Abstract
The extent of filtrate contamination with major cations. Si, TDP and TDN from Sartorius and Millipore membrane filters and Gelman, Sartorius and Whatman glass fibre filters was determined. Millipore membranes and the Sartorius cellulose nitrate membranes, when not washed before use, caused significant TDN contamination of filtrate, and Sartorius and Gelman glass fibre filters caused contamination of filtrate with sodium ion. Carbon and nitrogen in ignited and unignited glass fibre filters were measured, and ignition of filters before use was found essential for accurate determination of carbon and nitrogen in particulate matter of most fresh waters.
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