DEPARTMENT OF CHEMISTRY
TEACHING LAB EXPERIMENT RISK ASSESSMENT FORM
This form must be completed jointly by the Lab Officer in charge and the Lecturer in charge. A
hardcopy of the completed form should be kept in a file together with the Project Risk
Assessment.
Name of Lecturer in Charge
Dr. Zhao Jin
Name of Lab Officer in
Charge
Module / Expt No.
CM1191 / Preparation
and Reactivity Study of
Tetraiodotin(IV)
Activity being assessed:
Preparation of SnI4 and its reactivity studies.
Known or expected hazards associated with the activity:
Hazards of reagents, solvents and known reaction products.
State each substance and the approximate amounts to be used/produced.
See Appendix 6.1
Incompatible materials (special precautions):
Tin: Strong oxidizing agents, Sulphur compounds, Strong bases, Halogens, Carbon tetrachloride,
chloride trifluoride.
Iodine: Rubber, Plastics, Iron and iron salts., Sulphur compounds, Ammonia, Magnesium, Zinc,
Aluminum, Metals, Alkalis, Antimony salts, Arsenites, bromides, chlorides, iodides,
thiocyanates, ferrous salts, hypophosphites, morphine salts, oils, creosote, phosphates, tannins,
tartrates, Mixing iodine, antimony, and ammonia resulted in an explosion. A violent reaction
occurs between iodine and acetaldehyde., Acetylene, Acetaldehyde.
Tin(VI) iodide: Strong bases.
Triphenylphosphine: Oxidizing agents
Dichloromethane: Alkali metals, Aluminum, Strong oxidizing agents, Bases, Amines,
Magnesium, Strong acids and strong bases, Vinyl compounds
Acetone: Bases, Oxidizing agents, Reducing agents, Acetone reacts violently with phosphorous
oxychloride.
Silver nitrate: Strong reducing agents, Alcohols, Ammonia, Magnesium, Strong bases.
Sodium iodide: Oxidizing agents, Strong acids, Bromine trifluorideOxidizing agents, Strong
acids, Bromine trifluoride
Toluene: Oxidizing agents
The risk of injury and its severity likely to arise from these hazards:
Iodine, phosphine, sodium iodide, silver nitrate, the organic solvents used and the tin compounds
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prepared in this experiment are all harmful. Toluene and acetone are flammable.
See Appendix 6.1
Who is at risk?
Person performing the experiment.
Measure to be taken to reduce the level of risk:
In general, Use PPE. Perform all operations in a well-ventilated fume cupboard. No eating and
drink is allowed in lab. Refer to MSDS for detailed safety information. Dispose of all organic
waste in the proper waste receptacle.
Training prerequisites:
General laboratory competence.
Use of Standard Electrical Equipment
Use of Glassware
Use and Disposal of "Sharps"
Use of Flammable, Explosive and Toxic Gases
Level of risk remaining:
Supervision required.
Emergency action if :
Spill:
(i)
(ii)
(iii)
(iv)
Eyes : Flush eyes with plenty of water for at least 15 minutes, occasionally lifting
the upper and lower eyelids. Get medical aid. Consult physician if necessary.
Show MSDS to the doctor in attendance.
Skin : Wash affected area with water for 10mins. Remove contaminated clothing.
Consult physician if necessary. Show MSDS to the doctor in attendance.
Inhalation : Remove to fresh air. If not breathing, give artificial respiration. Call a
physician. Show MSDS to the doctor in attendance.
Bench: Spillages on the work bench should be mopped up with a piece of cloth
immediately. Ventilate the area. Show MSDS to the doctor in attendance.
Fire: Suitable extinguishing media
Toluene: In case of fire: Use dry sand, dry chemical or alcohol-resistant foam for
extinction. Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Silver nitrate: In case of fire: Use dry sand, dry chemical or alcohol-resistant foam for
extinction. Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Tin(VI) iodide: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Iodine: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Tin: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Triphenylphosphine: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
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Dichloromethane: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Acetone: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Sodium iodide: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Is the experiment suitable for out-of-hours operation ?
