what is purity expectation for primary reference standard

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what is purity expectation for primary reference standard

: jiangds06

: Posts: 206; Joined: Sun Oct 09, 2011 5:08 pm

by jiangds06 » Wed Apr 01, 2015 2:54 pm

what is the specification for the primary reference standards for analytical study?

Re: what is purity expectation for primary reference standar

: Alfred88

: Posts: 193; Joined: Thu May 11, 2006 11:10 pm

by Alfred88 » Thu Apr 02, 2015 6:26 am

For USP RS, the purity is 100%, unless stated differently, such as 99% (or purity factor 0.99).
Check the latest USP catalog for the relevant info for current/valid lots and purity.

Re: what is purity expectation for primary reference standar

: jiangds06

: Posts: 206; Joined: Sun Oct 09, 2011 5:08 pm

by jiangds06 » Mon Apr 06, 2015 12:14 pm

how it could be possible 100%?

For USP RS, the purity is 100%, unless stated differently, such as 99% (or purity factor 0.99).
Check the latest USP catalog for the relevant info for current/valid lots and purity.

Re: what is purity expectation for primary reference standar

: Fernando

: Posts: 115; Joined: Tue Apr 19, 2005 12:36 pm

by Fernando » Mon Apr 06, 2015 2:48 pm

Hi jiangds06

I think that the number its really not very important (for sure there are primary stds of 95,0 % or less) but the most important thing is the certificate of analysis that accompany that PS (for example USP)

Best luck

Fernando

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