Hello Dean,
Thanks for this interpretation; it makes sense. I was (am still) quite
surprised by the intense of Al(III) pre-edge feature as we did not detect
anything else in our XRD work, except some Fe oxides (the product is X-ray
amorphous most likely).
Hello Mike,
Thanks. We diluted this sample already to bring P concentration below 5000
mg/kg. We can potentially try further diluting, but when we go below that,
sometimes we have a hard time getting a reasonable P spectrum in environmental
samples.
Best regards,
Ganga
Ganga M. Hettiarachchi, Ph.D.
Professor of Soil and Environmental Chemistry
Department of Agronomy
2107 Throckmorton Plant Sciences Center
1712 Claflin Road
Kansas State University
Manhattan, KS 66506 USA
785-532-7209 (office)
785-532-6094 (FAX)
http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environment-chem/
http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.html
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Today's Topics:
1. Re: P K-edge XANES spectrum question (Dean Hesterberg)
2. Re: P K-edge XANES spectrum question (Mike Massey)
--
Message: 1
Date: Fri, 16 Oct 2020 05:21:58 -0400
From: Dean Hesterberg
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] P K-edge XANES spectrum question
Message-ID:
Content-Type: text/plain; charset="utf-8"
Hello Ganga,
That is a very interesting spectrum. Given what you said about the system, the
lower energy feature at ~ 2146 eV should be Fe(III)-bonded phosphate and the
feature at ~2149 eV should be Al(III)-bonded phosphate. Both produce pre-white
line absorption peaks, but the Al-bonded phosphate peak is closer to the white
line and less distinct in spectra of Al-phosphates like variscite and
non-crystalline Al-phosphate, for example (see Khare et al. 2007. *Geochimica
et Cosmochimica Acta* 71:4405, Fig. 5C). A significant proportion of the
phosphate in your system apparently precipitated with Al-13 polymer structures
in the aluminum chlorohydrate.
Dean
On Fri, Oct 16, 2020 at 1:26 AM Ganga Hettiarachchi wrote:
> All,
>
> Can anyone provide some insight into the pre-edge ?features? in this P
> XANES spectrum?
>
> This is the P XANES spectrum we got for a recovered P-product (rich in
> Fe and Al) from wastewater using the AnMBR technology. During the
> coagulation process, our collaborators (environmental engineers) used
> stock solutions of aluminum chlorohydrate (ACH) and FeCl3.
>
>
>
> Thanks very much.
>
>
>
> Best regards,
>
>
>
> Ganga
>
>
>
>
>
>
>
> Ganga M. Hettiarachchi, Ph.D.
>
> Professor of Soil and Environmental Chemistry
>
> Department of Agronomy
>
> 2107 Throckmorton Plant Sciences Center
>
> 1712 Claflin Road
>
> Kansas State University
>
> Manhattan, KS 66506 USA
>
>
>
> 785-532-7209 (office)
>
> 785-532-6094 (FAX)
>
>
>
>
> http://www.agronomy.k-state.edu/research/soil-and-environment/soil-env
> ironment-chem/
>
>
> http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/ind
> ex.html
>
>
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--
DEAN HESTERBERG
William Neal Reynolds Distinguished Professor of Soil Chemistry Dept. of Crop
and Soil Sciences NC State University
email: dean_hesterb...@ncsu.edu
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Message: 2
Date: Fri, 16 Oct 2020 22:52:52 +1300
From: Mike Massey
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] P K-edge XANES spectrum question
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