AT-510自动电位滴定仪测定水泥中氯离子的含量En

Mineral Ore NTIK-00112 KeM Application Note Chlorine Ion in Concrete Precipitation titration by Automatic Potentiometric Titrator Japan Concrete Institute Standard 1.Abstract Quantification of chlorine ion (Cl-) in hardened concrete is determined by potentiometrictitration using Chlorine ion electrode and Mercury sulfate reference electrode based onthe below quoted standard test methods. After 2mol/L nitric acid and 30% hydrogen peroxide solution are added to the sample，leave it to cool to room temperature， and add 0.005mol/L sodium chloride. Titrate with 0.005mol/L silver nitrate up to the endpoint， which is the maximuminflexion point on titration curve. The chlorine ion is calculated from titration volume of silver nitrate. 2.Reference 1)Japan Concrete Institute guidance JCI-SC5 Simplified Test Method for Total Salinity in Concrete2)Japan Concrete Institute proposition JCI-SC6 Test Method for Chloride Ion in Fresh Concrete by Chloride Ion Selective Electrode 3.Cautions in measurement Handle with care when work on chemicals.23 Use chlorine ion selective electrode， not silver electrode. Since addition method using sodium chloride is applied， the blank level obtainedby blank test must be deducted from titration. Http：//www. shxf17. com 4.Post-measurement care Polish sensor element of chlorine ion electrode with supplied polishing paper (forelectrode). 5.Test equipment Main unit：Automatic potentiometric titrator (Standard preamplifier STD-) Electrode：Option Chlorine ion electrode Option Mercury sulfate reference electrode 6.Reagent Titrant 0.005mol/L silver nitrate solution (f=1.006) Solvent Pure water， 2mol/L nitric acid， 30% hydrogen peroxide，0.005mol/L sodium chloride solution 7.Measurement procedure -Measurement- Deliver 2.0g sample to a 200mL beaker， and add 20mL pure water to stir. Add 20.0mL of 2mol/L nitric acid. Add 1.0mL of 30% hydrogen peroxide solution. Add 50mL pure water. Cover with watch glass， heat for 10 minutes， and leave it cool to roomtemperature. Add 5.0mL of 0.005mol/L sodium chloride.8 Titrate with 0.005mol/L silver nitrate. Likewise， perform blank test. 8.Formula Chlorine ion (ppm)=(EP1 - BL1)×TF×C1×K1/SIZE EP1 Titration volume (mL) BL1 Blank level (5.0978 mL) FA1 Factor of titrant (1.006) C1 Concentration conversion coefficient (0.1775mg/mL) (1mL of 0.005mo1/L AgNO：=0.1775mg Cl-) K1 Coefficient (1000) SIZE Sample size (g) Http：//www.shxf17. com 9.Example of measurement -Ambient condition- Room temperature ： 24℃ Humidity： 63% Weather ： Fair -Titration parameter- ·Titration curve - Model ： AT-510 Method No. ：10Titr.mode ： Intermit TitrTitr.form：EP Stop [Titration parameterl Form ： EP Stop APB No. ： 1Unit No. ：Detector No. ： 1Unit ：nmVMax.Volume ：20.0mLWait Time ：20sDirection ： Auto [Control parameter End PointNo. ： 1End sense ： AutoEnd Point Area ： OffSeparation ： (OffOver Titr.Vol. ：： 0mLCut-off Time ：10sUnit Volume ：0.15mLDispense Speed： 5s/mLGain ：5Data samp.Pot.：4.0mVData samp.Vol.：0.15mL Calc.Type ：Sample Conc.1 ： Set CO1= (EP1-BL1)*TF*C1*K1/SIZE Unit .ppmEP No. ：1 Temp.Comp.： Off C1(mg/mL) ：0.1775K1 ：1000 Factor ：1.006 Blank1 ： 5.0978 ***Result***Sample No. ：02-01 Date：2000/06/20 16：19 Method No.： 10 Bl ank 1 5.0978 Titr.Time ：00：25：20 Size ： 2.0167g Conc-1 605.46PPM End Point-1 Uolume 11.9358mLPotential ：-155.0mu250 [mj 55 0.000T.. 32.000 [mL] (The above printout data are obtained from titration by AT-510) 《Titration parameter》 Form： of titration/ APB No. the burette used in titration/ Unit No.： APB Unit File numberDetector No.： the detector used in titration/ Unit of potential/Max Volume： of titrationWait Time： before titration starts/ Direction.： of titration 《Control parameter> End Point No.： number of EPs / End sense： of EP detection / End Point Area： EP detection areaSeparation： of potential / Dispense Speed： of dosing /Over Titr.Vol. over-titrated volume / Cut-off Time：intermittent/ Unit Volume： single dose volume /Gain： sensitivity of detection signalData samp.Pot.： potential change of sampling signal/ Data samp.Vol.： titration volume of sampling signal 《Calculation parameter》 Calc.Type： of formula / Conc.1 formula 1 / Unit： of results /EP No. of calculation Temp.Comp.： temperature compensation / C1(mg/mL)： concentration conversion coefficient K1： unit conversion coefficient / Factor： factor of titration liquid / Blank1： blank level 1 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 -Measurement resultsS n Sample(g Titration(mL) Chlorine ion (ppm) 123 2.01672.0119 2.0089 11.935811.9718 11.9196 605.46610.10606.37 Chlorine ion after batch processed Mean 607.31 ppm SD 2.46 ppm RSD 0.40% *The above results were obtained by 3 tests of the same sample. *Red underline shows the data from page 3/4. 10.Summary Salinity saturation is enhanced by concentrated salt in frozen concrete duringwinter time， leading to corrosion of iron and steel products. To quantify assess ofsalinity by freezing， it is necessary to determine the relation of concentrated salinityto time dependency factor of freezing. Chlorine is proton number 17 element with chemical symbol Cl， which is a familymember of halogens. The test result shows a good repeatability with 0.4% relative standard deviation. Precise and reliable measurement is assured by the automated potentiometry. The analysis of chlorine ion in hardened concrete can be perfectly made by any of thefollowing titration systems manufactured by Kyoto Electronics (KEM). 【AT-610】 【AT-510】 【AT-500N-1】 AwardedProductt offSupremeTechnology from Kyoto City ·Compact and cost performancemodel · Low cost and high performance·Easy view with back light LCD ·Easy key entry by touch panel oflarge color LCD (8-inch wide) ·PC card expands data memory forconvenience and versatility. ● GLP/GMP conformed model · Simultaneous titration in parallel · Both potentiometricand KarlFischer moisture titration(coulometric"volumetric) can beperformed at a time. KEM KYOTO ELECTRONICS MANUFACTURINGCO.，LTD. Overseas Division： Yamawaki Bldg 9F，4-8-21 Kudan-minami，Chiyoda-ku， Tokyo 102-0074 JAPAN Phone： +81-3-3239-7333， Fax： +81-3-3237-0537 Head Office： 56-2 Ninodan-cho，Shinden，Kisshoin，Minami-ku， Kyoto601-8317 JAPAN Phone： +81-75-691-4122， Fax： +81-75-691-9961 URL： http：//www.kyoto-kem.com 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 20007 2 Http：//www.shxf17.com Tel： 021-66581985，63172460 Fax： 021-66581986 周峰 13916388882 zhou-feng1027@163.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-fengcom