What data do I require to measure the Uncertainty of purity for CRM?

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Ramin Boroujerdi

This article might be helpful for you :

http://link.springer.com/article/10.1007%2Fs007690050274#

(Consideration of the uncertainty in the CRM value with the analysis of solid materials using atomic spectrometry)

Can Quan

There're many ariticles:

http://jat.oxfordjournals.org/content/33/8/532.full.pdf

Article Development of anabolic-androgenic steroids purity certified...

Kevser Topal

This certification report may help

https://rm.ume.tubitak.gov.tr/sertifika/ume_crm_1301_certification_report.pdf