微塑料进入地表水的途径和风化特征.pdf

1、Pathways of entry and signatures of weathering for microplastics in surface watersNicole L.Fahrenfeld,Ph.D.Professor|Civil&Environmental EngineeringRutgers,The State University of New Jerseynfahrenfrutgers.eduConceptual model of MP fateBay:nets trawled 20-30min at 1-2 knots 16-65 m380-153 m mesh siz

2、eWastewater influent+effluent(4L)StormwaterZooplankton4Comparing surface water&pathways of entry500-2000 m250-500 m5Low flowLow flowHigh flowLow flowHigh flow500-2000 m250-500 m6(Plastics Europe,2016).too much overlapLinking polymer type to use?7Comparing polymer profiles from the estuary to pathway

3、s of entry8500-2000 mComparing pathways of entry to surface water MP9WWWWImpact of methods on polymer diversity and MP count-based concentrationsUrban wastewater&stormwater MP observationsSignatures of oxidative weathering10Wastewater sampling4 WWTP 3 datesInfluentPre-filtrationEffluent6.8L21L6.2L14

4、15Stormwater microplastic observationsStormwater microplastic polymer types250-2000 mExample urban stormwater MPs(63-250 m)17Stormwater polymer types18SamplesPolypropylenePolyethyleneABSUnknown63-250 mMoving beyond size bins for MP19 Losses due to heating?Losses of dense polymers?Limited adoption in

5、 the literature to dateEvolving extraction methods2021ASTM10-20L sampledWet peroxide oxidation Cellulose DigestionDensity separationSmallest sieve size=500 mCumulative rainfall(cm)ASTM10-20L sampledWet peroxide oxidation Cellulose DigestionDensity separationNOAA5L sampledWet peroxide oxidation Cellu

6、lose DigestionNaCl density separation221-4 polymer types per sample1-14 polymer types per sample23Estimating MP loadingEstimating MP loadingWatershed delineationRunoffCurve number(SCS-CN)ArcGIS Pro Digital Elevation Model(DEM)USGS Water Boundary DataFlow direction,flow accumulation Boundaries of the