Impact of river transport characteristics on contaminant sampling error and design

Article Abstract:

The effects of five inherently variable river transport characterisics on the contaminant sampling design and loading error of monitoring programs were examined. Results revealed that the extent of the impact of transport characteristics on loading sites depends on the site and contaminant involved and on a program's goals and desired accuracy levels. The success of a program therefore lies in the ability to understand a sampling station's complete transport and loading regimes, to identify clear accuracy requirements and to determine the desired end products.

Environmental aspects, Rivers, Statistical sampling, Sampling (Statistics), Marine pollution, Experimental design, Research design, Inland water transportation

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Concentrating suspended sediment samples by filtration: effect on primary grain-size distribution

Article Abstract:

Primary grain-size distribution is not severely affected when suspended sediment samples are filtered and then resuspended. Filtration is an especially useful separation method when sample concentrations are low and grain-size distributions must be maintained. Such filters as Nuclepore polycarbonate plastic membranes and Millipore cellulose membranes have pore clogging and disintegration problems but are effective in limiting grain-size distribution alterations.

Sediment, Suspended, Suspended sediment

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Investigation of a sequential filtration technique for particle fractionation

Article Abstract:

The ability of the sequential filtration method to separate a sediment suspension into the desired size fractions was evaluated. The results showed that the method yields inaccurate fractionation of primary inorganic sediment since filters retain sediment particles both less than and greater than the desired sediment size. The sequential nature of the method further magnifies the error for successively smaller size fractions.

Analysis, Evaluation, Lake sediments

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