Kelso, Washington Laboratory Method information displayed is provided for informational purposes only. No warranty express or implied is made as to the website accuracy, completeness, or applicability such as the age of a method and whether or not it applies to your project. Please contact us for assistance. Summary: Organic compound analytes, internal standards, and surrogates are extracted from a 1L sample by passing it through a disk or cartridge containing a solid matrix with a chemically bonded C18 organic phase [liquid-solid extraction LSE ]. Organic compounds are extracted from the LSE with small quantities of ethyl acetate followed by methylene chloride with further evaporation of the solvent. Scope: This method provides procedures for the determination of a wide range of organic compounds found in finished drinking water, source water, or drinking water in any treatment stage.

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Since the method states "less than a pH of 2" most of our collectors overkill on the HCl. We adjust the QC to match the samples which are always more like than 2. That could be the problem.

I am having a little less recovery with the other PAHs, but Anthracene is definately being oxidized because I can see the anthraquinone on the MS.

My dperylene along with the benzo a pyrene is also a major problem. Please add to the discussion any other ideas you may have. EPA One thing you may notice if the pH is too low is that you can lose your Deuterated surrogates.

I have seen instances where one would be low and when you look at the spectra you see ions for the d12, d11, d10, d9 ect analogs all coming off together in a broad peak. It turned out to be the lights.

So we installed less intensive lights and tried to do the extraction in the dark as much as possible which solved our problem. We have had some problems with recoveries when doing PAH by EPA so I may look into having less exposure to light and see if that helps ours, thanks. Avoid sample contact with PE.


EPA Method 525.2




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