flinnsci.com SAFETY REFERENCE CHEMICAL DISPOSAL PROCEDURES
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FLINN METHOD
#27j Halogenated Solvents
Halogenated solvents are toxic compounds. They are immiscible with water and
require licensed hazardous waste disposal (see Flinn Disposal Method #26c). Most
halogenated solvents are characteristic (toxic) or U-Listed hazardous wastes.
REFERENCES
The disposal procedures listed in this section are obtained from the following
reliable and highly regarded sources:
ACS Task Force in Laboratory Waste Management. Laboratory Waste Management:
A Guidebook. Washington, D.C.: American Chemical Society, 2012.
Armour, Margaret-Ann. Hazardous Laboratory Chemicals Disposal Guide, 3rd Edition.
Boca Raton, FL: CRC Press, Lewis Publishers, 2003.
“Little Known But Allowable Ways to Deal with Hazardous Waste.” EPA Publication
233-B-00-002. May 2000, accessed August 2015. http://nepis.epa.gov.
Lunn, George and Eric B. Sansone. Destruction of Hazardous Chemicals in the
Laboratory, 3rd Edition. New York: John Wiley and Sons, 2012.
National Research Council. Prudent Practices in the Laboratory: Handling and
Management of Chemical Hazards. Washington, D.C.: National Academies Press, 2011.
Flinn Method #27h, continued
2
Dissolve any leftover barium salt in a
minimum amount of water. (Barium
carbonate and barium peroxide are not
soluble in water, so just suspend them
in a tenfold excess of their weight in
water.)
Barium
Compound
H2O
3
Add 3 M sulfuric acid to the solution
while stirring until the precipitation of
barium sulfate appears to be com plete.
Add at least a two fold molar excess of
sulfuric acid.
3 M H2SO4
4
Allow the precipitate to settle, and
decant off the super natant liquid or
filter off the precipitate.
5
The liquid will be acidic. Using pH
indicator paper, neutralize it with
sodium carbonate. Check that the
neutral solution does not contain
residual barium, and rinse it down the
drain with excess water.
Na2CO3
pH Paper
6
Allow the precipitate to dry and
package it for licensed hazardous
waste disposal.
Hazardous
Waste
Please… Read the Narratives
Important narratives precede these specific chemical disposal methods!
Please read each narrative carefully! Do not use these procedures if you are
not comfortable with the chemistry. Do not use these procedures without
first consulting with your local government reg ulatory officials. These
procedures may not be used in some jurisdictions. All procedures involve
some hazards and risks. Once again… read the narratives that precede
these specific chemical disposal methods.
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