Re: FW: Iron in drinking waters

[Franz Schoenhofer <schoenho@via.at>]

At 14:55 13.01.2000 -0600, you wrote:
>
>
>> -----Original Message-----
>> From:	Noyce, Jim 
>> Sent:	Wednesday, January 12, 2000 3:13 PM
>> To:	Caspary, Melanie
>> Cc:	Wu, Renpo
>> Subject:	Iron in drinking waters
>> 
>> Please post the following to the RadSafe newsgroup:
>> This question is related to the recent exchange of messages about possibly
>> extractable elements into water-immiscible liquid-scintillation cocktails;
>> elements (especially iron) that could interfere with the analysis of
>> Rn-222 in waters.  
>> What is a good source of information about the occurrence and
>> concentrations of dissolved metals in waters?  My particular interest is
>> Illinois ground waters. 

In my recent posting on this question I have shown (or at least I believe
so), that the occurrance of iron, and I extend that to other metals as
well, does not interfere with the determination of radon and radium in
drinking water, when using the extractive scintillation method. I pointed
out, that even when quench occurrs, the efficiency of alpha-emitters will
not be changed and therefore optimizing the window to include all alphas
will give a correct result. 

Concentration of metal ions in ground water vary to a great extent. They
should not be extracted by the scintillation cocktail I used, but I would
rather blame the quench to some unknown organic compounds, but I have no
analytical evidence for that. 

You are welcome to discuss this question with me privately.

Franz

 







 Thanks  
>> Jim Noyce, Illinois Department of Nuclear Safety, noyce@idns.state.il.us
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Franz Schoenhofer
Habicherg. 31/7
A-1160 Vienna
Austria
Tel.: +43-1-495 53 08
Fax.: same number
mobile phone: +43-664-338 0 333
e-mail: schoenho@via.at

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