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NTIB-99307 keM Application Note Fat and Oil Saponification value of Fat and Oil Acidbase titration (non aqueous) by Automatic Potentiometric Titrator Standard Test MethodJIS K0070 for Fat and Oil Standard ASTM D 5558 ISO 3657 1.Abstract Saponification value is expressed by potassium hydroxide in mg required to saponifyone (1) gram of fat. It depends on the kind of fatty acid contained in the fat.Measurement of saponification value is performed according to the below listedofficial test methods. Here we test a sample of fatty acid. The sample is first saponified by adding0.5mol/L potassium hydroxide ethanol, and then the excessive potassium hydroxideis titrated with 0.5mol/L hydrochloric acid until the endpoint is reached.EP is determined by the maximum inflexion point on titration curve. 2.Reference 1) JIS K 0070 Test Method for Acidity, Saponification value, Ester value,Iodine value and Hydroxy value of Chemical products and Unsaponifiables 2))ASTM D 5558 Standard Test Method for Determination of the SaponificationValue of Fats and Oils 3)ISO 3657 Animal and vegetable fats and oils-Determination ofsaponification value 4)Method (I) 3.3.2 Saponification Value from Standard Test Method for Fatand Oil by Japanese Oil Chemistry Society 3.Cautions in measurement 1)When the sample is heated in flask for saponification, gently heat it so thatbackflow ethanol will not reach the top of cooling pipe fitted to the flask. 2)Replace junction liquid of reference electrode with saturated sodium perchlorateacetic acid. ( 上海市漕溪路222号航天大厦北楼902室 ) 4.Post-measurement care After the electrode is rinsed with water, keep the tip of electrode dipped in purewater for storage. 5.Test equipment Main unit:Automatic potentiometric titrator (Standard preamplifier STD-)Electrode:Standard Combination glass electrode (Change junction liquid to saturated sodium perchlorate aceticacid) 6.Reagent Reagent 0.5mol/L Hydrochloric acid (f=1.006) Reagent 0.5mol/L Potassium hydroxide· Ethanol 7.Measurement procedure 一Measurement- Deliver 1.5 to 2.0g sample into a 200mL conical flask. Add 25.0mL of 0.5mol/L potassium hydroxide Ethanol, and fix a cooling pipe tothe flask. 3))Gently heat the flask occasionally shaking while adjusting the heat so thatbackflow ethanol will not reach the top of cooling pipe. 4)After heated for 30 minutes, immediately cool it, and titrate with 0.5mol/L HClbefore the test liquid is solidified. 5)Perform blank test (without sample following step 1 to 4 above) for 3 times toobtain mean value of titration volume of 0.5mol/L hydrochloric acid. 8.Formula Saponification value (mg/g)=(BLl- EPl)×TF×Cl×K1/SIZE EPI Titration volume (mL) BLI Blank level (25.029mL) Reagent (HCl) factor (1.006) concentration conversion coefficient (28.05 mg/mL) (Potassium hydroxide in Eq.:56.11×0.5) Kl Unit conversion coefficient (1) SIZE Sample size(g) ( 上海市漕溪路222号航天大厦北楼902室 ) 9.Example of measurement -Ambient condition一 Room temperature :22.5℃ Humidity: 47% Weather : Cloudy -Titration parameter- Titration curve- Model :AT-510 Method No. : 12 Titr.mode : Petroleum Titr.Titr.form: EP Stop [Titration parameter] Form : EP Stop APB No. :1 Unit No. :1Detector No. :1Unit :mVMax.Volume 20.0mLWait Time :660s Direction : Auto [Control parameter] End Point No. : 1End sense : AutoEnd Point Area : OffSeparation :Off Over Titr.Vol. :0.0mLGain :: 1Data samp.Pot.: 4.0mVData samp.Vol.:0.05mLIntegral Time : 60sStart Lim.Time: OsLimit Time :C0s1st Volume : 0.1 mL 2nd Volume ::0.05mL Stability : 5 mV/min dE(1st-2nd) : 30mV [Resut parameter]
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