were found for the four compounds 4-NP, 4-t-OP, BPA and TCS, but no correlations were found between the contaminant concentrations and clay content ( Fig.…”

The effect of protozoan grazers on the cycling of polychlorinated biphenyls (PCBs) in marine systems

“…Recent field studies (Lake Superior - Baker et al, 1991;Mediterranean SeaLipiatou et al, 1993;Esthwaite Water -Sanders et al, 1996) highlight the need for the integration of both the biological (Skoglund et al, 1996) and physico-chemical (Wu and Gschwend, 1986) models of CB speciation. The equilibrium partitioning models predict that PCBs will absorb into abiotic particles during settling.…”

Enhancement Adsorption of Heavy Metal from Recovered Base Oil using Zeolite and kaolinite by Phase Transfer Catalyst and anionic surfactants-Part 2

“…They can cause problems for humans and animals. There are several physico-chemical methods, such as coagulation-flocculation and chemical precipitation (8,9). Consequently, research efforts have been directed towards adsorption using clay s and zeolite as an alternative technique for the removal of heavy metals.…”

“…Kinetic studies of adsorption can carried out using the finite bath technique, where a large volume of the adsorbate is admixed with required weight of adsorbent. The performance of zeolite in the removal of heavy metals has been discussed in research literature and conclusions in relation to their treatment performance (9). Metallic compounds should be removed from used lubrication oil to obtain base oil suitable for the formulation of new lubricants.…”