Improvements in Processing Drinking Water Samples by Method 525, Part 1 Sample Preservation

Since its release in 1995, EPA method 525.2 has been one of the most widely used methods for quantifying semi-volatile compounds in drinking water.  Chances are, if you work for or own a drinking water lab, you probably analyze for compounds in this method – at the very least, you’re probably at least familiar with the method.  This is a widely accepted method for quantifying semi-volatile organic compounds; however, there are some glaring issues with the method that the EPA has recognized and addressed.  These changes have been collected and implemented in a new revision – Method 525.3 – which was published in 2012.  Method 525.2 is still more frequently used by laboratories processing drinking water samples; however, I would argue that Method 525.3 is more scientifically sound.  In this 2-part blog series, I will address multiple aspects of Method 525.2 that have been modified to improve the collection, preservation, and processing of drinking water samples.  In this first part, I will focus on the improvements that have been made with respect to the sample preservation process.

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