more HF in paleo (posted for H. Hilbrecht)

[N.MacLeod@xxxxxxxxx (N. MacLeod)]

Date: Thu, 25 Jan 1996 09:29:48 +0100
X-Sender: heinz@eurasia.ethz.ch
Mime-Version: 1.0
To: paleonet-owner@nhm.ac.uk
From: Hilbrecht@erdw.ethz.ch (Heinz Hilbrecht)
Subject: more HF in paleo

My recent comments on safety & HF was forwarded to an other listserver.
>From there I received a response by Claus Hedegaard that may be helpfull
for paleontologists handling HF.
I included a statement by William A. Shear in my message:
>>>spill kits which are available from any good science supplier.   Used acid
>>>can be neutralized with sodium bicarbonate.

The comment by Claus Hedegaard refers to this passage:
> Sodium or potassium hydroxide may be preferably - they do not effervesce
>when mixed with acid. After neutralisation the dissolved fluoride may be
>precipitated by adding calcium chloride, forming CaF2, though this does not
>necessarily get rid of Si/Al-fluoride complexes.
>comment from Claus Hedegaard (claus@ucmp1.Berkeley.EDU)

I hope this can help to reduce trouble with HF in our laboratories.

Heinz Hilbrecht






Address:

Heinz Hilbrecht
Geological Institute
ETH Zentrum
Sonneggstr. 5
CH-8092 Zuerich
Switzerland

phone:  ++41-1-6323676
fax:      ++41-1-6321080
Hilbrecht@erdw.ethz.ch