Frequent Questions

Do Methods 524.2 and 524.3 entail the usage of a four minute desorb?

• Method 524.2 is the older approved method for VOC analysis. It is a prescriptive method with defined purge-and-trap parameters. Unfortunately, one parameter is worded vaguely. The method states that desorption should be ‘about 4 minutes’. Bottom line, with this method, labs are expected to hold their desorb time to 4 minutes. There is no option to change that.

•Method 524.3 was developed and approved as an alternate method to 524.2. It offers a wide range of flexible options for purge-and-trap parameters, including variable desorb times. There is no required 4 minute desorb in Method 524.3.

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