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检测脂肪和油类酸值和游离脂肪酸

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Determination of the exact concentration of the KOH titrant We recommend ready to use KOH titrants. The exact concentration of the KOH 0.1 mol/l can be determined using the titrimetric standard potassium hydrogen phthalate. In a 150 mL beaker, 0.2 g of the standard are weighed accurately and dissolved in 80 mL of dist. water with stirring. It is titrated with the 0.1 mol/l KOH solution. Repeat the standardization two times. The average value is stored automatically in the exchangeable unit.

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1Julabo:VVISCoAnalysis And Testing Technology Application Application Use The method is suitable for edible fats and oils such as butter, olive, palm or sunflower oil. The acidnumber is the quantity of base, expressed in milligrams of potassium hydroxide, thatis required to neutralize all acidic constituents present in 1 g of sample. The calculation of the % FFAdepends on the titrated type of sample. Appliances Titrator: TL 7000/TL 7750 M1 Basic device Magnetic stirrer TM 235 10 mL Exchange unit WA 10, with amber glass bottle for the titrant, complete Electrodes Electrode: N 6480 eth Electrolyte: L 5034 (LiCl/ethanol) Calibration: n.a. Application Reagents Titrant: KOH 0.1 mol/l in IPA (2-propanol). Also KOH 0.1 mol/l in ethanol Titer determination: Potassium hydrogen phthalate Solvent: Ethanol/diethyl ether (1:1) Description Determination of the exact concentration of the KOH titrant We recommend ready to use KOH titrants. The exact concentration of the KOH 0.1 mol/l can bedetermined using the titrimetric standard potassium hydrogen phthalate. In a 150 mL beaker, 0.2 g of the standard are weighed accurately and dissolved in 80 mL of dist.water with stirring. It is titrated with the 0.1 mol/l KOH solution. Repeat the standardization two times. The average value is stored automatically in the exchangeableunit. Pic. left: titer Page 1: Curve and result: Titer determination GLP documentation Itration oraph Method name: Titer KOH Titration duration: 3 m 25 s End date: 21.09.12 End time: 15:20:01 Ttation data Sample ID: KHPhthalat Weight: 0.1040 q Start mV: 165.1 mV End mV: -171.7 mV EQ: 4.933 ml/-91.2 mV Titer: 0.1032 mol/l Calculation formula Titer: (W*F2)/((EQ1-B)*M*F1)-> M103 Mol(M): 204.22000 Weight (W): man Factor 2 (F2): 1000.0000 1Blank value (B): 0.0000 ml Factor 1 (F1): 1.0000 Statistics: Off Application Page 2: Method parameters Titer determination: Method data overall view Method name: Titer KOH Created at: Method type: Automatic titration Last modification: 1 Measured value: mV Damping settings: None Titration mode: Dynamic Documentation: GLP Dynamic: Steep Measuring speed / drift: Normal: minimum holding time:02 s maximum holding time: 15 s Measuring time: 02 s Drift: Initial waiting time: 0s Titration direction: Decrease Pretitration: End value: EQ: On (1) Slope value: Steep Value: 700 Dosing parameter Dosing speed: 100% Filling speed: 30 s Maximum dosing volume: 50.00 ml Unit values Unit size: 10ml Unit ID: 00072696 Reagent: TBA Hydroxid Batch ID: 1.0265 Concentration [mol/l]: 0.10320 Determined at: 09/20/12 0:57:27 Expire date: 04/12/12 Opened/compounded: 10/19/11 Test according ISO 8655: 12/01/10 Last modification: 09/21/1215:13:56 Application Titration of the sample Weigh the sample in a 100 ml beaker and add at least 50 ml of the solvent mixture to the sample. Ifnecessary heat the solution to dissolve the sample. The sample weight should be calculated and selected that the titration amount is not more than 5 mlbecause of the long titration time. For acid numbers between 0.2 and 1 the sample