Yes
No
References if any: Refer to the following MSDS for more information
MSDS of tin
MSDS of iodine
MSDS of tetraiodotin
MSDS of toluene
MSDS of triphenylphosphine
MSDS of sodium iodide
MSDS of acetone
MSDS of dichloromethane
MSDS of silver nitrate
Signature of Lab Officer in
Charge:………………………………………………………………..
Date:…………………………
Signature of Lecturer in Charge:………… ……………………………………..
Date:… ……………………..
Prepared Risks Assessments for standard equipment and operation are with the kind permission
of Dr. Ken MacNeil, School of Chemistry, University of Bristol.
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Activity being assessed:
Note any activity to be used which entail risk (e.g. use of glass vacuum apparatus, high
pressures, high voltage, radiation, high temperatures). Give reference to any special protocols to
be followed, and if appropriate attach copies to the risk assessment form. State any additional
precautions taken to minimise risk.
Known or expected hazards associated with the activity:
FOR EACH CHEMICAL, read the MSDS and note:a) Particular hazards (e.g. highly toxic, carcinogenic, corrosive, flammable, pyrophoric,
explosive, volatile, dust hazard). Note any dangerous combinations of properties (e.g. volatile
and toxic).
b) Requirements for safe handling (e.g. fume cupboard, inert atmosphere, low temperature).
c) How to dispose of residuals
 Dispose to drain, with water dilution
 Neutralise, then to drain with suitable dilution
 To flammable liquid waste receptacle
 To non-flammable liquid waste receptacle
 Keep for recovery/recycling
 Keep for special disposal later (e.g. heavy metals)
 Double bag and dispose to dry waste
 Special procedure (specify)
Incompatible materials (special precautions)
Note any dangerously incompatible materials and hazards arising from contact of any reagents
and substances used with common materials such as paper, benches, hoses, etc.
Measures to be taken to reduce the level of risk
Include hazards of previously unknown products.
Location of work – laboratory, open bench, fume cupboard
Level of risk remaining:
Likelihood and consequences of any accident or unforeseen events whilst carrying out the
activity. When this has been done, choose the appropriate procedure:a) Close supervision and/or attendance of trained first-aider needed.
b) Specific approval of supervisor needed.
c) Training is needed prior-to or during the operations specified.
d) Training is complete and only general laboratory competence required.
e) No risk perceived.
Emergency action:
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a) Any special requirements to deal with accidental spillage or leakage.
b) What to do in the event of accidental exposure (skin contact, inhalation, etc.).
Appendix 6.1
Reagent
Flash points
Triphenylphosphine
Amount
used/prod
uced
180 °C closed cup
0.23 g
No data
available
4 mL
-17.0 °C closed cup
10 mL
4.0 °C closed cup
15 mL
Not
applicable
(N. A.)
ca. 2.0g
Dichlormethane
Acetone
Toluene
Tin(IV) iodide
Iodine
No data
available
Harmful in contact with skin.
Causes severe skin burns and eye damage.
May cause an allergic skin reaction.
Harmful if inhaled.
2.5 g
Silver nitrate
No data
available
May intensify fire; oxidiser.
Harmful if swallowed.
Causes severe skin burns and eye damage.
ca. 0.01 g
Sodium iodide
Tin
No data
available
Not
applicable
(N. A.)
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Expected hazards
Harmful if swallowed. May cause an allergic
skin reaction. May cause damage to organs
(Nervous system) through prolonged or
repeated exposure if inhaled.
Harmful if swallowed.
Causes skin irritation.
Suspected of causing cancer.
Highly flammable liquid and vapour.
Causes serious eye irritation.
May cause drowsiness or dizziness.
Highly flammable liquid and vapour.
May be fatal if swallowed and enters airways.
Causes skin irritation.
Causes serious eye irritation. Harmful if
inhaled.
May cause drowsiness or dizziness.
Suspected of damaging fertility or the unborn
child.
May cause damage to organs.
Harmful if swallowed. Harmful in contact with
skin. Causes severe skin burns and eye damage.
May cause an allergic skin reaction. Harmful if
inhaled. May cause allergy or asthma
symptoms or breathing difficulties if inhaled.
Causes skin irritation.
Causes serious eye irritation.
0.25 g
0.1 g
Not a dangerous substance or mixture
according to the Globally Harmonised System
(GHS).