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NTIA-07025 KeMApplication Note Petroleum Acid number of Bio Diesel (BDF) Automatic Potentiometric TitratorAcid-base titration (non aqueous) JIS K 2501 IP 177 Standards ASTM D 664 GOST 29255 ISO 6619 1. Abstract Quality control of bio diesel fuel (BDF) on acid number is important since thenumber increases when the fuel itself deteriorates or BDF in production in line is notconforming. The acid number of BDF is measured according to JIS, ASTM or ISO standards bypotentiometric titration with 0.lmol/L potassium hydroxide 2-propanol solution untilthe endpoint is found on titration curve. The acid number of bio diesel fuel is calculated from the titration volume ofpotassium hydroxide 2-propanol solution consumed in reaching the endpoint. 2.Reference 1))JIS K 2501 Test Method for Neutralization number-Petroleum productsand lubricants 2)ASTM D 664 Standard Test Method for Acid Number of Petroleum Productsby Potentiometric Titration 3)ISO 6619 Petroleum products and lubricants-Neutralization number-Potentiometric Titration method 3. Cautions in measurement 1))Repeated measurement lowers sensitivity of glass electrode, and thus requiresregeneration process for the electrode each time a measurement is finished.To regenerate the electrode, dip it in an alcohol solution once for cleaning, andthen dip it in pure water for 10 ~ 60 min. (depends on how much contaminated)2) The standard concentration of potassium hydroxide 2-propanol solution is0.0005mo1/L or less.8.Adjust it to the standard level from time to time. 4.Post-measurement care After a series of measurements for the day is over, be sure to regenerate theelectrode once for all according to the preceding“3. Cautions in measurement”. 5. System configuration Main unit: Automatic potentiometric titrator (preamplifier: STD) Electrodes: (* mark shows standard supplied item) * Glass electrode H-171[No 98100H171] * Reference electrode R-173 N 98100R173 (Junction liquid:3.33M-potassium chloride solution) * Temperature compensation electrode T-171 LN 98100T171] 6.Reagent Reagent:0.lmo1/L Potassium hydroxide 2-propanol solution (f=1.000) Mixed solvent: Toluene : Water : 2-propanol(500:5:495) 7.Measurement procedure -Pretreatment- 1) Transfer 120mL mixed solvent to a 200mL beaker. 2) Perform a blank test, and obtain the blank level. Measurement- 1)Transfer approx.20g sample liquid to a 200mL beaker. 2)Add 120mL mixed solvent. 3)Titrate with 0.lmo1/L potassium hydroxide 2-propanol to obtain acid number. 8.Formula Total oxidation (mg/g) = (EPl- BLl)×TF×Cl×K1/ SIZE EPl Titration volume(mL) BLl Blank level(0.00mL) TF Reagent factor (1.00) Cl Concentration conversion coefficient (56.1 g/mL) (equivalent to potassium hydroxide in 1mL of 1mo1/L potassium hydroxide2-propanol solution) KI Unit conversion coefficient (0.1) SIZE Sample size (g) 9. Example of measurement -Ambient condition- Room temperature : 24 ℃ Humidity : 78% Weather : Rain (The below data and titration curve are printed out when titrated by AT-510 unit.) -Titration parameter- -Titration curve- Model : AT-510 Serial No. : NZB52534 Method No. : 01 Titr.mode :Auto Intermit Titr. form : EP Stop [Titration parameter」 Form : EP StopAPB No. :1Unit No. :1Detector No. :1Unit : pHMax.Volume :220.0mLWait Time :0sDirection : Auto [Control parameter] End Point No.:: 1End sense : AutoEnd Point Area :OffSeparation : OffOver Titr.Vol. :0mLGain :1Data samp. Pot. : 4.0mVData samp.Vol. : 0.5mLStability : 0.5mV/sDelay Time :00sLimit Time :330s [Result parameter]
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