GB/T 6730.44-2017 Iron ores—Determination of zinc content—1-(2-pyridylazo)-2-naphthol spectrophotometric method

GB/T 6730.3-2017 Iron ores—Determination of hygroscopic moisture in analytical samples—Gravimetric,Karl Fischer and mass-loss methods GB/T 6730.14-2017 Iron ores—Determination of calcium content—Flame atomic absorption spectrometric method GB/T 6730.26-2017 Iron ores—Determination of fluorine content—Thorium nitrate titrimetric method GB/T 6730.27-2017 Iron ores—Determination of fluorine content—Lanthanum-alizarin complexion spectrophotometric method GB/T 6730.30-2017 Iron ores—Determination of chromium content—Diphenyl carbazide spectrophotometric method GB/T 6730.31-2017 Iron ores—Determination of vanadium—N-benzoyl-N-phenylhydroxylamine extraction spectrophotometric method GB/T 6730.34-2017 Iron ores—Determination of tin content—Pyrocatechol violet cetyl trimet hylamine bromide spectrophotometric method GB/T 6730.37-2017 Iron ores—Determination of cobalt content—4-[(5-chloro-2-pyridyl)azo]-1,3-diamino-benzene spectrophotometric method GB/T 6730.38-2017 Iron ores—Determination of cobalt content—Nltroso-R salt spectrophotometric method GB/T 6730.39-2017 Iron ores—Determination of nickle content—Dimetylglyoxime spectrophotometric method GB/T 6730.42-2017 Iron ores—Determination of lead content—Dithizone spectrophotometric method GB/T 6730.47-2017 Iron ores—Determination of niobium content—Sulfochlorophenol S spectrophotometric method GB/T 6730.49-2017 Iron ores—Determination of potassium content—Flame atomic absorption spectrometric method GB/T 6730.58-2017 Iron ores—Determination of vanadium content—Flame atomic absorption spectrometric method GB/T 6730.59-2017 Iron ores—Determination of manganese content—Flame atomic absorption spectrometric method GB/T 6730.74-2017 Iron ores—Determination of magnesium content—Flame atomic absorption spectrometric method GB/T 6730.75-2017 Iron ores—Determination of sodium content—Flame atomic absorption spectrometric method GB/T 6730.76-2017 Iron ores—Determination of potassium,sodium,vanadium,copper,zinc,lead,chromium,nickel,cobalt elements—Inductively coupled plasma optical emission spectrometry

GB/T 6730.44-1986 Methods for chemical analysis of iron ores The 1-(2-pyridylazo)-2-naphthol photometric method for the determination of zinc content

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 6730.1-1986 Methods for chemical analysis of iron ores—Preparation of predried test samples for chemical analysis GB/T 6730.1-2016 Iron ores—Preparation of predried test samples for chemical analysis GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 10322.1-2000 Iron ores—Sampling and sample preparation procedures GB/T 10322.1-2014 Iron ores—Sampling and sample preparation procedures GB/T 10322.1-2023 Iron ores—Sampling and sample preparation procedures GB/T 12806-1991 Laboratory glassware—One-mark volumetric flasks GB/T 12806-2011 Laboratory glassware—One-mark volumetric flasks GB/T 12807-1991 Laboratory glassware—Graduated pipettes GB/T 12807-2021 Laboratory glassware—Graduated pipettes GB/T 12808-1991 Laboratory glassware—One-mark pipettes GB/T 12808-2015 Laboratory glassware—One mark pipettes