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INFORMATION SHEET: CS7 – SAFE DISPOSAL OF
HAZARDOUS (Special) CHEMICAL WASTE
This Information Sheet provides guidance on general considerations to make sure hazardous
chemicals are disposed of safely in order to protect both people and the environment. Further chemical
safety guidance can be found in other supporting Information Sheets.
General Information
Unless stored and disposed of properly, hazardous chemical waste poses risk to both humans and the
environment. Bangor University is committed to taking all necessary steps to prevent pollution of the
environment, to comply with all relevant legislation and minimise its environmental impacts.
Never assume you can just throw chemical waste in the general waste bin or down the
sink with lots of water to dilute it.
Many chemicals require specialist disposal. Although Health and Safety Services
arranges formal chemical waste collections with specialist Chemical Waste
Contractors, on a day to day basis, you, as a chemical user are responsible for the
arrangements to make sure all hazardous chemical waste associated with your experiment/activity is
dealt with safely and correctly. This includes ensuring:
1. Disposal is considered as part of the COSHH Assessment.
2. Understanding local arrangements ie waste bin colour coding, labelling, waste storage facilities.
3. Complying with all relevant legislative requirements. If unsure ask.
4. Storing chemical waste safely and correctly until such time it is removed from site via the formal
specialist Chemical Waste Collections.
Identifying Special Waste
The Hazardous Waste Regulations 2005 outline strict requirements with regards to the disposal of
certain hazardous wastes.
To decide if chemical wastes produced during experiments require specialist disposal you should refer
to the European Waste Catalogue. This Catalogue contains ‘absolute entries’ which define wastes that
are always considered to be special waste and ‘mirror entries’, wastes that are only classed as special
if the concentration of the dangerous substance is above a specific concentration. HOWEVER, this
Catalogue is an extremely complex document. The following summarises the general ‘do’s and don’ts’:
Do’s and Don’ts

Always try to segregate organic and inorganic chemicals.

Keep chlorinated organic liquids and non-chlorinated organic chemicals separate.

Keep strong acids and strong alkalis separate.

Keep flammable and oxidising chemicals separate.

Before re-using a container check what it originally held. Even if washed out, it may contain
residues that are incompatible with the new chemical leading to fire, explosion or toxic gas.

NEVER use Winchesters that held concentrated or fuming sulphuric acid for any other chemical.

Do use vented containers if you think there could be a risk of a build up of pressure.
www.bangor.ac.uk/hss (revised April 2015)
If the information provided with a chemical eg Material Safety Data Sheet, container label includes any
of the following symbols it should be dealt with as hazardous chemical waste. The ‘New CLP’ columns
relate to the Classification, Labelling and Packing Regulations (CLP) which come into full effect on 1st
June 2015. Hazard Symbols will change and Safety and Risk Phrases will be replaced with Hazard
and Precautionary Statements.
Old Definition
Old Symbol
New CLP
Symbol
New CLP Number / Definition
TOXIC / VERY TOXIC /
HARMFUL:
Substances that can cause
death or serious illness if even
a small amount enters the body
(by ingestion, inhalation, skin
contact)
GHS-06:
HARMFUL:
Substances that can cause
illness by ingestion, inhalation
or skin contact
GHS-07 (New):
IRRITANT:
Substances which can cause
inflammation of the skin,
mucous membrane or irritation
of the respiratory tract
NO PREVIOUS CATEGORY:
Closest match Irritant / Toxic
o Acute toxicity (Cat 1 - 3)
o Acute toxicity (Cat 4)
o Skin and eye irritation
o Skin sensitisation specific
target organ toxicity
o Respiratory tract irritation
o Narcotic effects
GHS-08 (New):
o Respiratory sensitisation
o Germ cell mutagenicity
o Carcinogenicity
o Reproductive toxicity specific
target organ toxicity
o Aspiration hazard
CORROSIVE:
Substances that can destroy
living tissue. Cause damage
quickly and can react violently
with water or certain metals eg
concentrated acids
GHS-05:
OXIDISING:
Substances that produce a lot
of oxygen and possibly heat in
contact with other substances,
particularly flammable
substances
GHS-03:
o Corrosive to metals
o Skin corrosion
o Severe eye damage
o Oxidising gases, liquids and
solids
Old Definition
Old Symbol
New CLP
Symbol
New CLP Number / Definition
EXPLOSIVE:
Substances that can explode
when exposed to heat, flame or
other sources of ignition. Very
sensitive to shock or friction.
Usually more dangerous when
dry
GHS-01:
HIGHLY / EXTREMELY
FLAMMABLE:
Substances that can ignite
spontaneously in air or react
with water or damp air to
produce dangerous quantities
of flammable gas. They can
also ignite in the presence of
sources of ignition including
static or heat
GHS-02:
o Explosives
o Self-reactive substances and
mixtures types A, B
o Organic peroxides, types A,B
o Flammable gases, aerosols,
liquids or solids
o Self-reactive substances and
mixtures
o Pyrophoric liquids and solids
Self-heating substances and
mixtures
o Substances and mixtures,
which in contact with water
emit flammable gases
o Organic peroxides
DANGEROUS FOR THE
ENVIRONMENT:
Chemicals that may present an
immediate or delayed danger to
one or more components of the
environment
GHS-09:
o Hazardous to the aquatic
environment
GHS-04 (New):
o Compressed gases, liquids
and solids
o Liquefied gases
o Refrigerated liquefied gases
o Dissolved gases
CRYOGENS:
Substances that boil at
extremely low temperatures
which are used to keep things
cold. Commonly used
cryogens include liquid
nitrogen. Contact with
cryogens can cause severe
damage to tissues. Also risk of
asphyxiation
The same
N/A
Similar
Hazards present in this Laboratory are RED:
Hazards present in this Laboratory are RED: