Why are metals filtered through a 0.45 micron filter?

Modified on: Wed, 13 Feb, 2019 at 1:33 PM

A filter size of 0.45 microns effectively removes particulate matter from a sample of water that may otherwise impact analytical results, yet allowing for a large enough mesh size so appropriate volumes of water are filtered within a reasonable time (referring to waters that contain large quantities of suspended particulates). 

In addition, the optimum size for mobility of particles in ground is approximately 1um, meaning that a 0.45um filter is an adequate size filter.

For more detail on the use of filters for Groundwater sampling, the Connecticut Department of Energy and Environmental protection provides a thorough explanation here

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