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Subject: Re: Oxalic Acid Evaporation
From: allen
Reply-To: Informed Discussion of Beekeeping Issues and Bee Biology
Date: Fri, 12 Mar 2010 08:48:33 -0700
> This will be a very useful URL:
>
http://www.agroscope.admin.ch/imkerei/00316/00329/02081/index.html?lang=en
> From the Swiss institute for bee research in Liebefeld.
Thanks for that. It seems to confirm that the risks are minimal.
Here is an excerpt from a URL on that page. The entire article
is worth reading.
Evaporation of oxalic acid - a safe method for the user?
T. Gumpp, K.Drysch, M. Radjaipour, P. C. Dartsch (2003)
Last modification: 02.02.2006 | Size: 330 kb | Type: PDF
http://tinyurl.com/yaxszga
...
Result: All measurements clearly underneath exposure-limit
Evaluation of data led to a clear result: None of the 20
participating
beekeepers reached even half the exposure-limit of 1.0 mg/rn3. (tab.
1). The
average value of the 10 measurements on evaporation procedure was
0.23
mg/rn3, the average value of the 10 measurements on spraying
procedure was
0.22 mg/rn3. There was no significant difference between both
methods (fig.
1).
To better comprehend these results we must briefly concern ourselves
with
the definition of the exposure- limit (MAK-Wert): The exposure-limit
is in
such a way selected that for an employee no health damage is to be
expected
if he stays 8 hours a day during a working life time at working
places at
which the alr concentration of the respective hazardous substance
doesn't
exceed the exposure-limit [4].
Thus, based upon the presented data, a commercial apiarist could use
oxalic
acid treatments during the whole year 40 hours a week without
damaging his
health.
Meaning of the results to apiarist's practice With evaporation- and
spraying-procedure of oxalic acid, beekeepers have possibilities of
treatment against varroatosis whose effectiveness and bee
compatibility have
already convincingly been proven [11]. However, there were concerns
that in
particular the evaporation procedure was injurious to user's health.
Overcautious scientists therefore warned about evaporating oxalic
acid or
recommended preventive measures which made the procedure
unpractical, e.g.
wearing ABC protection equipment. The presented study dispelled
reservations
against both procedures concerning possible health risks,
appropriate
application presupposed.
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