滴定靛蓝和保险粉

Julabo：VISCOAnalysis And Testing Technology Application Application Use Indigo is a so-called vat dye， which means that it needs to be reduced to its water soluble leuco-formbefore dying. The reduced form is absorbed into the fibres， and when oxidized back to its blue form itstays within the fibre. Earlier the reduction and dyeing was done with fermentation. Nowadays， themost of the reduction has been done chemically by sodium dithionite. Concentrations of indigo and dithionite (hydrosulfite) are titrated simultaneously automatic titrationusing potassium ferricyanide as titrant Appliances Titrator： 7000 M1/20 consists of Basic device Magnetic stirrer TM 235 20 mL exchange unit WA 20， with brown glass bottle for titrant complete Accessories： Titration head Z 306 Glass beaker 100 ml without sprout， tall form Nitrogen gas for purging Electrodes Electrode： SA Pt 7780 or Pt 62 Cable：L1 A Application Reagents Titrant： Potassium ferricyanide 0.05 mol/l NaOH 0.1 mol/l Dispersing agent solution such as Sera Sperse Setamol WS 5 % Description Potassium ferricyanide 0.05 mol/l solution 4.11 g Ks[Fe(CN)e] are weighed in a 250 ml volumetric flask and filled up with distilled water to the.mark. The solutions have to be stored in a dark bottle. The solution can be used for 1 week. Sample titration In the 100 mL glass beaker (tall form) are added 50 ml of the NaOH 0.1 m solution+ 1 ml of a5 %dispersing agent solution. The titration head is placed on the beaker and the solution is then purgedwith nitrogen for 5 minutes. To this solution are then pipetted 5 or 10 ml of the Indigo sample solutionLoad the suitable method and start the titration. Important： The solution must be yellow. If the solution is brown or even blue then the purging with nitrogen wasnot enough. Maybe the addition of some Hydrosulfite turns the colour of the sample solution intoyellow. This example was made with 5 ml sample volume： Standard documentation Titration graph 2.28ml1.87-677.8mV mddmV/dml Method name： Hydro-Indigo 5 ml a Titration duration： 6 m 12 s End date： 25.01.12 End time： 15：52：52 Titration data Sample ID： Test 3 Start mV -733.2 mV End mV 165.4 mV EQ1： 2.280 ml/-677.8 mV Hydrosulfit： 2.234 g/1 EQ2： 5.092 ml/-194.5 mV Indigo： 3.824 g/l Calculation formula Hydrosulfit： (EQ1*F1)-F2 Mol (M)： 1.00000 Indigo： (EQ2-EQ1)*F3 Mol (M)： 1.00000 Factor 1(F1)： 0.9800 Factor 2 (F2)： 0.0000 Factor 3 (F3)： 1.3600 Application Method Method data Method name： Hydro-Indigo 5 ml Created at： Method type： Automatic titration Last modification： Measured value： mV Damping settings： None Titration mode： Linear Documentation： GLP Linear steps： 0.100 ml Measuring speed / drift： Normal： minimum holding time： ：：02 s maximum holding time： 15s Measuring time： 02 s Drift： 20 mV/min Initial waiting time： 0s Titration direction： Increase Pretitration： off End value： 300.0mV EQ： On (1) Slope value： User-defined Value： 1350 Dosing parameter Dosing speed： 100.00% Filling speed： 30 s Maximum dosing volume： 20.00 ml Calculation formula Hydrosulfit： (EQ1*F1)-F2 Unit： g/l Decimal places： 3 Indigo： (EQ2-EQ1)*F3 Unit： g/l Decimal places： 3 Factor 1(F1)： 0.9800 Factor 2 (F2)： 0.1000 Factor 3 (F3)： 1.3600 Statistics： Off Application Notes lf 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，ChinaTel.：4008092068昌Fax： +86 (0)1064390585E-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： date： age of