检测过氧化值

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Julabo. (VISCOAnalysis And Testing TechnologyApplication Determination of Peroxidevalue Application Use The peroxide number gives the initial evidence of rancidity in unsaturated fats and oils. Other methods areavailable but peroxide value is the most widely used. It gives a measure of the extent to which an oil samplehas undergone primary oxidation. Appliances Titrator： TL 6000/7000 (TL 6000/7000 M1/10) consists of Basic device Magnetic stirrer TM 235 10 mL exchange unit WA 10， with brown glass bottle for titrant complete Electrodes Electrode： Pt 62 or Pt 61， or Pt 62 RG with cable L 1 A Reagents Titration agent： Sodium thiosulphate solution (NaSz0s) 0.01 or 0.001 mol/L Solvent： Acetic acid/chloroform or acetic acid/decanol (3/2) Other reagents： Potassium iodine solution sat. Description Preparation of Sodium thiosulfate solution 0.01 or 0.001 mol/L The 0.01 or 0.001 mol/L titrant are prepared freshly from a 0.1 mol/L titrant solution. The solution should bestored in a dark place. Preparation of the solvent mixture For 1 L solvent mixture add 600 mL acetic acid to 400 mL chloroform or decanol (hexanole is also suitable) Preparation of the potassium iodine solution The solution should be freshly prepared before using. Mix 1.0 g potassium iodine and 1.3 g distilled water. Titration Weigh 1 g or more of the sample (exactly on 0，0001 g) in an Erlenmeyer volumetric flask. Add 30 mL of thesolvent mixture to dissolve the sample. Add 0，5 mL of the potassium iodine solution， close the Erlenmeyerflask with a stopper and stir well for 60 sec. Add 30 mL of distilled water， place the electrode and titration tipin the sample and start the method (stir very well). Carry out a blank titration without the sample in the samematter before. The result of PV is calculated in milliequivalents O2per kg sample. Electrode handling If not in use， the electrolyte should be stored in the electrolyte solution. For further details， please refer to theelectrode's operating instructions. Application Methods Blank value (page 1)： GLP documentation Titration graph 0.01 ml202.6 mV mV/ml midmV/dml Method data Calculation formula Blank： EQ1 -> M01 Statistics： Off Statistics： Off Application Blank value (page 2)： Method data overall view Method name：POV BlankCreated at：04/30/1316：06：44Method type：Automatic titrationLast modification：05/03/13 15：43：45Measured value：mVDamping settings：NoneTitration mode：LinearDocumentation：GLPLinear steps：0.004 ml Dosing parameter Dosing speed： 100.00% Filling speed： 30 s Maximum dosing volume： 0.20 ml Unit values Unit size： 10ml Unit ID： 10035516 Reagent： Na2S203 Batch ID： no entry Concentration [mol/]： 0.01000 Determined at： 04/09/13 19：04：39 Expire date： Opened/compounded： 一 Test according ISO 8655： Last modification： 04/09/13 12：04：42 Application sample titration (page 1)： GLP documentation Titration graph 0.2 0.4 0.6 0.8 1，0 1.2 1.4 1.6 1.8 l 1.62 m 208.7mv mV/ml dmV/dml Method data Method name： POV Titration duration： 1 m 59 s End date： 03.05.13 End time： 16：55：47 Titration data Sample ID： Olive oil Weight： 1.00940 g Start mV： 289.3 mV End mV： 173.2 mV EQ： 1.624 ml / 208.7 mV POV： 15.97 Calculation formula POV： (EQ1-B)*T*M*F1/(W*F2) Mol (M)： 1000.00000 Blank value (B)： 0.0120 ml (M01) Titre (T)： 0.01000000(a) Factor 1 (F1)： 1.0000 Weight(W)： 1.00940 g (m) Factor 2 (F2)： 1.0000 Statistics： Off Application sample titration (page 2)： Method data overall view Method name：POVCreated at：Method type：Automatic titrationLast modification： 05/03/13 15：14：08Measured value：mVDamping settings： NoneTitration mode：DynamicDocumentation： GLPDynamic：AverageMeasuring speed/ drift：User-defined：minimum holding time： 03 smaximum holding time： 15 sMeasuring time： 03 sDrift： 10 mV/minInitial waiting time：O sTitration direction：DecreasePretitration：offEnd value：OffEQ：On (1)Slope value：FlatValue： 120 04/30/13 16：11：15 Dosing parameter Dosing speed： 100.00 % Filling speed： 30 s Maximum dosing volume： 5.00 ml Unit values Unit size： 10ml Unit ID： 10035516 Reagent： Na2S203 Batch ID： no entry Concentration [mol/l]： 0.01000 Determined at： 04/09/13 19：04：39 Expire date： Opened/compounded： Test according ISO 8655： Last modification： 04/09/1312：04：42 Application Hints lf you have any questions concerning the application， you are welcome to contact us. Literature 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，ChinaTel.：4008092068 Fax： +86 (0)10 64390585E-Mail ： info@julabo.cn优莱博技术(北京)有限公司Web： www.julabo.cn， www.julabo-visco.com Page of Date： Page of Date：