GB/T 1871.5-2022 Determination of magnesium oxide content for phosphate rock and concentrate—Flame atomic absorption spectrometry,volumetry and inductively coupled plasma optical emission spectrometry

GB/T 1871.5-1995 Phosphate rock and concentrate—Determination of magnesium oxide content—Flame atomic absorption spectrometric and volumetric methods

GB/T 1871.1-1995 Phosphate rock and concentrate—Determination of phosphrous pentoxide content—Quinoline phosphomolybdate gravimetric and volumetric methods GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 602-2002 Chemical reagent—Preparations of standard solutions for impurity 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 1868-1995 Phosphate rock and concentrate—Methods of sampling and preparing sample GB/T 6003.1-1997 Test sieves of metal wire cloth GB/T 6003.1-2012 Test sieves—Technical requirements and testing—Part 1:Test sieves of metal wire cloth GB/T 6003.1-2022 Test sieves—Technical requirements and testing—Part 1:Test sieves of metal wire cloth 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 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 9723-2007 Chemical reagent—General rule for flame atomic absorption spectrometric analysis JY/T 0567-2020 LCP-ICP-OES method general principles for analysis JY/T 0567-2020 GB/T 602-2026 Chemical reagent—Preparations of standard solutions for impurity