Hello. When diluting this standard for use with EPA 7473 method should it be diluted with 2% HNO3 or another preservative? How long is it stable at that point? Thank you.

The mercury standard has a 2% HNO3 matrix. I would keep the matrix 2% HNO3 with any and all dilutions that you make to keep everything consistent. These dilutions are considered working standards and should be made fresh daily.

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