实验报告英文

determinationofheavymetalsinsoilbyatomicabsorptionspectrometry (AAS )name : xufei组： the 3rd组date: sep. 20th 2012部件1 the introduction1. 1the purposes(1) learnhowtooperatetheatomicabsorptionspectrometry；(2) learnhowtodothepretreatmentofsoilsamples；(3) getfamiliarwiththeapplicationofatomicabsorptionspectrometry。1. 2the principlesatomicabsorptionspectrometry (AAS ) isatechnicquerformatingquitionofchemicalelementspresentinenvironmentalsamplesbymatingtheabsorbedradiationbythechemicalelem entor yredingthespecicarrprdddddedwhenthesalsesexcedbyradiation.theatsatsebasebuthetorvertovilitylitheconnectrationiscalculatedbasedontheber-Lambert law.absorbanceisdirectlyproportionalttheconnectrationoftheanalystedabsorbbedff ons.theconnectrationisusullidementdfromcalibrationcurve obtaitindendusingstralleforknonconcentration.calibrationcurvemethod 33366 tionsoluterationst这些标准解决方案是mertheabsorbanceofthetestsolutionadjustedincos able ange，andddeterminetheconncentrationofthe元素从calibratingcurve第二部分材料和天体部分part 3处理器3.1 operating procedure for aas(2) installrequrerrequirtheportheporeandhollowcathodelamp.selecttheportselectproppritatiatelapcurrentandpreheatfor 30 min。(3) makessurcelectrectremetopointtozeroandtheturnonghigh-voltage power .(4) selectappropriateslitterwidth。(5) rotorommonchromatorandselectrequiredwavelength.ifthepowermetristoohighorlow，adjustongnolighvergenthemetrayesfullscale。(6) adjustlightpointandwavelength(8) injectdistilledwaterintotheflameandcontinuetopreheatthemer.injectdistilledwaterintotheflameaftereachsample .(9) select e，injectblanksolution是(10 ) optimitionanalysitionandmeasurestandardsolutionandsamples .(12 ) selectttforturningoffhighvoltagepower，decereateslampcurrentandtheturnoffthelamp.at the same time，altbutttontsoluttheshoring(13 )检查3.2 soil samples版本(1) preparationofextractingsolution (0. 05 mol/ldatasolution )18.6 goffedetadisdissssolveddwithwaterinabeaker (500 ml ).thephisadjustedto 7.0 usingdiuteammonia.themixtureistransferredintoavolumete(2) treatment of soil samples2.50 go fair-driedsolil (60-100 mesh ) isputtintoanerleneyerflaskwithstopper (100 ml ).12.5 mlofedtdta解决方案is added.themixtureisshaken(3) preparationofcustmentsolution0.10 gofcuisdissolveddin 15 mlof (1:1 ) nitricacidsolution.themixtureistransferredintoavolumetricflask (1000 ml ) anddiutedtothemarkwithre-distilled water.theconnectrationofthestockstandardsolutionis 100 g/ml.(theconnectrationshoubecalculatedaccordingtothemassofcu ).theworkingcustandardsolution (10g/ml ) isobtainedbydiuting 10 mlofcustare-distilled water(4) plotting of the standard curve0 ml、1 ml、2 ml、3 ml4mland5mlofcustandardsolution (10 g/ml ) areaddedresectivelyto6volumetric flask (10 ml ) with1mlo f5mol/lhydrochlorricacid.themixtureisdiutedwithre-distilledwaterandmixedwelltogive0g/ml、1.00g/ml、2.00g/ml、3.00g/ml、4.00 g/ml5. 00 g/ml ol . thestandardcurveisconstructedbyplottingabsorbancevs.concentration。(5) determination of samplesthesplansolutionsisanalyzedusingthesameprocedandstitionasforthestandardcurve第4部分结果4.1原始资料4.2 AAS标准曲线4.3计算管理器absorbanaceofsampleis0.0511。accordingtotheformulaabove : y=0. 0446 x0. 0024，r2=0.9997concentrationofcuinthesampleis :1.091 mg/l。第5部分discussionin this experiment， heexperimentationprocess standardsolutidepratedin perementrityandirentheeprementallingh ard curve，then，thesplansecontrationiscalculatedaccordingtotheabsorbanceofthesample。ultimately wegetthelinearformulaisy=0. 0446 x0. 0024 andr2=0. 9997.fromicardringtotheformulasandtheabsorbanaceofcuinthesampleis0. 0511 ationofcusinthesampleis 1.091 g/ml.werhaventheconncentrationofstessamplemeasureedbinstrumentis 1.091 mg/l .根据r2=0.0997的标准曲线和值 autheaccurateddataisduetotheefortsofweeveryone.thankseverymembersofourg