Chemical Waste for Disposal
Step 1. Evaluate Your Waste
Departments are required to evaluate their wastes, in compliance with
Minnesota Rules, to ensure proper waste disposal.
- To determine
if your unwanted chemicals (whether pure or in mixtures) are hazardous
check if they are listed in
Waste Registry. If the chemicals are
listed in the Registry and they do not have a nonhazardous designation
("xxNH" DDC number), then they must be managed as hazardous waste
following the directions in this Guidebook (see the warnings regarding
the disposal of nonhazardous chemicals in Part 1 and Part 2).
- If the compounds in question are not listed in
Registry, or you have chemical mixtures, follow the detailed
instructions in Step 6 - Complete the Hazardous Waste Packing Form as
per this guide
in doubt, Always manage the chemicals as hazardous waste, following the
directions in this guide, send them to the EHS Office 13 DADB for
- If you believe your waste is not hazardous, or
low concentration that it could be disposed of in the in the sewer or
regular trash. you must first obtain permission from the UMD EHS
office. Print and fill out the Permission
to Sewer or Trash Chemicals and send to 13 DADB for approval. Remember sewering or
trashing chemicals is not allowed without proper permissions.
For further assistance on proper waste evaluation,
call the UMD Office of environmental Health and Safety
Step 2. Collect the Waste in
waste Collection bottles and
lids must be compatible with the chemicals stored in them, both the
bottle and screw cap
must be chemically resistant to the waste chemical contained.
Collection bottles must be kept capped, properly labeled, and
stored in a safe location in the laboratory. Also, bottles
containing liquids should be stored with secondary containment, such as
a plastic tray or in proper safety cabinet. Drums if used should
not be stored with an
open bung or a funnel in them. All waste containers should be
appropriate locations, i.e. flammable liquid or acid storage cabinets.
containers larger than four liters in size are desirable for collecting
the waste in a laboratory, obtain prior approval from the UMD Office of
Environmental Health and Safety 726-7139.
Collect waste in a compatible and
properly labeled container
Fig 2: Keep
containers closed (except when
waste) and use
Package Chemical Waste for Collection in
Appropriate Containers as Follows:
Screw cap bottles:
Stoppered or corked flasks and bottles are
unacceptable. The contents
of these containers should be over packed into or transferred to a
cap bottle using a fume hood, proper protective equipment, and
secondary containment. Bottles
with broken or cracked screw caps are also unacceptable. Note that
there are exceptions to using screw cap bottles and some of these are
listed below. If there are problems in transferring the waste to the
suggested container for disposal, contact our office at 726-7139 for
Exceptions to screw cap bottles: Over packed
The following containers may be over packed into
a larger screw top
bottle or a plastic bucket with secure lid and surrounded with an
absorbent material such as vermiculite. The bucket must be labeled with
the contents and amount of chemical waste in the enclosed container.
- Flasks with frozen stoppers of unknown substance
- Bottles containing unwanted hydrofluoric acid
- Glass sealed ampules with low boiling point
- Microcentrifuge tubes with snap caps or similar
glassware or powdered chemicals which are not in a proper containers
should be packaged in sealed plastic bags, then over packed and labeled.
CAUTION: Wastes from different sources (i.e.,
reactions or processes) may react dangerously when mixed. Mixtures
should be stored separately.
Step 3. Label the Waste Container
Bottles of waste must be labeled as they are
generated in the laboratory or work area. Every bottle must be labeled
in one of two ways:
Yellow Hazardous Waste Label
Unused or outdated chemicals that are in their original containers with
labels identifying the contents are suitable for waste pickup by boxing
the containers and affixing the pink copy of the hazardous waste form
to the box. The completed waste form provides the words "Hazardous
Waste" and the date. If the original label appears faded or illegible,
affix a new label to the bottle.
