Chemical Safety Lecture Notes PDF

 LECTURE LESSON 01: CHEMICAL SAFETY Unit 01: Hazard and Its Classifications Introduction: “Safety First”. This is a slogan that can usually be seen in workplaces which signifies the need to prioritize safety above anything else in the work environme...

 LECTURE LESSON 01: CHEMICAL SAFETY Unit 01: Hazard and Its Classifications Introduction: “Safety First”. This is a slogan that can usually be seen in workplaces which signifies the need to prioritize safety above anything else in the work environment. The safety of the working individuals is very important because it is directly related to the productivity of not just the workers but of the institution. In addition, a safe workplace also entails reduction on costs related to the decrease in working capacity and/or to the increase in accidental insurance. Above all, human life is essential; it must be taken care of. As future engineers, the workplace is where most of the day is spent and it is where exposure to different types of hazards may be experienced and many will be work as leaders who are to oversee the safety of his or her subordinates. With this, a basic knowledge on how safety protocols work is needed, as part of protecting ourselves and others. Chemical safety refers to the condition of being safe from undergoing hurt or harm during an occurrence of chemical incident. A chemical incident is an unintentional event that may threaten to expose or do expose members of the public to a chemical hazard. Learning Objectives: After successful completion of this lesson, the students are expected to: 1. Demonstrate “Chemical Safety” and discuss its importance. 2. Differentiate the terms “hazard” and risk”. 3. Enumerate, discuss and give examples of different hazard classifications Course Materials: What is a hazard? Hazard is defined as any source of potential harm, damage or adverse effect on someone of something. For instance, (1) a fast-running vehicle is a hazard to a person who is crossing the same road the vehicle is moving on; (2) a poorly treated industrial wastewater is a hazard to the body of water where the wastewater is being dumped; (3) an x-ray radiation is a hazard to a radio technologist operating the machine. What are Hazardous Substances? A hazardous substance is any chemical that presents physical or health hazard. Under OSHA’s Health Communication Standard (HCS), Risk, on the other hand, is the probability that a person or a thing is harmed or damaged when exposed to a hazard. It talks about (1) the chance of the person crossing a road be hit by a fast moving vehicle, (2) the chance of the body of water to be polluted from the harmful substance present in the wastewater and (3) the chance that the radio technologist get a disease caused by his exposure to the x-ray radiation. The higher the risk, the higher the probability of getting harmed from the exposure to the hazard. How are hazards classified? 1. Physical hazards are factors within the environment that may cause harm on the body. Physical hazard means a chemical that is a combustible liquid, a compressed gas, explosive, flammable, an organic peroxide, an oxidizer, pyrophoric, unstable (reactive) or water-reactive. Physical hazards are classified as fire hazard, reactive hazard and explosion hazard. Health hazard means a chemical that may cause acute or chronic health effects to exposed personnel. They are classified as either systematic effect or target organ effect. According to Republic Act 6969, a substance is hazardous when it present either a short-term acute hazard or long-term chronic toxicity. Acute hazards are those that have obvious and immediate impact while chronic hazards are those that have more hidden, cumulative and long term impact. even without touching it and they are generally discernible and perceptible. Examples are slippery floors, poor lighting, and excessive noise. 2. Chemical hazards refer to the chemical substances that may cause harm upon exposure to them. Examples are gases, fumes and liquids. 3. Ergonomic hazards are physical factors in the environment that may cause problems on the musculoskeletal system. Examples are poor workstation design, repetitive movements and poor workflow. 4. Radiation hazards are the factors in the environment that causes exposure to the emission of electromagnetic waves. Examples are x-rays, ultraviolet rays and lasers. 5. Psychological hazards are the aspects of the working environment that may affect the mental health of the individuals such as workload, stress and discrimination. 6. Biological hazards are biological substances that may threat the health of living organisms exposed to it such as viruses, bacteria and animals. Watch the following videos for further education, information and review: ASSIGNMENTS, EXAMINATIONS and QUIZZES will be based from our LECTURES and these VIDEOS…  Chemical Safety and Hazard Communication https://www.youtube.com/watch?v=Hvt4sJwrMCQ  The Difference Between A Hazard And A Risk https://www.youtube.com/watch?v=ToaVW4nSdBA https://www.youtube.com/watch?v=PZmNZi8bon8  Risk Assessment (Hazard Identification) https://www.youtube.com/watch?v=-QbeJvjVWWg Activities and Assessments: ASSIGNMENT (SUBMIT your answers at GOOGLE CLASSROOM ASSIGNMENT SECTION ) 1. What is Hazard? 2. A substance is a mixture made up of the following components Ammonium Nitrate 71% Water 16% Diesel fuel 8% An emulsifier composed of: Oleic Acid 3% Sodium Hydroxide (50% aq. soln.) 2% The mixture has a paste like consistency which does not meet the GHS definition of a liquid. Question: Considering the components of this mixture, identify the possible physical hazard classifications for this mixture, providing reasons for your choice. Possible classifications are : ( encircle your answer ) a) Explosive – will need to consider if the mixture is intended as an explosive and which of the complex UN tests it passes or fails b) Oxidizing substance as a result of the ammonium nitrate component c) Flammable solid ‐ consider whether or not the emulsified diesel fuel enable the substance to burn as specified in the UN tests (test are essentially apply a small amount of energy and determine whether a line of the substance would burn faster than 2.2m/s. 3. A highway patrol officer presents you with a number of small round disks about 30mm in diameter apparently made of a soft metal of some sort. The disks are marked “railway fog signal.” The officer explains that the disks were picked up from the side of a main interprovincial highway and, considering the remnants of a similarly labelled cardboard box found nearby, appear to have fallen from a truck travelling at high speed. When shown a copy of the GHS ‘explosive’ pictogram, the officer agrees that part of the box found may have had a similar symbol on it. (The remnants of the box are not available to you.) Question: Classify these articles, explaining how you derived the classification of your answer. a) Gift b) Explosives c) Biodegradable Material  d) Flammable 4. By Dec. 1, employers are required to have trained workers on chemical Safety Data Sheets and labels as part of OSHA’s updated Hazard Communication Standard. Both new SDSs and labels will feature pictograms, and workers must know what hazards these pictograms represent. Can you match the pictograms below with the corresponding hazards? Answers: 1. __________ 5. ___________ 2. __________ 6. ___________ 3. __________ 7. ___________ 4. __________ 8. ___________ 5. In your own words differentiate Hazard from a Risk.