Abstract
The filter papers listed under the method for extract determination, 4.4 Extract, in Analytica IV have been tested in order to reveal if the type of filter paper has any effect on the analytical results. The data received from ten participating laboratories indicate that the standard deviations of the analytical results are somewhat dependent upon the type of filter paper used. The four filter papers tested gave substantial variations in speed of filtration. The results indicate that the type of filter paper to be used must be specified in collaborative tests. It is recommended that section 4.4 and 4.4.3 should be re-evaluated.
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