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Settleable Solids Testing
Jun 23^rd, 2010, 11:40am

I work in an Environmental Testing Lab and we frequemtly get in sludge samples for Settleable Solids testing from water companies. We have tried to explain that this test is not designed for such matrices, but they keep requesting it anyway.

Does anyone know of a site where I could find a reference to the limitations of perfoming this test on a sample of say pond sediment. I would like to refer my clients to it.

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David S. Senior Member Offline I have nothing clever to say here. Posts: 373 Gender: Company or Organization: Environmental Express	Re: Settleable Solids Testing Reply #1 - Jun 24^th, 2010, 8:45am Standard Methods, in 2540F 1., discusses settleable solids. "Settleable solids in surface and saline waters as well as domestic and industrial wastes may be determined and reported on either a volume (mL/L) or a weight (mg/L) basis.
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Helen Geoghegan YaBB Newbies Offline I love Water and Wastewater.com Posts: 2 Company or Organization: CTL, Inc.	Re: Settleable Solids Testing Reply #2 - Jun 28^th, 2010, 3:53pm it does specifically address how to do settleable solids on a sludge though - like something with 7% solids where when you pour the sample into a cylinder, you can't see the water column - the particles are very fine. Some settling may occur but impossible to read.
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sobisch God Member Offline Posts: 1777 Gender: Company or Organization: L.U.M. GmbH	Re: Settleable Solids Testing Reply #3 - Jun 29^th, 2010, 12:59am Dear Helen Geoghegan, though standard settling test at earth gravity is not feasible you might do a characterization in graduated centrifuge tubes at defined centrifugation time and acceleration. Kind regards T. Sobisch
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Jeff Naumann

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Re: Settleable Solids Testing
Reply #4 - Jun 29^th, 2010, 6:30am

Helen Geoghegan wrote on Jun 23^rd, 2010, 11:40am:

I work in an Environmental Testing Lab and we frequemtly get in sludge samples for Settleable Solids testing from water companies. We have tried to explain that this test is not designed for such matrices, but they keep requesting it anyway.

Does anyone know of a site where I could find a reference to the limitations of perfoming this test on a sample of say pond sediment. I would like to refer my clients to it.

It is not unusual for regulatory agencies to require tests for parameters that might NOT make sense given the sample matrix. In California, for instance, the level of common sense of regulatory personnel is (unfortunately) not increasing.

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