Inorganic Ventures' 1000 ppm Selenium+4 for ICP is a certified reference material set in a nitric acid matrix for stability. This selenium+4 standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date . …

Inorganic Ventures' 1000 ppm Selenium+6 for ICP is a certified reference material set in a water (tr. nitric acid) matrix for stability. This selenium+6 standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date . …