GB/T 16399-2021 Methods for chemical analysis of clay

GB/T 16399-1996 Method for chemical analysis of clay

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 15000.1-1994 Directives for the work of reference materials(1) General rules for description of reference materials in technical standards GB/T 15000.2-1994 Directives for the work of reference materials(2) The common terms and definitions of reference materials GB/T 15000.2-2019 Directives for the work of reference materials—Part 2:Selected terms and definitions GB/T 15000.3-1994 Directives for the work of reference materials(3) General principles and statistic methods for certification of reference materials GB/T 15000.3-2008 Directives for the work of reference materials(3)—Reference materials—General and statistical principles for certification GB/T 15000.3-2023 Directives for the work of reference materials—Part 3:Reference materials—Characterization and assessment of homogeneity and stability GB/T 15000.4-2003 Directives for work of reference materials(4)—Contents of certificates and labels GB/T 15000.4-2019 Directives for the work of reference materials—Part 4:Contents of certificates,labels and accompanying documentation GB/T 15000.5-1994 Directives for the work of reference materials(5)—Technologic rules for reference materials of chemical composition GB/T 15000.5-2023 Directives for the work of reference materials—Part 5:The in-house preparation of quality control materials(QCMs) GB/T 15000.6-1996 Directives for the work of reference materials(6)—General rules for package of certified reference materials GB/T 15000.7-2001 Directives for the work of reference materials(7)—General requirements for the competence of reference material producers GB/T 15000.7-2012 Directives for the work of reference materials (7)—General requirements for the competence of reference material producers GB/T 15000.7-2021 Directives for the work of reference materials—Part 7:General requirements for the competence of reference material producers GB/T 15000.8-2003 Directives for the work of reference materials(8)—Uses of certified reference materials GB/T 15000.8-2023 Directives for the work of reference materials—Part 8:Good practice in using reference materials GB/T 15000.9-2004 Directives for the work of reference materials(9)—Calibration in analytical chemistry and use of certified reference materials JJF 1343-2012 General and Statistical Principles for Characterization of Reference Materials JJF 1343-2022 Characterization,Homogeneity and Stability Assessment of Reference Materials GB/T 15000.4-2026 Directives for the work of reference materials—Part 4:Contents of certificates,labels and accompanying documentation GB/T 15000.9-2026 Directives for the work of reference materials—Part 9:Approaches for the production of reference materials with qualitative properties