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Sample Preparation - Filter papers for EPA Method 353.2

 
We've experienced some trouble while running nitrate (NO3) by automated colorimetry using EPA Method 353.2. There seemed to be an interference from the filter paper that results in a false positive. We've noticed that the false positive was not seen when analyzing for NO2. The filter paper used is Whatman filter paper 541 - Hardened Ashless. Is there a more appropriate filter paper?
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Edward james Total posts: 1

This Nitrate sample preparation is basically used in Ion chromatography and it is very important to have basic knowledge of these chemicals to do experiments. I had economics assignment help which can help you to do your college tasks and it is the best way to avoid hassle of submission deadlines.

Posted: 10/18/21 14:22:28
admin Total posts: 529

Unfortunately, EPA Method 353.2 does not specify the type of filter paper to use. We suggest a syringe filter paper that is certified for low ionic background levels. Since it is used for Ion Chromatography applications, it will not contribute nitrate contamination. This filter paper should be used for aqueous samples only. It comes in a polypropylene housing with Luer fittings. These filters are available from large commercial lab and chemical supply companies.

Posted: 09/07/18 01:51:18

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