342.81 With respect to the use of perchloric acid in a laboratory fume hood, an employer shall ensure that
(a)
perchloric acid is used in a laboratory fume hood designed exclusively for its use,
(b)
signs are posted outside the laboratory fume hood indicating
(i)
that the fume hood is designed for perchloric acid use, and
(ii)
that the use or storage of combustibles in the laboratory fume hood is prohibited,
(c)
the exhaust ducts of a laboratory fume hood are as short as possible, routed directly outdoors with no interconnections to other exhaust ducts and equipped with washdown facilities,
(d)
containers of perchloric acid are stored in such a manner that, in the event of a leak, the spilled acid will not come in contact with flammable materials, wood or similar combustible materials,
(e)
the stored perchloric acid is inspected at least once a month and, if any discolouration is noted, the perchloric acid is disposed of immediately in a safe manner, and
(f)
anhydrous perchloric acid is used only if it is freshly made and any unused anhydrous perchloric acid is disposed of in a safe manner either at the end of the experiment or procedure or the end of the day, whichever occurs first.