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A bout working standard

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Hi, colleagues.
There are some questions need you help.Please give me some information.
1,Is there any difference between working standard and secondary standard?
2,"Analytical procedures used to characterize a reference standard should not rely solely on comparison testing to previously designated reference standard." Taken from FDA guidance.So,what analytical procedures used to characterize a reference standard are acceptable?
3,How do I prepare the SOPs of reference standard characterization?
Thank you advanced.

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