Risk Assessment and Scheme of Work for Preparation of 1M Ammonium Chloride Solution

This document provides a risk assessment and scheme of work for the preparation of 1M Ammonium Chloride solution. It includes hazards, controls, and emergency procedures. The accompanying scheme of work provides detailed instructions and resources required for the activity.

Faculty of Applied Sciences
Risk Assessment and Scheme of Work
Note: There is a legal requirement under the Management of Health & Safety at Work Regulations to undertake risk assessments. The absence of any risk assessment is a clear indication of legal non-compliance and inadequate safety
management. In conjunction with the legal requirement, the University policy states that ‘all managers and supervisors are required, so far as is reasonably practicable, to ensure that all workplace activities are subject to an adequate risk
assessment and are planned and controlled so as to be safe and free from risks to the health or safety of persons, or harm to the environment, so far as is reasonably practicable’, and ‘that all persons are informed of any hazards to their
health and safety, or to the environment, which may be inherent in the equipment, substances or work activities and are advised of the precautions to be taken’.
Name: Sabina Rokib Tel Num: Date of Assessment:09/04/2018 Date for Review:
Venue:
Fleming basement laboratories B01 and B03
Activity Title:
Risk assessment of 1M Ammonium Chloride
Activity Overview:
Preparation of 100 ml solution of 1M Ammonium Chloride
Assessors Name: Noel Carter Assessor’s Signature: Date: Contact Telephone Number:
Sciences Manager: Sciences Manager’s Signature: Date: Contact Telephone Number:
Victoria Hann
What are the hazards?
*Use the accompanying Prompt List as a guide for
identifying some of the potential hazards and controls
Who might be harmed, and how? What controls are currently in place to
prevent harm?
Whatadditional controlsdo you need to
manage this risk?
What is the overall
level of risk?
*Use the accompanying risk
matrix to identify the level of risk
Acute toxicity (oral, dermal, inhalation)
(category 4: environmental hazards)
The person preparation the solution or using
the solution
Use of face mask If medical advice is required then keep the product
container or the packaging label in handy for prompt
information support
Keeping the reagent out from the reach of children
Careful reading of the packaging label and usage
L: Low Risk
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instruction before use
Proper hazard management instructions in the form
of poster
Skin Irritation (category 2: physical hazards) The person preparation the solution or using
the solution
Washing of hands thoroughly after handling (P264)
Use of protective gloves/protective clothing/eye
protection/face protection (P280)
Washing with plenty of soap and water if irritation on
skin (P302+P352)
If skin irritation occurs: immediately seek medical
advice/attention (P332+P313)
Washing of the contaminated clothing before use
(P362)
If medical advice is required then keep the product
container or the packaging label in handy for prompt
information support
Keeping the reagent out from the reach of children
Careful reading of the packaging label and usage
instruction before use
Staying self cautious
M: Medium injury
Serious Eye Irritation (Category 2A: physical
hazards)
The person preparation the solution or using
the solution
Washing eyes with splash of water (P264)
Use of protective eye protection/face protection
(P280)
Rinse cautiously with water for several minutes via
removal of contact lenses (if any) (P305+P351+P338)
If the eye irritation persists even after rinsing with
water then medical attention is advised (P337+P313P)
If medical advice is required then keep the product
container or the packaging label in handy for prompt
information support
Keeping the reagent out from the reach of children
Careful reading of the packaging label and usage
instruction before use
M: Medium injury
May cause an allergic skin reaction
(category 1)
The person preparation the solution or using
the solution
Avoidance of breathing of the chemical via nose
(P261)
Prevention of the use of contaminated clothing (P272)
Use of protective skin protection like glovers, face
masks and aprons (P280)
Washing of contaminated clothing before reuse (P363)
Disposal of the used materials like gloves or face mask
(P501)
If medical advice is required then keep the product
container or the packaging label in handy for prompt
information support
Keeping the reagent out from the reach of children
Careful reading of the packaging label and usage
instruction before use
Working under expert supervision
Detailed hazard manual
I (Insignificant) to L (Low
risk)
Harmful in contact with skin
(category 4)
The person preparation the solution or using
the solution
Use of protective covering like gloves, aprons or lab
coats and face masks (P280)
Washing off the exposed area with adequate soap and
running water (P302+P352)
Immediate seeking of the medical support in case of
instability in health (P312)
Washing of the contaminated clothing before reuse
If medical advice is required then keep the product
container or the packaging label in handy for prompt
information support
Keeping the reagent out from the reach of children
Careful reading of the packaging label and usage
instruction before use
Working under expert supervision
L: Low Risk
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NB: Insert additional rows if required
Additional Information (Refer to COSHH form where appropriate)
General control measures in place:
Emergency Procedures (ie First aid requirements/fire safety/contamination)
In case of significant skin or eye irritation immediate contact with the physicians is highly recommended with immediate measures.
Ammonium Chloride should never be swallowed and in case that happens then the physician needs to be contacted immediately
Special measures if required (iechemical spill control/containment/handling/disposal):
In case of the solution spillage: Rinse the area with paper towel and then discard the same in the bin of soft chemical waste.
The solution must be handled with care via use of gloves and protective eye glasses
Disposal: Unused solution can be discarded inside a water basin and the container should be reused after autoclaving.
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Risk Assessment Scheme of Work
Note: The risk assessment scheme of work is required to provide accompanying information to ensure the planned activity and required resources match the risks assessed for. This will
ensureparticipants of the activities understand where the risks stem from, and also to ensure that the session is set up in an applicable manner to ensure the resources are prepared with
the activity description in mind.
Subject Area/Topic Activity Description(e.g. Protocol, and this must be sufficiently detailed to allow for an
informed decision to be made about the risks from the activity)
Resources Required
Chemistry
Molecular weight of Ammonium Chloride= 53.491 grams/mole
V1/S1 = V2/S2
Therefore S2 (for 1 molar/100 ml)= 53.491/0.1 = 5.3491 = 5.35 grams (approx) of Ammonium
Reagents required: Ammonium Chloride and Double distilled water
Glass ware required: 100 ml measuring cylinder, 100 ml conical flask, Screw cap bottle
(all glassware must be autoclaved)
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Chloride (NH4Cl)
1. 5.35 grams of NH4Cl is weighed
2. Placed inside the beaker
3. NH4Cl is dissolved under 80 ml of double distilled water or de-ionised water in a 100 ml of
conical flask
4. The crystalline salt is dissolved via magnetic stirrer in order obtain clear solution
5. The entire solution is then transferred inside a 100 ml of measuring cylinder and the 20 ml
of volume is then makeup via adding double distilled water and then adjusting the volume via
watching the lower meniscus
6. 100 ml of 1 M NH4Cl is formed and then stored inside screw-cap bottle at room
temperature in laboratory shelve via final pH measurement (pH should be 7)
Equipments: Digital weight machine (lab) and magnetic stirrer unit, pH meter
Accessory equipments: Spatula for measuring the reagent
Safety equipments: Hand gloves, Lab coat or apron, face mask and protective eye glass
Writing copy for molarity calculations
NB: Insert additional rows if required
Signatories:
Note: All staff involved in the delivery or supervision of the practical work outlined above must read and sign the risk assessment as a record of awareness of the potential hazards inherent within the activities. This should include
academic and support staff. Note: For high risk, and very high risk activities, multiple signatories are required.
Print Name/Job Title Signature Date Print Name/Job Title Signature Date
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