*CWA Sulphide In Water, Formal Pt Study, April 15 - May 30 7028-AA This Certified Reference Material at

This Certified Reference Material at a concentration of 10 µg/mL in 2-5% Nitric Acid is composed of 7 analytes

This Certified Reference Material at a concentration of 2

0 mg/mL in Methanol is composed of 9 analytes

This Certified Reference Material of varied concentration in 10% Hydrochloric acid

*CWA Sulphide In Water, Formal Pt Study, April 15 - May 30 7028-AA This Certified Reference Material atAbsolute Standards is ISO 17043, ISO 17025, ISO Guide 34 Certified for PT Standard production Listed as a CALA Approved PT Supplier Double Blind PT Studies: Contact tech@chromspec. com for beginning and end dates for each year.