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Dear NIST Standard Reference Material Customer:
This letter is to notify the users and purchasers of NIST SRM 2787 Fine Atmospheric Particulate Matter
(Mean Particle Diameter < 10 µm) of the revised Certificate of Analysis (COA) dated 02 July 2021. This revision includes the following changes:- updated expiration date
- changed nitro-PAHs certified values to non-certified values due to incomplete stability testing from lack of appropriate purity assessed calibrants
- converted all other measurands previously labeled as reference or information values to non-certified values
- editorial changesDear NIST Standard Reference Material Customer:
This letter is to notify the users and purchasers of NIST SRM 2787 Fine Atmospheric Particulate Matter (Mean Particle Diameter < 10 µm) of the revised Certificate of Analysis (COA) dated 02 July 2021. This revision includes the following changes:- updated expiration date
- changed nitro-PAHs certified values to non-certified values due to incomplete stability testing from lack of appropriate purity assessed calibrants
- converted all other measurands previously labeled as reference or information values to non-certified values
- editorial changes
