GB/T 12592-1990 Chemical reagent—Bromophenol Blue

GB 619 HG 3-119 GB/T 603-2002 Chemical reagent—Preparations of reagent solutions for use in test methods GB/T 603-2023 Chemical reagent—Preparations of reagent solutions for use in test methods GB/T 604-2002 Chemical reagent—General method for the determination of pH ranges corresponding the colour transition of acid-base indicators GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 9721-1988 Chemical reagent General rules for the molecular absorption spectrophotometry(ultraviolet and visible) GB/T 9721-2006 Chemical reagent—General rules for the molecular absorption spectrophotometry (ultraviolet and visible)