This is a product of the United States Pharmacopoeia. It is intended for use as an analytical standard. Please see the link below to review the supplier product information:
https://store.usp.org/product/1290002
No additional testing is performed on this product in solution. To discuss further we kindly ask you to navigate to the link https://www.sigmaaldrich.com/techservice, click on "Product Technical Inquires" under the Products Section with all the required information so that a member of our team can reach out to you to assist further. Thank you.