So these prep HPLC and qNMR standards are tested as an absolute standard using spectroscopy?I might have said that it is one way to do it - hell, even I did that, many years ago, but that is not the correct way to do it, as errors as per the above (using impure raw as standard) can happen. Nowadays I either purchase most standards officially or have samples standardized via prep-HPLC and qNMR.
Yep. Basically, you need massive throughput or you'd have massive costs.
That's why there is no lab that does both everything and for a reasonable price. Once you reach certain throughput with a specific kind of samples, though, it's just economies of scale.
You can order standards from steraloids, certiliant, etc, for most of the common AAS, that is no problem. Only thing you need for that is a license to handle scheduled products.
Do you need a license to handle these high quality standards.
Is this what you normally use as your standards.
Are these standards produced by a western company?