[alt-photo] Re: lead white as ground
alt.list at albertonovo.it
Mon Mar 26 20:52:19 GMT 2012
> Whenever lead is used in any way in which it can become airborne,
> the employer comes under the OSHA Lead Standard. The employer is
> required to monitor the exposure of any potentially exposed employee
> during their use of the lead compound. This includes teachers and
> even the janitor cleaning the area.
I would be cautious about the use of OSHA standards, because they refer to
an exposure of 8 hours a day for a working life (PEL: Permissible Exposure
Limit = 50 µg/m^3 averaged on 8 hours), or for limited times but still
weighted (TWA: Time Weighted Average for that day, Maximum permissible limit
in µg/m^3 = 400 divided by hours worked in the day).
I doubt that a conscious operator (that is, not spreading here and there,
and playing with lead carbonate in a room) would reach those values in less
than half an hour (TLW for 1 hour = 400 µg/m^3).
(all the text in a row!)
> Based on these air sampling tests in the breathing zones of the
> workers, the employer must create a written program detailing the
> precautions that will be used to insure that these exposures will be
> below the action limit for the standard of 0.03 mg/m3.
0.03 mg/m3 is below the threshold for 8 hours!
> ... I've seen scenarios like this
> I believe there is a separate occupational lead regulation in the
> Netherlands that has some of these features.
I would like to know more about this...
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