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  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titrationAPPENDIX(Nonmandatory Information)X1. CHECK FOR ELECTRODE PERFORMANCEX1.1 The kinetic electrode test measures the kinetic response of the electrode. Electrodes can calibrate with ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration14. Report14.1 Given there are two different ways to determine the endpoint, report the type of endpoint used: inflection point or buffer endpoint. Report sample size used if differs ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration13. Quality Control Checks13.1 Confirm the performance of the test procedure by analyzing a quality control (QC) sample that is, if possible, representative of the samples typically ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration12. Calculation12.1 Manual Titration - Plot the volumes of the 0.1-mol/L alcoholic KOH solution added against the corresponding meter readings (see Fig. 1). Mark as an end point only ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration11. Procedure for Acid Number and Strong Acid Number11.1 Into a 250-mL beaker or a suitable titration vessel, introduce a weighed quantity of sample as recommended in Table 1 (see ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration9. Standardization of Apparatus9.1 Determination of Meter Readings for the Aqueous Buffer Solutions - To ensure comparable selection of end points when definite inflection points ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration8. Electrode System8.1 Preparation of Electrodes:8.1.1 When a Ag/AgCl reference electrode is used for the titration and it contains an electrolyte which is not 1M–3M LiCl in ethanol, ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration7. Reagents7.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration6. Apparatus6.1 Manual Titration Apparatus:6.1.1 Meter, a voltmeter or a potentiometer that will operate with an accuracy of more or less 0.005 V and a sensitivity of more or less ...
  • ASTM D664 for acid number of petroleum products ASTM D664 for acid number of petroleum productsASTM D664 for acid number of petroleum products by potentiometric titration3. Terminology3.1 Definitions:3.1.1 acid number, n-the quantity of base, expressed as milligrams of potassium hydroxide per gram of sample, required to titrate a sample in a specified ...