amount should be about 10-20 g.For acid numbers between 1 and 10 the sample amount should be about 1-3 g. Place the beaker on the magnetic stirrer and start the titration method. After the titration rinse theelectrode and burette tip with solvent. For each set of samples perform a blank titration with 50 ml ofthe titration solvent. Result calculation The enclosed titration example shows the calculation of the result in mg KOH /g sample (acidnumber). The calculation of the % FFA value depends on the titrated sample. For many oil and fat samples themolecular weight of the oleic acid (282 g/mol) is used. % FFA=(EQ1-B)*282*T*100/(1000*W) EQ1: ml consumption at the equivalence point B: ml consumption for the blank titration 282: molecular weight of oleic acid in g/mol T: concentration of the KOH titrant (e.g.0.1 mol/l) 100: per 100 g sample 1000: 1 conversation W: sample weight in g Application Blank titration page 1: Curve and result GLP documentation 1Titration graph ·mV/ml dmV/dml Method data Calculation formula Blank: EQ1 ->M02 Statistics: OffStatistics: Off Application Blank titration page 2: method Method data overall view Method name: Blank AN Created at: 04/29/13 16:44:04 Method type: Automatic titration Last modification: 04/29/13 16:46:25 1 Measured value:mVDamping settings:strong Titration mode: Linear Documentation: GLP Linear steps: 0.010 ml Measuring speed / drift: 12 S Initial waiting time: 10 s Titration direction: Decrease Pretitration: Off End value: EQ: Dosing parameter Dosing speed: 100.00 % Filling speed: 30 s Maximum dosing volume: 0.30 ml Unit values Unit size: 10ml Unit ID: 00072696 Reagent: TBA Hydroxid Batch ID: 1.0265 Concentration [mol/l]: 0.10350 Determined at: 09/21/1222:27:50 Expire date: 04/12/12 Opened/compounded: 10/19/11 Test according ISO 8655: 12/01/10 Last modification: 09/21/1215:28:02 Application Sample titration page 1: Curve and result GLP documentation Titration graph mV Olive oil 150,0 Method name: Acid number Titration duration: 3 m 33 s End date: 30.04.13 End time: 12:19:19 Titration data Sample ID: Olive oil Weight: 10.03650 g Start mV: 123.5 mV End mV: -94.6 mV 0.55 ml -47.4mV EQ: 0.548 ml /-47.4 mV AN mgKOH/g: 0.260 0.6 Calculation formula AN mg KOH/g: (EQ1-B)*T*M*F1/(W*F2) Mol (M): 56.10000 Blank value (B): 10.0990 ml (M02) Titre (T): 0.10350000 (a) Factor 1 (F1): 1.0000 Weight(W): 10.03650 g (m) Factor 2 (F2): 1.0000 Statistics: Off Application Sample titration page 2: method Method data overall view Method name: Acid number Created at: Method type: Automatic titration Last modification: Measured value: mV Damping settings: strong Titration mode: Linear Documentation: GLP Linear steps: 0.050 ml Measuring speed / drift: User-defined: minimum holding time: 07 s maximum holding time: 20 s Measuring time: 04 s Drift: Initial waiting time: 10 s Titration direction: Decrease Pretitration: End value: EQ: On (1) Slope value: Flat Value: 120 Dosing parameter Dosing speed: 100.00% Filling speed: 30 s Maximum dosing volume: 6.00 ml Unit values Unit size: 10ml Unit ID: 00072696 Reagent: TBA Hydroxid Batch ID: 1.0265 Concentration [mol/l]: 0.10350 Determined at: 09/21/12 22:27:50 Expire date: 04/12/12 Opened/compounded: 10/19/11 Test according ISO 8655: 12/01/10 Last modification: 09/21/12 15:28:02 Application Notes If you have any questions on the application, you can feel free to contact us.. JULABO TECHNOLOGY(Beijing)Co.,LTD地址:北京市朝阳区酒仙桥东路1号院M8号楼C厅3层301室 Add : Room 301,C hall,M8 office building,No.1 jiuxianqiao east road ,Chaoyang District,Beijing,China mTel.:4008092068昌Fax:+86 (0)10 64390585 ③Web: www.julabo.cn, www.julabo-visco.com ( 优莱博技术(北京)有限公司 ) page from ate: date:age from

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