Instructions for labor protection during demonstration experiments in chemistry

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Instructions on labor protection during demonstration experiments in chemistry. Full document

Occupational Safety and Health

Occupational Safety and Health / Standard instructions for labor protection

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Safe Operation

1. General requirements for labor protection

1.1. To conduct demonstration experiments in chemistry, pedagogical workers aged at least 18 years who have been instructed in labor protection, a medical examination and have no contraindications for health reasons are allowed. Students are not allowed to prepare and conduct demonstration experiments in chemistry.

1.2. Persons admitted to conducting demonstration experiments in chemistry must comply with the internal labor regulations, the schedule of training sessions, and the established work and rest regimes.

1.3. When conducting demonstration experiments in chemistry, workers and students may be exposed to the following hazardous and harmful production factors:

chemical burns when caustic chemicals come into contact with the skin or eyes when working with chemical reagents without personal protective equipment;
thermal burns due to inaccurate use of alcohol lamps and heating of liquids;
hand cuts due to careless handling of laboratory glassware
poisoning with vapors and gases of highly toxic chemicals during experiments in a faulty fume hood;
the occurrence of a fire due to careless handling of flammable and combustible liquids.

1.4. When conducting demonstration experiments in chemistry, the following overalls and personal protective equipment should be used: cotton gown, rubberized apron, goggles, rubber gloves.

1.5. The chemistry room must be equipped with a first aid kit with a set of necessary medicines and dressings in accordance with the Rules for first aid for injuries.

1.6. To conduct demonstration experiments, the chemistry room must be equipped with a fume hood.

1.7. Personnel are required to comply with fire safety rules, know the location of primary fire extinguishing equipment. The chemistry cabinet must be equipped with primary fire extinguishing equipment: two fire extinguishers, a box of sand and two capes made of fire-retardant fabric.

1.8. The victim or eyewitness of the accident must immediately inform the administration of the institution about each accident. In case of malfunction of equipment, fixtures and tools, stop work and inform the administration of the institution.

1.9. In the process of work, personnel must comply with the rules for wearing overalls, using personal and collective protective equipment, observe the rules of personal hygiene, and keep the workplace clean.

1.10. Persons who have failed to comply with or violate the instructions on labor protection are subject to disciplinary liability in accordance with the internal labor regulations and, if necessary, are subjected to an extraordinary examination of knowledge of the norms and rules of labor protection.

2. Labor protection requirements before starting work

2.1. Wear overalls, when working with alkali metals, calcium, acids and alkalis, prepare personal protective equipment for use.

2.2. Prepare for work and check the serviceability of equipment, instruments, laboratory glassware.

2.3. Before conducting demonstration experiments, in which the atmosphere of classrooms may be contaminated with toxic vapors and gases, check the correct operation of the fume hood.

2.4. Thoroughly ventilate the chemistry room.

3. Labor protection requirements during work

3.1. To assist in the preparation and conduct of demonstration experiments in chemistry, it is allowed to involve a laboratory assistant, it is prohibited to involve students for these purposes.

3.2. Demonstration experiments in chemistry, in which the atmosphere of classrooms may be contaminated with toxic vapors and gases, must be carried out in a working fume hood with ventilation turned on. Only a teacher (teacher) is allowed to prepare solutions from solid alkalis and concentrated acids, using porcelain laboratory glassware, filling it halfway with cold water, and then adding the substance in small doses.

3.4. When using a pipette, it is forbidden to suck up the liquid by mouth.

3.5. Taking a sample of solid alkali is allowed with a plastic or porcelain spoon. It is forbidden to use metal spoons and pour alkali from bottles over the edge.

3.6. Thin-walled laboratory glassware should be carefully secured in the clamps of the racks by slightly turning around the vertical axis or moving up and down.

3.7. Only thin-walled vessels may be used for heating liquids. It is forbidden to fill test tubes with liquid by more than a third before heating. The neck of the vessels when they are heated should be directed away from the students.

3.8. When heating liquids, it is forbidden to bend over the vessels and look into them. When heating glass plates, you must first uniformly heat the entire plate, and then conduct local heating.

3.9. It is necessary to demonstrate the interaction of alkali metals and calcium with water in chemical beakers of the VN-600 type filled with no more than 0,05 liters.

3.10. Solutions must be poured from the vessels so that when tilted, the label is on top. Remove the drop remaining on the neck with the edge of the dish where the liquid is poured.

4. Labor protection requirements in emergency situations

4.1. Pour the spilled aqueous solution of acid or alkali with dry sand, move the adsorbent from the edges of the spill to the middle with a scoop, collect it in a plastic bag and tie tightly. Clean spill area with neutralizing solution and then rinse with water.

4.2. When spilling flammable liquids or organic substances up to 0,05 l, extinguish the open fire of the spirit lamp and ventilate the room. If more than 0,1 l is spilled, remove students from the classroom, extinguish the open fire of the spirit lamp and turn off the power supply system of the room with a device from outside the room. Pour the spilled liquid with dry sand or sawdust, collect the wet adsorbent with a wooden scoop in a resealable container and ventilate the room until the smell disappears completely.

4.3. In the event of a spill of flammable liquids and their ignition, immediately evacuate students from the premises, report the fire to the nearest fire station and proceed to extinguish the fire with primary fire extinguishing equipment.

4.4. If laboratory glassware is broken, do not collect its fragments with unprotected hands, but use a brush and a dustpan for this purpose.

4.5. In case of injury, immediately provide first aid to the victim, inform the administration of the institution, if necessary, send the victim to the nearest medical institution.

5. Labor protection requirements at the end of work

5.1. Leave installations, devices in which substances of hazard classes 1, 2 and 3 were used or formed in a fume hood with working ventilation until the end of the lesson, after which the teacher (teacher) personally dismantles the installation, device.

5.2. Drain the spent aqueous solutions into a closed glass vessel with a capacity of at least 3 liters for their subsequent destruction.

5.3. Tidy up the workplace, put away all chemical reagents in the laboratory in lockable cabinets and safes.

5.4. Remove overalls, personal protective equipment and wash hands thoroughly with soap and water.

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