电位滴定法测溴值_AT-510自动电位滴定仪测定环己烯的不饱和度(溴值)含量.pdf

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TIZ-12077Kyoto Electronics Manufacturing Co.，Ltd. KEM Application NotePolarization Titration Data No. NX19-12059 Unsaturation of Cyclohexene (titration for bromine number) Summary- As the result of studying the repeatability on the polarization titration by AT-510， a good resultwith 0.9mg/100g of maximum SD was obtained. -Measuring instrument- Main unit ： Potentiometric automatic titrator AT-510 Detector： Polarization preamplifier POT-510 Twin platinum electrode M-511 Thermostat water circulator -Reagent- Titrant：0.25mol/L-Potassium bromide/Potassium bromate Addition： Mixed solvent (acetic acid ： 1，1，1-trichloroethane ： methanol ：(1+5)sulfuric acid=714：134：134：18) -Method- Measurement ① Set the applied current at 10pA ② Put 2mL of the sample in 200mL beaker. ③ Add 100mL of the mixed solvent to it. ④ Cool down the above solution to the temperature between 0 and 5°C. ⑤ Titrate with 0.25mol/L potassium bromide/potassium bromate to determine theunsaturation of cyclohexene， i.e. the bromine number. (An end-point is detected from theinflection point on the titration curve.) -Equation- Bromine number(g/100g)： (EP1-BLK)×C1(0.03995)×K1(100)/Size EP1： Titer(mL) BLK： Blank volume(mL) C1： Concentration-conversion coefficient (0.25M-KBr/KBrO41mL=0.03995mgBr2 K1： Unit-conversion coefficient -Ambient conditions- -Ambient conditions- Temperature：22.4℃ Relative Humidity： 48% Weather：Cloudy -Reference- -Measurement parameter- Printout data- Data：2012/03/19 14：05 Method No. ： 03 Method Name ： Method03 Titr.Fom ： EP BuretNo. ：1 Preampo： POT DetectorNo.： 3 Unit： mV Max. Volume：20.000mL Titr.Wait ：30s Direction ： Auto [Dose1 Mode ：Volume Stop Buret No. ： 1 Volume： 9.0mL Cut Off Time： Os Dose Speed ： 1s/mL Dose Wait ： 0s ***Result *** Sample No. 02-01 Data：2012/03/19 14：17 Sample ID ： Method No. ：03 Method Name ：Method03 Titr.Fom： EP Sample Measurement Conc. 1 Calc.No.： 12 l.Level 772.4mV F.Level 13.6mV F. Volume 10.3500mL D.Volume 9.0000mL Titr.Time 00：07：42 Size 2.0731g Conc-1 18.939mg/100 EP-1 9.8281mL 372.8mV 一 12.EnL] [Control Data：2012/03/19 14：05MethodNo. ：03 Method Name：Method03 Titr.Fom ： EP End PointNo.： 1 Gain ： 1 End Sense ： Auto. Cut off Time：15s Unit Volume：0.05mLSpeed：：1s/mL Sampling mV： 4.0mV Sampling mL： 0.05mL Calculation] Data：2012/03/1914：05Method No.：03 Method Name： Method03 Sample Measurement Conc.1 End PointNo.： 1 Unit ：[mg/100]Coefficient1：.03995K1 ： 100 CO1=(E1-B1)*F1*C1*K1/SBlank1 ： 0.0mL Factor1： 1.000 -Measurement results- Run Samplesize (mL) Titer(mL) Conc.(g/100g) 12345 2.0731 9.82819.42509.83299.8615 9.7823 18.93918.16318.94919.004 18.851 Statistics MeanSDRSD 18.781g/100g0.3499g/100g1.8631% -Comments- Note that the determination of bromine number should be made at the applicable lowesttemperature because it is associated with the side reaction which is influenced by titrationtemperature. Http：//www. shxf17.com 上海旭风科学仪器有限公司 上海市闸北区荣路 el： Fax： 周峰 zhou-feng com