GB/T 27404-2026 Criterion on quality control of laboratories—Chemical testing of food

GB/T 27404-2008 Criterion on quality control of laboratories—Chemical testing of food

GB/T 1.1-2000 Directives for standardization—Part 1:Rules for the structure and drafting of standards (ISO/IEC Directives, Part 3,1997,Rules for the structure and drafting of international standards, NEQ) GB/T 1.1-2009 Directives for standardization—Part 1:Structure and drafting of standards GB/T 1.1-2020 Directives for standardization—Part 1:Rules for the structure and drafting of standardizing documents 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 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 20001.4-2001 Rules for drafting standards—Part 4:Methods of chemical analysis GB/T 20001.4-2015 Rules for drafting standards—Part 4:Test method standards GB/T 27025-2019 General requirements for the competence of testing and calibration laboratories GB/T 27043-2012 Conformity assessment—General requirements for proficiency testing GB/T 27043-2025 Conformity assessment—General requirements for the competence of proficiency testing providers GB/T 27417-2017 Comformity assessment—Guidance on validation and verification of chemical analytical methods GB/T 27418-2017 Guide to the evaluation and expression of uncertainty in measurement JJF 1059.1-2012 Evaluation and Expression of Uncertainty in Measurement GB/T 602-2026 Chemical reagent—Preparations of standard solutions for impurity