BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//www.hydro.uni-bayreuth.de//NONSGML kigkonsult.se iCalcreator 2.41.92//
CALSCALE:GREGORIAN
METHOD:PUBLISH
UID:38343033-6262-4662-b862-386334643363
X-WR-CALNAME:BayCMS-Export
X-WR-CALDESC:This is a calendar exported from BayCMS
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
TZUNTIL:20240331T010000Z
BEGIN:STANDARD
TZNAME:CET
DTSTART:20211031T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20221030T030000
RDATE:20231029T030000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:20220327T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RDATE:20230326T020000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:www.hydro.uni-bayreuth.de-bayceer-t164591id
DTSTAMP:20260913T113906Z
DESCRIPTION:Microplastic (MP) particles are ubiquitous in aquatic environme
 nts. Therefore\, understanding the processes that affect their removal fro
 m the water column\, such as sedimentation\, is critical for evaluating th
 e risk they pose to aquatic ecosystems. However\, our understanding of the
  mechanisms controlling aggregation and subsequent sedimentation of MP dur
 ing interactions with environmental particles is still limited. Here\, we 
 analyzed the heteroaggregation of 1 µm polystyrene (PS) particles and ferr
 ihydrite\, a common naturally occurring ferric (oxy)hydroxide. Furthermore
 \, we performed sedimentation experiments in which PS and PS + ferrihydrit
 e were analyzed in settling columns after 1 day and 1 week of settling tim
 e. The presence of ferrihydrite increased sedimentation rates of PS at all
  pH values studied (pH 3-11). At pH 6 we found that almost all PS particle
 s were removed from the water column after only one day of exposure time. 
 For the same samples\, SEM/EDS imaging and particle size measurements conf
 irmed strong heteroaggregation between PS and ferrihydrite. At acidic pH v
 alues\, zeta potential measurements indicated that the negatively charged 
 PS surface was coated with positively charged ferrihydrite particles leadi
 ng to charge reversal. Our results demonstrate for the first time that fer
 ric (oxy)hydroxides drive heteroaggregation and subsequent removal of MP f
 rom the water column\, especially at typical pH values found in natural la
 ke environments. Given their abundance in aquatic systems\, ferric (oxy)hy
 droxides need to be regarded as key scavengers of MP.
DTSTART;TZID=Europe/Berlin:20220502T090000
DTEND;TZID=Europe/Berlin:20220502T100000
LOCATION:H6
SUMMARY:Johanna Schmidtmann: Heteroaggregation of PS microplastic with ferr
 ihydrite leads to rapid removal of microplastic particles from the water c
 olumn
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR