Methods for chemical analysis of lithium carbonate,lithium hydroxide monohydrate and lithium chloride—Part 3:Determination of lithium chloride content—Potentiometric method
Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 3: Determination of lithium chloride content - Potentiometric method
1 Scope
This part of GB/T 11064 specifies the methods for determination of lithium chloride content in lithium chloride.
This part is applicable to the determination of lithium chloride content in lithium chloride, within a range of over 95.00%.
2 Method summary
The test portion is dissolved in water for titration of chloride by silver nitrate standard solution in acid solution, with silver (or silver-silver sulfide) electrode as measuring electrode and calomel electrode as reference electrode. The end point of the reaction is determined by the second-order derivative, and the content of lithium chloride is calculated by the consumption of silver nitrate standard volumetric solution.
3 Reagents
Unless otherwise specified, analytical reagents and deionized water shall be used for the purpose of this part.
3.1 Nitric acid (1+1): guaranteed reagent.
3.2 Bromophenol blue ethanol solution (1g/L).
3.3 Sodium chloride standard solution [c(NaCl)=0.100 0mol/L]: Weigh 5.844 3g sodium chloride (standard reagent) that has been ignited at 450~500℃ for 1.5h and cooled to room temperature in a dryer, put it into a 250mL beaker, after dissolving it in water, transfer the solution into a 1,000mL volumetric flask, dilute to the scale with water and shake well.
3.4 Silver nitrate standard volumetric solution: [c(AgNO3)=0.100 0mol/L].
3.4.1 Preparation: Weigh 17.0 silver nitrate and put it in a 250mL beaker, dissolve with water, then transfer into a 1,000mL brown volumetric flask, dilute to the scale with water
Foreword i
1 Scope
2 Method summary
3 Reagents
4 Apparatus
5 Specimen
6 Analysis steps
7 Calculation of analysis result
8 Precision
9 Test report
Annex A (Informative) Examples of test record format
