Paleonet: Splitting of small samples

Clement Poirier clement.poirier at univ-lr.fr
Thu Oct 11 15:42:18 UTC 2012


 

Dear Michael, 

you can make your own splitter following the (awful)
sketch below. The critical issue is to precisely align the funnel and
tube along the corner axis to get 2 identical half residues. Mine works
fine, the splitting is very rapid. However I've never quantified the
accuracy of the contraption, and I think this should be done before
going further. 

Hope this helps... 

Clement Poirier 

Le 11.10.2012
15:25, Michael Hesemann a écrit : 

> Dear Paleonetters,
> 
> how may I
split a foraminifera-rich sample-residue (>63µm) of about 20g 
> into
even portions of about 0,5g ?
> 
> So far I mix such a rich residue of
about 20g in a small container and 
> quickly dump it onto a sheet of
paper. Then I cut the residue carefully 
> with a knife into 4 parts and
so forth until I end up with about 0,5g. 
> The method doesn't seem very
reliable for evenness and puts the whole 
> picking and counting into
question. As I want to process many samples 
> rich in small forams
counting of 5g with 5000+ specimens is not an 
> option and I need to
count 300-500 specimens per sample.
> 
> Will a common micro-splitter do
such a delicate job ? So far I didn't 
> want to spend $400 on a
micro-splitter as I am an amateur :)
> 
> Thanks for your advice.
> 
>
Michael Hesemann
> Foraminifera.eu Project
> Hamburg, Germany
>
www.foraminifera.eu [1]
> 
>
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>
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Links:
------
[1] http://www.foraminifera.eu
[2]
http://mailman.nhm.ac.uk/mailman/listinfo/paleonet
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