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      Why is EPA Method 549.2 a Challenging Method?

      November 11, 2021 at 8:00 AM / by Deanna Bissonnette posted in Drinking water, diquat, paraquat, epa 549.2

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      When I first saw EPA Method 549.2 only had two compounds, I said to myself: “WOW! That’s a breeze! Only two compounds to worry about, so it can’t be that difficult to extract!” Seeing as I was used to the methods with 100+ compounds to worry about, naturally, I would believe this at first glance. However, I was severely mistaken…these two compounds are far from easy to recover from a water sample. To be successful with EPA Method 549.2, you need to make sure you have the right chemistries taking place in order to recover these compounds well or even at all.

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