Collection bottles used for process wastes or mixtures of spent waste
must use the yellow hazardous waste label supplied by the UMD EHS
Office. To obtain hazardous waste labels, call
Hazardous Waste Label
The following procedures should be carried out
to ensure proper labeling and safe handling of collection bottles:
the label to the bottle as soon as the bottle is started as a
collection container. Record this starting date on the label.
ingredients are added to the collection bottle, maintain a separate
ledger recording the ingredients and amounts added. All solvents,
including water in solutions and sludges, must be recorded. The ledger
must be kept next to the container
- Bottles in the process
of being filled must be kept capped and stored in a safe location;
storage location should be selected based on the characteristics of the
- When submitting the bottle for disposal, the
following information must be recorded on both the label and waste
- ingredients and their percentages;
- pH of aqueous solutions, or for organic
liquids, the pH of an aqueous solution containing 10% of the organic
- presence of any sludge or precipitate in
Most Common Chemical
Collection and Packaging
- Chemicals not labeled
- Incomplete information on labels and on waste
packing forms, e.g., contents descriptions, percentages, pH, and
- Chemical names and descriptions on waste
packing form do not match those on container labels
- Some containers are not listed on forms
- Hazardous liquid containers packed on their
- Bottles not tightly capped
- Incompatible chemicals packed together
These problems will
delay the prompt collection of your
4:Segregate the Chemicals
for Waste Storage and Transportation
compliance with federal and state regulations and safety considerations
of the University community, waste chemicals stored and/or submitted
for disposal or redistribution must be segregated and packaged by
chemical hazard class. These hazard classes are identified by the first
two digits of the Drum Designator Code (DDC) listed for the compound in
Chemical waste should be segregated and
packaged for disposal according to the following procedures:
must be packed in sturdy cardboard boxes, each box including materials
within one hazard class only. The hazard class is designated by the
first two digits of the DDC. These DDC numbers are based on Department
of Transportation (DOT) hazard classes and packages for shipment need
to comply with these requirements.
sulfuric acid, perchloric acid, nitric acid, water sensitive ("xxWS"),
shock sensitive ("xxSS"), cyanide ("xxCN") compounds, and mixtures are
exceptions and must be packaged in separate boxes.
- Chemical mixtures containing different hazard
class chemicals should be stored and packaged separately.
and commercial products not listed in the Chemical Waste Registry, and
unlabeled chemicals awaiting testing for their chemical
characteristics, should be packaged, or stored separately until
further guidance from the UMD EHSO at 218-726-6764 is obtained.
The following chemicals should always be packed
in separate boxes:
- Concentrated or fuming sulfuric acid
- Perchloric acid
- Nitric acid
- Cyanide compounds
- Water sensitive (WS) compounds (also segregate
- Shock sensitive (SS) compounds (also segregate
- Chemical mixtures containing different hazard
Some potentially explosive chemicals, identified as shock sensitive,
"xxSS" (DDC), and certain chemicals that react with water violently to
produce flammable or toxic gases, identified as water reactive, "xxWS"
(DDC), require special handling. For assistance, contact
our office at: 218-726-6764
that any waste containing mercury compounds should be kept in separate
collection bottles. Do not mix mercury waste with any other waste.
Step 5. Box the Chemicals for
chemical waste bottles have been properly labeled, package the waste
for transportation by carrying out the following procedures:
Fig 4: Package
containers upright in a
sturdy box with
Fig 5: Tape
a copy of the waste packing
form to the box
Perchloric acid, fuming nitric acid, and fuming sulfuric acid are
strong oxidizers and are exceptions to these procedures. If spilled,
they might react with newspaper or cardboard. They should be packaged
separately in a plastic bucket with a lid and surrounded by kitty
litter, floor dry, or sand.
- Bottles must be completely enclosed within
sturdy cardboard boxes.
- All bottles must be tightly capped and packed
in an upright position.
appropriate cushioning or absorbent material to separate the inner
containers; acceptable materials include vermiculite (preferred
choice), cardboard dividers, or crumpled newspaper. Bottles should not
be individually wrapped in paper. When the box is lifted, there should
be no "clinking" sound heard from contact between glass bottles.
