water quality

Charles N. Haas HaasCN at Dunx1.ocs.drexel.edu
Tue Mar 21 07:46:57 EST 1995


In article <5A05EB65AC8 at microb.umd.edu>, ASMITH at MICROB.UMD.EDU ("Ann C.
Smith") wrote:

> Dear All
> An undergraduate has just approached me requesting to test water 
> samples for a local environemtal group.  I am familiar with the 
> basics of testing for fecal coliforms, but I have never applied the 
> technque in the real world.  Which is considered the most reliable - 
> the filtration technique with cultivation of filter in MF-endo media 
> or the traditional MPN technique followed by plating of samples on 
> EMB agar?


You can buy pre-prepared "distick" testers from a variety of companies
(e.g., Millipore); then all you need is an incubator.  The incubator
needed for fecal coliforms must be tightly controlled (generally a water
bath is used.  Therefore, I would recommend that you might look at total
coliforms.

> 
> He also is interested in testing for dissolved nitrogen and 
> phosphorous.  Any suggestions for methods to detect these?
> Thanks!
> Ann

Get a catalog from Hach Chemical Co., Loveland CO -- they manufacture a
variety of quite simple test kits for various water quality parameters.

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from the keyboard of:         Charles N. Haas:LD Betz Professor of Environmental Engineering
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