Dear Otto,
do you deal with waterlogged samples? if not: we use a very simple
method for desintegrating clayey samples from mineral soils: we dry them
at low temperatures (30 degrees) for about 48 hours in a drying chamber
(correct term?). After adding then water, the sample desintegrates very
easily. We didnt see any damage of carbonised remains. But perhaps this
is obsolet, when you are dealing with waterlogged material. Then I would
propose to use the deep freezing (see Julian Wietholds email): with that
we made very good experiences.
All the best and good luck
Stefi
Otto Brinkkemper wrote:
>Dear colleagues,
>
>One of the solutions for wet sieving of clayey samples is the addition
>of hydrogen peroxide, which makes the clay desintegrate. I am
>considering using this for a set of Dutch samples, in which the
>preservation of the seeds is of great importance. Does anyone
>know references to studies that deal with the effects of hydrogen
>peroxide on botanical macroremains? If possible not only concerning
>the present or absence of particular species in a comparison of
>treated and untreated samples, but also on the corrosion observed
>in individual seeds? The effects could be both positive and negative,
>as H2O2 facilitates sieving, which might cause less harm to the
>seeds during sieving, but H2O2 may also influence the seeds by
>corroding them...
>
>Many thanks in advance for your reactions,
>
>oTTo
>
>
>
>
>
>
>De informatie verzonden met dit e-mail bericht is uitsluitend bestemd voor de geadresseerde. Openbaarmaking, vermenigvuldiging, verspreiding en/of verstrekking aan derden is niet toegestaan. Aan berichten via e-mail kunnen geen rechten ontleend worden.
>Gebruik van deze informatie door anderen dan de geadresseerde is verboden. U wordt verzocht bij onjuiste adressering de afzender direct te informeren door het bericht te retourneren.
>
>
>
>
>
>***** Rijksdienst voor het Oudheidkundig Bodemonderzoek *****
>
>
>
>
--
Prof. Dr. Stefanie Jacomet
Institute for Prehistory and Archaeological Science IPAS
Institut für Prähistorische und Naturwissenschaftliche Archäologie IPNA
Basel University / Universität Basel
Spalenring 145
CH-4055 Basel
[log in to unmask]
www.unibas.ch/arch
phone office: 0041 61 201 02 11
mobile: 0041 79 322 39 17
|