90plus纳米粒度仪应用案例
文献名：influenceofnanotubepreparationinaquaticbioassays
作者：alanj.kennedy1,*,jonasc.gunter2,marka.chappell1,jenniferd.goss3,matthews.hull4,roberta.kirgan1andjefferya.steevens2
1u.s.armyengineerresearchanddevelopmentcenter,environmentallaboratory,3909hallsferryroad,vicksburg,mississippi39180
2lunainnovations,3157statestreet,blacksburg,virginia24060,usa
3specpro,3909hallsferryroad,vicksburg,mississippi39180,usa
4virginiapolytechnicinstituteandstateuniversity,departmentofcivilandenvironmentalengineering,418durhamhall,blacksburg,virginia24061,usa
摘要：knowledgegapsinnanomaterialfateandtoxicitycurrentlylimittheabilityofriskassessmentstocharacterizetheenvironmentalimplicationsofnanomaterials.thisproblemisfurthercomplicatedbythelackofstandardizedcharacterizationandpreparationmethodologiesforresearcherstogaintheneededinformationtoassistriskassessors.inthepresentstudy,dataweregeneratedtodetermineifmultiwallednanotube(mwnt)fateandtoxicityarealteredbyengineeredsurfacemodificationsorbydifferentdispersalmethods.whiledissolvedorganicmatterwasagooddispersingagentofmwntsinwater,thehumicacidfractionwasamoreeffectivedispersantthanthefulvicacidfraction.whenstabilizedinorganicmatter,thefunctionalgroupattachedtothemwntcontrolleditstoxicity.underivatizedmwntsinducedrelativelymoderatetoxicitytoceriodaphniadubiaafter96h(25±19%survivalat26mg/l),whilehydrophilicgroups(hydroxyl,carboxyl)reducedthistoxicity(93±12%survivalat48mg/l).however,otherfunctionalgroups(alkyl,amine)increasedtoxicity(0±0%survivalat<15mg/l).indispersalmethodstudies,sonicationofmwntsincreasedfragmentationrelativetomagneticstirring.thesonicationtreatmentofmwntsalsoslightlyreducedthemortalityofc.dubiainthewatercolumnbutincreasedtoxicityinthesedimenttoleptocheirusplumulosusandhyalellaazteca.findingsinthepresentstudyindicatethatnanotubesengineeredforspecificapplicationsneedtobemanagedindependentlyandthatlaboratorymethodstodisperseandtestnanotubesinbioassaysneedtobestandardizedtoobtainrepeatableresultsforcomparisonofmaterials.
关键词：nanotube;toxicity;ceriodaphnia;leptocheirus;hyalella