糖果中水分检测方案

Kyoto Electronics Manufacturing Co.， Ltd.Data No.LA48-06208 No.EKVF-06232 KEMApplication Note No.EKVF-06232Volumetric Karl-Fischer Titration Moisture of candy -Summary- Checked the possibility of measuring moisture of candy in combination of MKA-520 withADP-344， and good repeatability was obtained. -Measuring instrument- Main unit： MKA-520 Volumetric KF moisture titrator Option： ADP-344 Evaporator Electrode： M-714 Twin platinum electrode -Reagent- Titrant： Composite 5 (f=4.8876 mgH20/mL) Dehydrating solvent： Dehydrating solvent FM -Measurement method- Preparation： (1) Fill the titration vessel with Dehydrating solvent. (2) Connect MKA-520 with ADP-344 and set the evaporation temperature at 50 C. (3) Pretitrate for dehydration. (4) Determine the factor of titrant. Measurement： (1) Collect the sample and measure for its moisture. -Equation- Moisture (%)： ((DataxF-Driftxt-Blank)/(Wt1-Wt2))x0.1 Data ： Volume at EP (mL) Blank ： Blank value (mg)F： Factor of titrant (mg/mL) Wt1 ： Tare including sample weight (g) Drift： Drift before measurement (ug/min) Wt2： Tare including residual weight (g) t：Measuring time(min) Standard method- Karl Fischer method -Ambient conditions- Temperature：25° ℃ R. Humidity： 61% Weather： Rain 上海旭风科学仪器有限公司 上海市闸北区万荣路388弄17号904室 200072 Http：//www.shxf17. com -Measurement parameter- -Printout data- 「Titration] Method 3 Titr Mode 3 Titr Buret No. 1 End Time 30 s Final Vol. 0.01 mL Titr Speed Slow Detector Mode 1 t(stir) 300 s t(wait) 10 s t(max) 0 s Drift Titr ： On Start ： Manual Max. Volume： 40mL Dose mode ： Off Oven ： Off [Calculation] Clac. No. 2 Unit ：% Weight ：\Variable Drift Comp.： Off 「DataList] Data Samp. Time 60s Data List ： Off Graphic Form Off Method Calc. No. 32 ***Result * * * Sample No. 21-01 Date 2006/08/05 13：08 Wt1 0.0559 gWt2 0.0 g Net 0.0559 g Blank 0.0 mg Result 3.4100% Bur. No.1 0.390 mL 1.9062 mg Titr. Time 00 ：07：10 ***Result***Sample No. 21-02 Date 2006/08/0513：25 Wt1 0.0569 g Wt2 0.0gNet 0.0569g Blank 0.0 mgResult 3.3500% Bur. No.1 0.390 mL 1.9062 mg Titr. Time 00：06： 52 ***Result*** Sample No. 21-03 Date 2006/08/05 13：35 Wt1 0.0661 gWt2 0.0gNet 0.0661 g Blank 0.0 mgResult 3.3274% Bur. No.1 0.450 mL 2.1994 mg Titr. Time 00：07：55 -Measurement results- Run Sample size(g) Titer(mL) Moisture(%) 123 0.0559 0.0569 0.0661 0.390 0.390 0.450 3.4100 3.3500 3.3274 Statistics Mean 3.3625% SD 0.0427% RSD 1.2695% -Comments- Set t(stir) [delay time] to dissolve the sample into the dehydrating solvent. Http：//www.shxf17. com Tel： Fax： 周峰 zhou-feng com