Classification chart of chemically hazardous waste
Notes
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2.
3.
Start
4.
Solid or liquid?
Solid
Osmium, thallium, beryllium, and their compounds should be stored at each laboratory, etc.
because methods for treating them have not been developed. (Reagents containing thallium or
beryllium are collected in exceptional circumstances.)
PCB and PCB-containing substances should be stored strictly by each faculty/graduate school
as their treatment is prohibited.
Consult the ESC Q&A before discharging substances that may produce peroxide such as diethyl ether,
dioxane and tetrahydrofuran or explosive substance as their discharge is not allowed in principle.
Write down all the ingredients including coexisting substances clearly on the manifest slip for
requesting disposal of laboratory waste, ensuring that the total of content concentrations is
100% including water. If you do not know the appropriate separation/collection category,
contact the ESC Q&A. (http://www.esc.u-tokyo.ac.jp/)
Need to be discharged at
collecting chance of regular
mercury waste such as
YES
Is mercury
fluorescents.
contained?
NO
Liquid
* Filter the solid portion and separate it as “L”.
* Separate metallic mercury as a solid.
* Contact ESC in advance for metals and
alloys liquidized at ambient temperature.
Is free cyanide contained?
NO
Is mercury contained?
Mercury solid waste
Sort them by small plastic bags
with a barcode sticker on which
Is free cyanide NO
compounds are listed. Discharge
contained?
them in 20-liter PE buckets with lids.
YES
Hazardous solids
Put in PE bottles (narrow-mouth for
liquids and wide-mouth for solids)
and bring them directly to ESC.
YES *Keep pH at 10.5 or higher.
* Those containing only cyanide complex are
not classified as “B”.
Cyanide
YES
NO
Photographic
developer/stopper?
NO
YES
* Put fixer in the container specially designated by
the administration office of each faculty/graduate school.
Is fluorine or phosphorus
contained?
NO
YES
* Classify fluoride waste oil as “I”.
* CFCs and their derivatives are collected separately.
Is any organic
substance, cyanide
complex, ammonium ion
or other complexed
substance contained?
Mercury
Photographic
developer
Fluorine,
phosphorus
YES
Is water content 5% or more?
YES
* Flame-retardant substances are classified
to “K” even if water is absent.
NO
Is organochlorine
compound contained?
NO
* Classify chlorinated oil as
“I (waste oil)”.
NO
Machine oil (heavy oil)?
Non-combustible
YES
Organochlorine
YES
NO
* Classify silicone oil as “L” after letting them
soak to waste cloth, etc.
Waste oil
Combustible organic
Inorganic acid of 5% or more?
NO
Alkali of 5% or more?
NO
YES
* Classify hexavalent chromium compounds and their wash liquids as “D”.
Acid, dichromic acid
YES
* Classify those containing ammonia as “K”.
Alkali
Heavy metal
Published in June 2015, by Environmental Science Center, The University of Tokyo
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