CAC RCP 60-2005

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1、CAC/RCP60-2005Page1of10CODEOFPRACTICEFORTHEPREVENTIONANDREDUCTIONOFINORGANICTINCONTAMINATIONINCANNEDFOODSCAC/RCP60-2005INTRODUCTIONHISTORYOFUSEOFTIN1.Tinisasoft,white,lustrousmetalwithanatomicweightof118.7andthechemicalsymbolSnoafteritsLatinname,Stannum.Ithasarelativelylowme

2、ltingpoint(231.9C)andishighlyresistanttocorrosion,whichmakesitanidealelementfortheprotectivecoatingofmetals.Over50%oftheworld’stinproductionisusedforplatingsteelorothermetals.2.Todaysome15milliontonnesoftinplateareproducedeachyearusingrapidandhighlysophisticatedproductionmet

3、hods.Thesemethodsareabletocontrolsteelthicknessesandtincoatingmassestowithintheextremelyfinetolerancesrequiredformoderncanmakingprocessessuchashighspeedwelding.TINASPACKAGINGFORCANNEDFOOD3.Tinisusedtoprotectthesteelbasefromcorrosionbothexternally(aerobicconditions)andinterna

4、llywhenincontactwithfoods(anaerobic).Undertheanaerobicconditionsexpectedinsideaninternallyplainprocessedfoodcan,tinwillnormallybehaveasthesacrificialanode,dissolvingveryslowlywhilstprotectingthesteelbasefromcorrosionandcreatingareducingenvironmentinthecan.Itisthismechanismth

5、athasenabledtheplaintinplatecantomaintainitslonghistoryandproventrackrecordofprovidingwholesomefoodonayearroundbasisandsafestorageforlongperiodsoftime.4.Thelaterdevelopmentofcanlinings(lacquers)enableddifferenttypesoffoodproductstobesatisfactorilypacked.Forexample,somehighly

6、pigmentedfoods(beetroot,berryfruits)havetheircoloursbleachedbytindissolutionandarebestprotectedfromcontactwithtinbyuseoflinings.Asmallnumberoffoodproducts(e.g.sauerkraut)haveadifferentcorrosionmechanism,inwhichthetindoesnotbehavesacrificiallyanddirectcorrosionofthesteelbasec

7、anoccur.Theseproductsshouldalsohavetheadditionalprotectionofaninternallacquersystem.5.Theusesoftinhavechangedconsiderablyovertheyears.Humanshave,however,beenexposedtotinforcenturies,throughthefoodtheyeat,withnoknownnegativelongtermeffects.Onlylimiteddataisavailableonthetoxic

8、ologicaleffectsofinorganictinaspresentincannedfoods,resultantfromdissolutio