[Ifeffit] Ifeffit Digest, Vol 212, Issue 7

Fri Oct 16 07:29:03 CDT 2020

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)

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Message: 1
Date: Fri, 16 Oct 2020 05:21:58 -0400
From: Dean Hesterberg <dean_hesterberg at ncsu.edu>
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] P K-edge XANES spectrum question
Message-ID:
	<CANEgao_RuxGJ7khkrwypyqu4FM333aw3iozgtPJHuZP6Sx9KSA at mail.gmail.com>
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 <ganga at ksu.edu> 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
>
>
> _______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit
>

--
DEAN HESTERBERG
William Neal Reynolds Distinguished Professor of Soil Chemistry Dept. of Crop and Soil Sciences NC State University

email: dean_hesterberg at ncsu.edu
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Message: 2
Date: Fri, 16 Oct 2020 22:52:52 +1300
From: Mike Massey <mmassey at gmail.com>
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] P K-edge XANES spectrum question
Message-ID: <3697CB1C-9CA1-46AE-A6A7-828A886BDD3F at gmail.com>
Content-Type: text/plain; charset="utf-8"

I recommend diluting this sample by a lot (20x maybe, or more) and collecting another spectrum. I've had instances of strange features in P spectra that ended up being weird self-absorption type artifacts.

I will dig through the spectra I have from similar samples, this one reminds me of a spectrum I saw once, perhaps in a similar system...It would be interesting if we inadvertently got similar results. Thanks for sharing!

Mike

> On Oct 16, 2020, at 10:22 PM, Dean Hesterberg <dean_hesterberg at ncsu.edu> wrote:
> 
> ?
> 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 <ganga at ksu.edu> 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-en
>> vironment-chem/ 
>> http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/in
>> dex.html
>> 
>>  
>> 
>> _______________________________________________
>> Ifeffit mailing list
>> Ifeffit at millenia.cars.aps.anl.gov
>> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
>> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit
> 
> 
> --
> DEAN HESTERBERG
> William Neal Reynolds Distinguished Professor of Soil Chemistry Dept. 
> of Crop and Soil Sciences NC State University
> 
> email: dean_hesterberg at ncsu.edu
> _______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit
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