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Hi Wolfram, 

Sorry about the delay. Yes we have been using our existing keratins to do scale normalization. In the past we haven’t run reference waters at the same time as solid samples but I’ve actually been looking in to it for an unrelated project. Thanks for the suggestion. 

Best,
-Robin 

> On Sep 6, 2018, at 10:26 AM, Wolfram Meier-Augenstein (pals) <[log in to unmask]> wrote:
> 
> Hi Robin,
>  
>  
> Though I haven’t heard from you, I thought my suggestion might still prove helpful; if not for you then for colleagues facing similar problems.
>  
> Unless one wishes to go for maximum bang for one’s effort (exchange correction and scale normalization in one go), the situation you are facing can be solved without a keratin standard with a true, non-ex d2H value of about +60 ‰.
>  
> The keratin standards you are using are perfectly adequate to deal with correction for exchangeable hydrogen based on the comparative equilibration method using 100 % matrix matched standards.  Scale normalization of measured d2H values can be achieved in a separate step by including reference waters in silver tubes such as USGS48 and USGS49 as part of the batch run; these reference waters are available from the Reston lab.
>  
> https://isotopes.usgs.gov/lab/referencematerials.html <https://isotopes.usgs.gov/lab/referencematerials.html>
>  
>  
> Best,
>  
> Wolfram
>  
>  
> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Robin Trayler
> Sent: 05 September 2018 17:00
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] High δD keratin reference materials
>  
> Hi Everyone, 
>  
> Our lab has been measuring hydrogen isotopes on bird claws recently that fall well outside the range of our current reference materials. We currently use two keratin reference materials (CBS, δD = -197 and KHS, δD = -54.1‰) when running feathers and claws. Some of the claws we’ve analyzed have had δD values as high as + 50 to 60‰. Is anyone aware of any keratin reference materials that have δD around + 50 to +70‰?
>  
> Best,
>  
> Robin B. Trayler
> Stable Isotope Laboratory
> Department of Geosciences
> Boise State University, Boise, ID
>  
> 
>  
> 
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