rates survey
roy hoffman (roy@cc.huji.ac.il)
Wed, 4 Feb 1998 12:21:13 +0200 (GMT+0200)
4-2-98
Dear all,
We are having some discussion in our lab. about 31P standards. The standard
is phosphoric acid. There are three questions: 1. Is it 85% or dilute? This
makes a 0.67 ppm difference. 2. Is it H3PO4 in H2O or D3PO4 in D2O? This makes
a 0.26 ppm difference. 3. If it is 85% how does one prepare the correct
concentration accurately? Each 1% difference causes nearly a 0.01 ppm shift.
Thank you for your help.
Yours,
Roy.
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V Dr. Roy Hoffman,
I Manager, NMR Laboratory, Department of Organic Chemistry,
A a X The Hebrew University of Jerusalem, Jerusalem, Israel 91904.
XJ lX Tel. (972) 2 6585327, Fax (972) 2 6585345, Email roy@shum.cc.huji.ac.il
X X Web page http://drx.ch.huji.ac.il:8080/hoffman.html
X
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