GB/T 47215-2026 Determination of ammonia volatilization from soil

GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 4883-1985 Statistical interpretation of data—Detection and handling of outlying observations in normal sample GB/T 4883-2008 Statistical interpretation of data—Detection and treatment of outliers in the normal sample 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 18204.2-2000 Methods of microbiological examination for tea set in public places—Determination of aerobic bacterial count GB/T 18204.2-2014 Examination methods for public places—Part 2:Chemical pollutants GB/T 18204.2-2025 Examination methods for public places—Part 2:Chemical indicators HJ 666-2013 Water quality: Determination of ammonia nitrogen by flow injection-salicylate spectrophotometry