- It is not necessary to box five gallon pails of
waste chemicals, but attach the waste packing form directly to the
the case of highly volatile chemicals requiring refrigeration, do not
package these chemicals for waste collection. Complete the waste
packing form according to normal procedures and note on the form:
- that the chemicals are refrigerated and
- the location of the refrigerator.
- Do not store the boxes in the hallway while
awaiting pickup. Store them
in a safe area in the laboratory or shop and separate them by DDC (e.g.
acidic, caustic, flammable, oxidizer). If stored closely together,
segregate the boxes by DDC numbers, using secondary containment trays.
Secondary containment trays are available from University Stores, (612)
624-4878, part numbers CX18998 (medium) or CX18999 (large).
generally have only four storage areas for their reagent (non-waste)
chemicals: flammable, acid, base, and other, but there are several
notable exceptions to this simplified segregation scheme (e.g. nitric
acid). Check compatibilities using this Chemical Registry DDC
or Material Safety Data Sheets (MSDS). Tubs and Trays can be used
separate chemicals within cabinets and on storage shelves.
Step 6. Complete the Hazardous
Waste Packing Form
Fill out the waste packing form
following directions in this
Fig 7: Mail
the top two copies to the Chemical
The Hazardous Waste Packing
Form is designed to meet regulatory
marking requirements for transporting hazardous waste. Failure to
properly complete the waste packing form may delay the collection of
the waste. The waste packing form requires the following:
information, chemical information describing the box's contents, and a
signature assuming liability (see Figure 8).
Fig 8: waste
out the following information: name, phone number, email address, date,
department number, building number, and room number. Building
numbers and department numbers can also be obtained from the Chemical Registry
Page. Use these numbers rather than names. If
your location is not listed, call our Office at 218-726-6764 for
The waste packing form is designed to have
information about one container or component of a mixture per line.
chemical information requested on the waste packing form must match the
container label description for each item and should be completed
adhering to the following instructions.
Chemicals listed in the Chemical Registry
The waste packing form should include the following information for
pure chemicals listed in the Chemical Registry:
Designator Code (DDC) and Chemical Abstract Service (CAS) numbers.
These numbers can be found in the Chemical Registry.
- Compound name
- EPA number(s) found in the Chemical Waste
- If unopened, check the recycle box (RECY?).
the amount of chemical in the container in kilograms (for solids) or
liters (for liquids). If the same substance is present in several
containers in the same box, put the chemical amount for each container
on its own line and use arrows drawn down to indicate that the rest of
the information is duplicated (see Figure 8).
The on line Registry is much more extensive than previous hard copy
versions, so it is recommended that you use it, especially if you
cannot find your chemicals listed in the older version.
Chemicals not listed in the Chemical Registry
Prepare for pickup as follows:
a small number of unlisted chemicals, less than 5 containers, either
package the items individually (single chemical type per box) or call
726-6764 for further instructions.
- Complete the chemical information on the waste
packing form as above, leaving the DDC and CAS sections blank.
- If any of the following information is known,
include this on the waste packing form:
- Product name
- Name and address of manufacturer or
- Product or catalog order number
- Approximate age
the pH of aqueous solutions, or for organic liquids, the pH of an
aqueous solution containing 10% of the organic mixture.
- If a Material Safety Data Sheet (MSDS) is
available, include a copy with the waste packing forms.
submitting a large number of unlisted chemicals for pickup, greater
than 4 containers, send a list of
the chemicals to our office at 13 DADB or Fax to: 726-6730
before packing. Pack these
chemicals only after you receive proper instructions from the UMD EHS
the mixture ingredients and their percentages on both the bottle label
and waste packing form. (Include water as an ingredient of aqueous
solutions.) Enclose the mixture ingredients in brackets on the waste
packing form (see Figure 10).
