WEF Discussion Forums : Laboratory Management and Technical Issues : Membrane filters What membrane filters are any of you using for filtering samples for low level ion chromatography analysis. We filter groundwater and alpine surfacewater samples. We test for the following anions at the listed reporting limits. We do not want any leachates from the filters that would exceed 1/5 the reporting limits.
     
              Detection

                 Limit
     Anion     mg/L    
     Fluoride    0.05
     Chloride    0.5
     NO2-N      0.01
     NO3-N      0.01
     Bromide    0.01
     PO4-P      0.01
     Sulfate     0.5

Terry Powers
South Tahoe PUD 


]]> Mon, 19 Nov 2012 01:36:51 GMT Terry,

 

Sorry for being so late in replying.  We use ordinary Acrodisc from Pall Filters.  We do a filter blank with every run and have had no problems in quite a few years.  Our detection limits are just a little higher than those on your list.

 

Chuck Lytle,

City of Portland, OR


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