Chemical Managing Handling and Disposing.docx

Chemical Managing Handling and Disposing.docx

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ChemicalManagingHandlingandDisposing

MengIengGarmentFactoryLtd..

ChemicalManaging,HandlingandDisposing

1.Purpose

Thispolicyaimstoenforcechemicalmanaging,handlinganddisposingattheworkofthefactory,protectthefactory’spropertiesandemployees’safetytomakesurealltheworkcanconductfrequently.

2.Scope

Itisavailabletoalltheprocessingoffactory.

3.aintainingchemicalsafetyrequirescareinordering,storing,using,anddisposingofchemicals.Chemicalsafetyistheresponsibilityofeveryonewhousestheclassroomlaboratory,butsafemanagementofchemicalsbeginswiththeteacherwhoordersandusestheseproducts.

MAINTAININGCHEMICALSAFETYREQUIRES...

∙carefulselectionofallreagentchemicals.

∙accurateassessmentofrelativehazardsofchemicals.

∙properlabelingandstorageofallchemicals.

∙safeuseofallmaterials.

∙properdisposalofallmaterials.

Safemanagementofchemicalsintheclassroomrequiresthattheteacherhaveadequateknowledgeofthechemicalstobeusedandtheirinteractions.InformationaboutthesechemicalsisavailableontheMaterialsSafetyDataSheets（MSDSs）foreachchemical,inchemicalcatalogues,andoncontainerlabels.AnInternetsearchunderthekeyword"MSDS"willyieldinformationonwebsitesthatsupplyinformationonchemicals.

•See AppendixC,MSDS:

ExplanationandSamples.

Beforemakingarequesttouseareagentchemicalnotontheschoolsystem’sapprovedlist,theteachershouldreadandresearchtheappropriateMSDStodeterminewhetherthechemicalcanbesafelyusedwithstudents.Theteacheralsoshouldconsider--

∙therelativehazardlevelofthechemical.

∙theeducationalvalueofusingthechemical.

∙theteacher’sexperienceorlackofexperienceinusingthesubstance.

∙thedegreetowhichthelaboratoryisequippedforthesafeuseofthechemical.

•See ChapterIII.E,Ventilation.

A.ManagingReagentChemicals

1.SelectingReagentChemicals

Eachschoolsystemshoulddevelopalistofreagentsacceptableforuseinthevarioussciencecourses.Ateacherwhowishestouseasubstancenotontheappropriatelistmustseekthepermissionofthesciencesupervisorbysubmittingawrittenrequest.Therequestshouldincludethefollowing:

a.Acopyofthelessonplanfortheproposeddemonstrationorlaboratoryexercise.

b.Informationsupportingthefollowingassertions:

▪Useofthesubstanceispedagogicallysound.

▪Thedemonstrationorlaboratoryexerciseusingthesubstanceisaneffectivewaytoillustrateanimportantproperty,processorconcept. 

▪Nosatisfactorysubstituteforthesubstanceisreadilyavailable.

▪Adequatesafeguardsareinplacetoensureproperuseofthesubstance.

▪Studentswillbeinstructedintheproperhandlingofthesubstance（asindicatedinthelessonplan）.

c.Informationonthefollowingtoenablethesupervisortomakeaninformeddecision:

▪theextentofexposureofstudentsandtheteachertothechemical（includingestimateoftimetothenearestminute）.

▪theageormaturitylevelofthestudentswhowillbeexposed.

d.Inconsideringasubstanceforuseinthelaboratory,teachersareadvisedtocheckhazardousmaterialslistsavailableinprintandontheInternet.Resourcesavailableincludethefollowing:

▪TheNationalToxicologicalProgramforlistsofcarcinogenicandreproductivetoxins（teratogensandmutagens） 

▪TheNationalResearchCouncil’s PrudentPracticesintheLaboratory （1995）,Chapter3,forlistsofcarcinogens,mutagens,teratogens,andhighlyflammablematerials

▪TheOakRidgeToxicologyInformationResourcesCenter’s CatalogofTeratogenicAgents

Appearanceofasubstanceononeoftheselistsdoesnotprecludeitsappropriateuseintheschoollaboratory.Thedosemakesthedifference.Evencommonsubstancessuchaswaterandsaltcanbetoxicinexcessivequantities.Manysubstancesthataretoxicatsomelevelscansafelybeusedatlowerlevels.

MaterialsSafetyDataSheets（MSDSs）,whichprovideinformationontoxicitylevels,maybefoundontheInternet.

•See AppendixH,Resources.

∙OrderingReagentChemicals

e.Beforeorderingreagentchemicals,theteachershould- 

▪makesurethechemicalisontheschoolsystem’slistofapprovedchemicals.

▪becapableofassessingthehazardsofchemicals. 

▪besufficientlyknowledgeabletorecognizerequestsfromotherteachersfornonessentialchemicals.

▪haveacurrentinventoryofexistingchemicals.

•See ChapterVII.A.3,ChemicalInventory.

f.Reagentchemicalsshouldbeorderedinquantitiesconsistentwiththerateofuse.

g.Reagentchemicalsshouldbeorderedinpolyethylenebottlesorplastic-coatedbottles,ifavailable,tominimizebreakage,corrosion,andrust.

h.Foreachreagentchemicalused,askthefollowingquestions:

▪Canproperstoragebeprovidedforthechemical?

