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SUMMARY:Settling of Solid Precipitates in Water - Bruce Sutherland (Univer
 sity of Alberta)
DTSTART:20230317T130000Z
DTEND:20230317T140000Z
UID:TALK196402@talks.cam.ac.uk
CONTACT:108503
DESCRIPTION:Over 2 billion years ago banded iron formations (BIF) develope
 d as a consequence of aqueous iron (FeII) precipitating due\, in part\, to
  the new presence of oxygen in the Archaen ocean. The outstanding question
  is how long did it take for the precipitates to rain out of the ocean col
 umn\, setting onto the ocean floor to form BIF? We examine an idealisation
  of this circumstance by performing laboratory experiments in which a solu
 tion of ferrous chloride (FeCl2) is combined with a solution of sodium hyd
 roxide (NaOH). If the limiting concentration of one of these two solutions
  is small\, tiny precipitates of “rust” (Fe(OH)3) form\, which slowly 
 settle. At larger concentrations\, however\, the precipitates accumulate i
 nto progressively larger flocs that initially settle rapidly\, but then fo
 rm convective flow patterns. Understanding these dynamics is a work in pro
 gress.\n \n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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