Response to comment on 'Accumulation of Organochlorine Pesticides and PCBs by Semipermeable Membrane Devices and Mytilus edulis in New Bedford Harbor'

Article Abstract:

The modifications effected by researchers Hofelt and Shea on the standard semi-permeable membrane design (SPMD) was meant to measure the diffusion of organochlorine pesticides and PCBs through a membrane using an equilibrium model, not as a linear model. The modifications were effected to better mimic the accumulation mechanism in mussels than those offered by the SPMD design. This does not require the calculation of sorption kinetics, especially those corrected for membrane thickness and media kinetics.

Polychlorinated biphenyls, Bioaccumulation

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Determination of waterborne bioavailable organochlorine pesticide residues in the lower Missouri River

Article Abstract:

A study has been conducted to determine the presence of organochlorine (OC) pesticides in the main stem of the Missouri River using a semipermeable membrane device. OCs were detected in all five main stem sites, with chlordane components, heptachlor epoxide, taxaphene and dieldrin at high concentrations. There was a high accumulation of dieldrin in Glasgow, MO, at 800 ng/sample and of heptachlor epoxide in Hermann, MO, at 180 ng/sample. Replicate SPMD also showed similar quantities of the OCs.

Environmental aspects, Pollution, Missouri River

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Comment on 'Accumulation of Organochlorine Pesticides and PCB by Semipermeable Membrane Devices and Mytilus edulis in New Bedford Harbor'

Article Abstract:

The changes effected by researchers Hofelt and Shea on the standard semi-permeable devices (SPMD) design to achieve a 100L/d sampling rate errs on two counts. The changes in the standard SPMD design increased the SPMD area by twice its original area and membrane thickness by three times its original thickness. The changes also failed to account for the effects of the switching of rate control due to membrane-thickness parameter.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Membranous Separation Media, Usage, Lipid membranes, Membrane filters

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