▪Arethefacilitiesappropriatefortheuseofthechemical?

▪Willthechemicaloritsendproductsrequiredisposalashazardouswaste?

▪Isappropriatepersonalprotectiveequipmentavailableforsafeuseofthechemicaloritsendproduct?

▪Havepersonswhowillhandleandusethechemicalbeentrainedinhandlingreagentchemicals?

Aretheyawareofthehazards?

∙ChemicalInventory

Inventoriesofreagentsareessentialinthecontrolofchemicalhazards.Theyenablemembersofthesciencedepartmenttodeterminetheexistenceofaspecificreagentchemical,itslocation,anditsapproximateshelfage.Areagentchemicalinventoryshouldbeconductedatleastonceayear.Thechemicalinventoryrecordshould-

∙containthedatetheinventorywasconducted.

∙identifychemicalreagentsbynameandformula. 

∙specifytheamountofeachreagentpresent.

∙indicatethestoragelocationofeachreagent.

∙indicatethehazardofeachreagent,usinginformationfromtheMaterialDataSafetySheet（MSDS）foreachsubstanceandtheappropriateNationalFireProtectionAssociationhazardcode.

•See AppendixE,NFPAIdentificationCodes,andAppendixC,MaterialsDataSafetySheets（MSDS）:

ExplanationandSamples.

Thefollowingwebsiteoffersmoreinformationonthistopic:

http:

//www.nfpa.org -NationalFireProtectionAssociation

∙indicatethearrivaldateandquantityofallreagentsreceived.

Thefollowingwebsiteoffersmoreinformationonthistopic:

http:

//www.osha.gov -OccupationalSafetyandHealthAdministration

∙ChemicalStorage

∙GeneralGuidelines

▪Securestorageareasagainstunauthorizedremovalofchemicalsbystudentsorothers.

▪Protecttheschoolenvironmentbyrestrictingemissionsfromstoredreagentchemicals.Ventsshouldbeductedtotheoutside.

▪Wherepossible,storageareasshouldhavetwoseparateexits.

▪Maintainclearaccesstoandfromthestorageareas.

▪Donotstorechemicalsinaislesorstairwells,ondesksorlaboratorybenches,onfloorsorinhallways,orinfumehoods.

▪UseNFPA-orOSHA-approvedstoragecabinetsforflammablechemicals.

▪Useanappropriate"AcidCabinet"foranyacidsolutionsof6Mconcentrationorhigher.Nitricacidneedstobeisolated. 

▪Userefrigeratorsofexplosion-prooforexplosion-safedesignonly.Donotusestandardrefrigeratorstostoreflammablechemicals.Place NOFOOD labelsonrefrigeratorsusedtostorechemicals. 

▪Labelstorageareaswithageneralhazardsymboltoidentifyhazardouschemicalsandindicatecorrectfirefightingprocedures.

•See AppendixE,NFPAHazardCodes.

▪FileaMaterialSafetyDataSheet（MSDS）foreverychemicalstoredinthelaboratory.

▪Storeallreagentchemicalsincompatiblefamilygroups.Donotalphabetize.

•See AppendixF,StorageofChemicals.

▪Storeallchemicalsateyelevelandbelow.Thepreferredshelvingmaterialiswoodtreatedwithpolyurethaneorasimilarimperviousmaterial.Allshelvingshouldhaveatwo-inchlip.Ifyouuseshelvingwithmetalbrackets,inspecttheclipsandbracketsannuallyforcorrosionandreplaceasneeded.

▪Storechemicalreagentspreparedinthelaboratoryinplasticbottles（ifpossibleandappropriatetothechemical）tominimizetheriskofbreakage.

▪Datecontainersuponreceiptandagainwhenopened.

▪Attachchemicallabelswithallnecessaryinformationtoallcontainers.

•See ChapterVII.A.5,LabelingofStoredReagentChemicals.

▪Whenopeningnewlyreceivedreagentchemicals,immediatelyreadthewarninglabelstobeawareofanyspecialstorageprecautionssuchasrefrigerationorinertatmospherestorage.

▪Testperoxide-formingsubstancesperiodicallyforperoxidelevels;disposeofthesesubstancesafterthreemonthsunlesstheMSDSforthesubstanceindicatesalongershelflife.

•See AppendixG,HazardsofPeroxide-FormingSubstances,andAppendixC,MaterialsDataSafetySheets（MSDS）:

ExplanationandSamples.

▪Checkchemicalcontainersperiodicallyforrust,corrosion,andleakage. 

▪Storebottlesofespeciallyhazardousandmoisture-absorbingchemicalsinchemical-safebags.

▪Maintainacompleteinventoryintheroomwherethechemicalsarestored,andmakeacopyavailabletofirefighters.

▪Keepstorageareascleanandorderlyatalltimes.

▪Havespillcleanupsupplies（absorbents,neutralizers）inanyroomwherechemicalsarestoredorused.

∙StorageofFlammableandCombustibleLiquids

▪Definitions

Flashpoint isdefinedastheminimumtemperatureofaliquidatwhichitgivesoffsufficientvaportoformanignitablemixturewithair.

Flammableliquid isdefinedasanyliquidthathasaflashpointbelow100F（37.8°C）.

Combustibleliquid isdefinedasanyliquidthathasaflashpointatorabove100F（37.8°C）.

▪Guidelines

▪Li