简介：Thesolid-phasemicroextraction(SPME)combinedwithgaschromatography/massspectrometry(GC/MS)wasusedtodetermineandanalyzeorganicpollutantsincokingwastewater.Basedonthefactthatthemaincompoundsinthewastewaterwereorganics,somekeyparametersoftheSPMEwereoptimized.Themethodhasgoodlinearity(itscorrelationcoefficients>0.99)intherangedetermined,itsrelativestandarddeviations(RSD)arelessthan15%,anditsrecoveryisfrom87.9%to128.1%withthelowestquantificationlimitof5μg/L.Thismethodhasbeenusedtomeasure15organicpollutantsinwastewaterfromacertaincokingplant.Theresultsshowthatcomparedwiththeconventionalmethod,itcansaveanhourinpretreatmenttime.Itisafast,low-cost,accurate,simpleandefficientanalyticalmethodindeed.

简介：Inrecentyears,theconcernaboutenvironmentalprotectionisincreasingonaworldscale.MajormanufacturersofhomeappliancesandOAequipmenthaveintroducedso-called'greenprocurementschemes'forreducingenvironmentallyharmfulsubstancesinmanufacturingprocessandendproducts.Undersuchbackground,anewtypeofchromate-freeorganiccompositecoatedelectro-galvanizedsteelsheetwithhighconductivitywasdevelopedbyBaosteel,whichmeetstheEURoHSDirective(RestrictionoftheHazardousSubstances)andotherrelatedlawsandregulationsonenvironmentalsafety.Italsoprovidesexcellentsurfaceelectricalconductivity,corrosionresistance,fingerprintresistance,solventresistance,coatingadhesion,heatresistance,formabilityandotherspecialpropertiestomeetthedemandofmanufacture’sprocessofOAmachine.Comparedwithpreviouslydevelopedanti-fingerprintingcoatedelectro-galvanizedsteelsheet,thisnewlydevelopedproducthasagoodbalancebetweenhighcorrosionresistance(timeto5%whiterustinsaltspraytestis120hforflatpaneland72hforworkedpotion)andconductivity(surfaceelectro-resistivityinaccordancewithLOREASTislessthan0.1milliohm)duetothespecialdesignofcoating’sstructure.Besides,Italsoprovidesthepropertiesofgroundingandshieldingagainstelectromagneticwaves.Theevaluationofsurfaceperformancesofnewproductshowedthatitiscomparableorevenbetterthanthesimilarproducts.Currently,thenewlydevelopedproducthasbeencommercialized.Inthispaper,themajorpropertiesarediscussed,suchascorrosionresistance,surfaceelectricalconductivity,fingerprintresistance,solventresistance,coatingadhesion(ink/melaminealkydpaint),heatresistanceandformability.Furthermore,theapplicationisalsobrieflydescribed.