No.TIQ-12320Kyoto ElectronicsNo.NZ22-12296 No.TIQ-12320上海市中山西路 2366弄1号203室网址: http://www.kem-china.com京都电子工业株式会社-可睦电子(上海)商贸有限公司电话:021-54488867 电邮: kemu-kem@163.com KEM ApplicationNote 0xidation-Reduction titration Concentration ocfhromium(VI) oxide(chromic anhydride)) inplating solution -Abstract- Titrated chromium (V) oxide with 0.1mol/L-sodium thiosulfateto determineconcentration from titration volume.The maximum inflection point was determined tobe the endpoint. -Equipment- Main unit : Automatic potentiometric titrator AT-510 Detector: Standard preamplifier STD-510 Combination Pt electrode +#429-0012 C-272 -Reagent- Titration solution : 0.1mol/L-sodium thiosulfate solutionAdditive : Ammonium fluoride 3mol/L-sulfuric acid Potassium iodide -Method- (1)Added 20g chromic anhydride to pure water to make it total 100mL. (2)Added 5mL of (1) diluted solution to pure water to make it 50mL. (1)Added 20g chromic anhydride to pure water to make it total 100mL. (2)Added 5mL of (1) diluted solution to pure water to make it 50mL.(3) Added 5mL of (2) to 200mL beaker, and added 1.0g ammonium fluoride to dissolve.(4) Then, added 10mL 3mol/L-sulfuric acid, and added 2.0g potassium iodide.(5) Added pure water to make it total 100mL. (6) Titrated with 0.1mol/L-sodium thiosulfate to obtain concentration. (5) Added pure water to make it total 100mL. (6) Titrated with 0.1mol/L-sodium thiosulfate to obtain concentration. -Calculation- Concentration (g/L) : (EP1-BL1)xTFxC1xK1/(SIZExR) EP1: volume (mL) BL1: blank (mL)=0 TF: factor=1.0 SIZE: sample size (mL) K1: unit conversion=1 R: dilution ratio=0.1C1: concentration conversion coefficient (0.1M-Na2S2O3·5H20 1mL=3.333g-CrO3) -Ambient condition一 Room temperature : 22.5℃ Humidity: 47% Weather: cloudy 一-Reference- -Titration parameteer- -Titration curve- Date:2012/06/23 09:19Sample ID : CrO3 Method No.: 10
Method Name: Chromium OxideDose Reagent Name: 0.1M/L-Na2S293 Titr Reagent Name:0.1M/L-Na2S203. Method Type : Titration Form : EP STOP APB No. :1 Unit No. :1 Detector No. :1 Unit :mVMax Volume :60.0 mL Wait Time : 20 s Direction : Auto Titr. Form :EP STOP End Point No.:1 End Sense : Auto End Point Area : Off Separation : Off Over Titr.Vol. : 0.0 mLGain :1 Data Samp.Pot. : 44.0 mVData Samp.Vol.: C0.5 mL Control Speed : Medium *** Result *** Sample No..:25-01 Date :2012/06/2316:18Sample ID : CrO3 Method No.).:10 Method Name: Chromium Oxide Titr. Time : 00:07:24 Size : 5mL Conc-1 243.71g/L End Point-1 Volume : 36.5607mLPotential : 233.4mV150 [mV] 4000.000 64.000[mL] Calc. Type : Sample Conc.1 : Set CO1=(EP1-BL1)*TF*C1*K1/(SIZE*R) Unit : g/L EP No. :1 Conc.2 : Off Conc.3 : Off Conc.4 : Off Conc.5 : Off Temp. Comp : Off C1(mg/mL) :3.333 K1 0.1 R : 0.05 Factor : 1.005 Conc. : 0.1 Factor :1.005 Conc. : 0.1 Blank 1 : 0.0 Run Size (mL) Vol.(mL) Conc.(g/L) 1st2nd3rd 55 5 36.560736.621436.5352 243.71244.12243.54 Statistics Mean 243.79g/L SD 0.2982g/L RSD 0.1223%