This standard specifies preparation and calibration method of chemical reagent reference titration solution.
This standard is applicable to both preparation and calibration of reference titration solution whose chemical reagent purity and impurity content is determined by titration and other areas.
2 Normative References
The following documents for the application of this document are essential. For dated reference, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test Method
GB/T 606 Chemical Reagent - General Method for the Determination of Water - Karl Fischer Method
GB/T 6379.6-2009 Accuracy(trueness and precision) of Measurement Methods and Results - Part 6: Use in Practice of Accuracy Values
GB/T 6682 Water for Analytical Laboratory Use-Specification and Test Methods
GB/T 9725-2007 Chemical Reagent - General Rule for Potentiometric Titration
JJG 130 Verification Regulation of Liquid-in-Glass Thermometers for Working
JJG 196-2006 Verification Regulation of Working Glass Container
JJG 1036 Verification Regulation for Electronic Balance
3 General Requirements
3.1 Unless otherwise specified in this standard, the analytically pure level and above reagents, preparations and products prepared according to GB/T 603 and Grade 3 water (defined in GB/T 6682) shall be adopted for the purpose of this standard.
3.2 The concentration of reference titration solution prepared in this standard refers to that at 20℃ except perchloric acid reference titration solution, hydrochloric acid-ethanol reference titration solution and sodium nitrite reference titration solution [c(NaNO2)=0.5 mol/L]. If calibration, direct preparation and use of reference titration solution is not conducted at 20℃, volume of shall be corrected (see Annex A). Reference titration solution with "calibration prior to use" may not be corrected in case of not large temperature difference during calibration and use. Calibration, direct preparation and analytical balance, burette, one-mark volumetric flask and one-mark pipet for use shall be verified or calibrated periodically according to relevant verification regulation and determination method of burette volume is performed according to Annex B. Besides, one-mark volumetric flask and one-mark pipet shall be provided with volume correction factor.