- Write the pH of aqueous solutions, or for
organic liquids, the pH of an aqueous solution containing 10% of the
organic mixture, on both the bottle label and waste packing form.
on the bottle label and waste packing form (underneath the compound
name) the presence of any sludge, precipitate, or material which is
- Package mixtures separately, in their own
containers and boxes.
Commercial (Trade Name) Products
- Include the following information on the waste
packing form (see Figure 11).
- Product name
- Ingredient list from the bottle label with
respective percentage composition
- Description of product's usage
- Manufacturer/distributor name, address,
city, and telephone number
- Product catalog number or batch code
- Approximate age
- pH (if liquid)
- If available, send a Material Safety Data Sheet
(MSDS) with the form.
- If none of the above information is accessible,
it may be necessary to treat the chemical as an unknown.
Unknown or Unlabeled Chemicals
- Unknown materials cannot be handled by the
Chemical Waste Program until some identification is made.
- To evaluate an unknown material, follow the
guidelines outlined in "Wastes Requiring Special Processing" Unknown
Chemicals. Contact our Office 726-6764 if
questions arise concerning preliminary analysis procedures.
is the responsibility of each generator (shop or laboratory personnel)
to follow the guidelines given in this Guidebook for evaluating,
packaging, and labeling chemical wastes. By signing the waste packing
form, the generator is stating that the procedures outlined in this
Guidebook have been followed and the waste is ready for pickup. Make
sure you sign your hazardous waste packing form before sending it in!
Step 7: Requesting Waste Collection
After taking inventory of the box and packaging
the waste, submit the Waste Packing Form as
the box and tape the pink bottom copy of the waste packing form to the
top of the box. Draw "Up" arrows on the sides of the box and mark the
top side "This End Up." Never store containers on their sides.
<>Attach a separate note or write on the waste
packing form below the compound name if special pickup arrangements are
necessary (i.e., where box is stored, what days the room is open,
etc.). Also note when our staff need to go elsewhere to get access to
the waste location.
Send the top two (white and yellow) pages of the waste packing form to:
Chemical Waste Program
Chemical Waste Program
1049 University Drive
Duluth, MN 55812
more than one waste packing form is needed to document the waste in a
box, annotate the "page __ of __" in the lower left hand corner of the
waste packing form. Tape a copy of the packing forms, or all the bottom
(pink) pages to the box. Staple
together all the top (white and yellow) pages for the box and mail to
the Chemical Waste Program at the address above.
Collection by the Chemical Waste Program
laboratories and shops can expect their waste to be picked up within
one to two weeks of sending in the waste packing forms. If you have
concerns about the timeliness of your waste collection, or your waste
has not been picked up within three weeks, call the EHSO at 726-7273,
or 726-6764 or e-mail at email@example.com,
the tracking number from the upper right-hand corner of the waste
packing form, along with the generator name and department
when requesting the status of your order.
Experiment Stations have collections scheduled at less frequent
Figure 9: Pure
Figure 9 describes nine separate containers of
pure chemical waste in one
box. Drum Designator Codes (DDC) and Chemical Abstracts Service (CAS)
numbers are listed in the Chemical Waste Registry, Appendix I. Note
that the first four containers hold chemicals which are potentially
recyclable. For chemical wastes that consist of mixtures of chemicals,
commercial products, or unknowns see fig 10 and 11.
Figure 10: Chemical Waste Mixture
Figure 10 describes two bottles, each filled with
the same chemical mixture.
For each component of the mixture, the Drum Designator Code (DDC),
Chemical Abstracts Service (CAS) number, compound name, and the
approximate percentage are listed. Note that the pH of the liquid
mixture is indicated on the waste packing form.
Figure 11: Waste
Pure, or Commercial -Chemicals
Figure 11 shows a single container of a commercial
product waste. The
product name, catalog number, manufacturer's name, address, and phone
number, the approximate age of the chemical, and the DDC and CAS
numbers are listed on the waste packing form.
If a Material Safety Data Sheet (MSDS) is available for a commercial
product waste, it should be attached directly to the waste packing form.