Standard Operating Procedure for Chemical Handling and Storage
EHS-00005 R12
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DCN1216
CNSE Confidential
Page 14 of 43
8.9.2
The average density (in gallons/lbs. /cubic ft.) of hazardous chemicals
within a workstation within a fabrication area shall not exceed that listed in
Appendix D - Table II.
8.9.3
The average density (in gallons/lbs. /cubic ft.) of hazardous chemicals
within a single control area or laboratory shall not exceed that listed in
Table III. The design and number of control
areas in any given building
shall comply with the requirements set forth in New York State Fire Code
Table 2703.8.3.2 (see Appendix G).
9.
PERCHLORIC ACID
9.1
Perchloric acid (73% or greater) forms highly explosive and unstable
compounds with many combustible materials and with metals. Unstable
perchlorate compounds may collect in the duct work of improperly
installed fume hoods and cause fire or violent explosions.
9.2
Perchloric acid should be used with extreme caution and only in a fume
hood designed for its use - a perchloric acid hood has
corrosion-resistant
ductwork and wash-down facilities.
9.3
Containers of perchloric acid should be kept on trays of glass, ceramic, or
polyethylene materials of sufficient capacity to hold all of the acid in case
containers should leak. In general, acids
should be stored on trays
(polyethylene) with sufficient capacity to hold a leaking container's
contents.
9.4
Only minimum quantities should be kept, with no more than a one pound
bottle in the laboratory at any time. No flammables or organic solvents
should be used in a perchloric acid hood.
9.5
Perchloric acid should not be kept for more
than a year since explosive
crystals may form. To verify adherence to this rule the requestor must
place a date on the bottle of perchloric acid as soon as it is received.
9.6
Discolored perchloric acid should not be touched, it is most likely
contaminated and could be dangerous.
Contact the Department of
Environmental Health & Safety for proper disposal.
9.7
It is recommended that concentrations less than 73% follow the same
protocol outlined above with the exception of the wash-down facilities in
the designated perchloric acid hood.