Ta a lot Simon. That makes sense, you can see the flocs form, and mitigate immediately. I've got ovens and wafers, so I'll try the constant mass resuspension.
Our library does have a copy of Moore and Reynolds, but we are in the middle of a lockdown, and I can't get there! Thanks Matthew On Thu, 1 Jul 2021 at 15:30, Kemp, Simon J. <[email protected]> wrote: > Hi Matthew, > > > > Welcome to the wonderful world of clay mineralogy ! > > > > Separating the clay (typically <2 um) by gravity settling is actually > preferable to centrifuging, as you can more easily check for flocculation. > [If this is a problem add some drops of sodium hexametaphosphate (‘Calgon’) > solution.] At BGS, we dry our isolated <2 um fractions right down in a > moisture extraction oven (set at 55degC), homogenise and then resuspend a > known amount (¬80 mg) to produce a consistently thick oriented mount. > > > > If you are not aware of it – Moore & Reynolds (1997) is the bible for clay > preparation and analysis – very easy to follow. > > > > Moore, D.M. and Reynolds, R.C. 1997*. X-Ray Diffraction and the > Identification and Analysis of Clay Minerals, Second Edition.* Oxford > University Press, New York. > > > > Best regards, Simon > > > > *Simon Kemp* > > Senior Mineralogist > > > > *p *+44 (0)115 936 3448 > > *e *[email protected] > *w *www.bgs.ac.uk > > > > British Geological Survey | Nicker Hill | Keyworth | Nottingham NG12 5GG | > UK > > > > > > Profile <http://www.bgs.ac.uk/staff/profiles/0778.html> | *Twitter > <https://twitter.com/SimonKempBGS>* | Research Gate > <https://www.researchgate.net/profile/Simon_Kemp2> | Google Scholar > <https://scholar.google.co.uk/citations?user=UcipPfUAAAAJ&hl=en> > > > > > > *From:* [email protected] <[email protected]> *On Behalf > Of *Matthew Rowles > *Sent:* 01 July 2021 05:26 > *To:* RIETVELD_L Distribution List <[email protected]> > *Subject:* Clay sample preparation > > > > Hi all > > I’m gingerly venturing into clay analysis. > > I’ve done previous analyses on pre-separated clay fractions by > resuspending the clay in a little ethanol and dripping onto a Si wafter to > make an oriented mount (which is then also successively glycolated and heat > treated). > > I have some upcoming work which will necessitate creating the clay > fraction. > > I don’t have a centrifuge, so I have to separate the clay fraction by > settling. The USGS methodology looks like a good method to follow: > https://pubs.usgs.gov/of/2001/of01-041/htmldocs/methods/decant.htm > > > After I’ve suctioned off the clay suspension, what is the best way to get > at the clay? Leave it settle more? Evaporate the water? > > (I’m also in the middle of commissioning a spray-drier, so that will help > with the random mounts.) > > Thanks > > Matthew Rowles > This email and any attachments are intended solely for the use of the > named recipients. If you are not the intended recipient you must not use, > disclose, copy or distribute this email or any of its attachments and > should notify the sender immediately and delete this email from your > system. UK Research and Innovation (UKRI) has taken every reasonable > precaution to minimise risk of this email or any attachments containing > viruses or malware but the recipient should carry out its own virus and > malware checks before opening the attachments. UKRI does not accept any > liability for any losses or damages which the recipient may sustain due to > presence of any viruses. Opinions, conclusions or other information in this > message and attachments that are not related directly to UKRI business are > solely those of the author and do not represent the views of UKRI. >
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