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The cause of the incident was the use of a rotor that was not approved for the particular unit. Most high-purity solvents are commercially available in specialized kegs or may be obtained from column purification systems (see section 7. Safety first model 2 scenes in the lab answers. 132) and the OSHA Laboratory Standard (29 CFR § 1910. In addition, oxygen, hydrogen, and helium are often used in the liquid state. Many of the accidents that occur in the laboratory can be attributed to improper use or maintenance of laboratory equipment.

Be aware that GFCIs are not fail-safe devices. The fire or explosion hazard is obvious when gases such as oxygen, hydrogen, methane, and acetylene are used. But there is another reason, which is sometimes overlooked: science can offer great job opportunities, even for those who are not aiming for a future as a research scientist. Polycarbonate is much stronger and self-extinguishing after ignition but is readily attacked by organic solvents. Laboratory personnel should be certain that all electrical equipment is well maintained, properly located, and safely used. Lab scenes in movies. Touch, taste, smell, you are told to do soTake how much of the chemicals from chemical bottles if you need it for an experiment? In carbon monoxide atmospheres, some alloys containing nickel or iron can generate carbonyls [e. g., Ni(CO)4] which are toxic when absorbed through the skin or inhaled. Alternatively, the apparatus may be pressurized and monitored for pressure drop over time.
Convenient ways to check for leaks include a flammable gas leak detector (for flammable gases only) or looking for bubbles after application of soapy water or a 50% glycerin–water solution. Find out about some of the less visible roles that keep the science happening. Flash arrestors are recommended for flammable gases. Do not use them for electrical, liquid, or metal fires. The leaking cylinder can be moved through populated portions of the building, if necessary, by placing a plastic bag, rubber shroud, or similar device over the top and taping it (preferably with duct tape) to the cylinder to confine the leaking gas. Exercise extreme caution in using liquid nitrogen as a coolant for a cold trap. Do not control the speed of an induction motor operating under a load by a variable autotransformer. Erasure of credit card and bank cards; disruption of small mechanical devices, such as analog watches and clocks; and disturbance of X-ray tubes. Model 2 scenes in the lab answer. Fail-safe devices, which can be either purchased or fabricated, can prevent the more serious problems of fires or explosions that may arise if the temperature of a reaction increases significantly because of a change in line voltage, the accidental loss of reaction solvent, or loss of cooling. Because it may catch on fireWhere shouldn't you point the open end of a test tube if you are heating or boiling the liquid inside it?
Protect mechanical vacuum pumps by cold traps, and vent their exhausts to an exhaust hood or to the outside of the building. SCBA is the only type of respiratory protective equipment suitable for emergency or rescue work. Alternatively, a temperature controller can be used to control the temperature of the bath precisely. 2), reviewing general precautions (section 7. For instance, operations involving a chemical hazard and sharp objects may require the combined use of a chemical-resistant glove and a cut-resistant glove.

Add permanent labels warning against the storage of food and beverages to all laboratory refrigerators and freezers. The use of water as a coolant in laboratory condensers and other equipment is common practice. Do not enter or reenter an unsafe area. The curator of the exhibition, Emily Scott-Dearing, worked for a year to create 'Craft and Graft' and spoke to members of some 20 different technician teams who maintain the vital services needed for the laboratory's research. You shouldn't point it at yourself or anywhere elseWith what should you pick up heated metals and glass? Especially hazardous materials may require special cleaning techniques, which should be solicited from the distributor. The manufacturer's instruction guide for the unit described similar incidents. Distilled waterWhich part of an electricity plug should you grab when unplugging it from its socket? To avoid electrical hazards, the oven must be grounded.

Any handheld heating device of this type that will be used in a laboratory should have GFCI protection to ensure against electric shock. Visually inspect all electrical cords monthly, especially in any laboratory where flooding can occur. • Keep the injured person warm. The following reminders are included for qualified personnel: • Always assume that a voltage potential exists within a device while servicing it, even if it is deenergized and disconnected from its power source. T/FFWhen should you report damaged electrical equipment?

Do not allow unprotected parts of the body to come in contact with uninsulated vessels or pipes that contain cryogenic liquids because extremely cold material may bond firmly to the skin and tear flesh if separation or withdrawal is attempted. In addition, the potential for a flood is greatly increased. Such guards are particularly important for pumps installed on portable carts or tops of benches where laboratory personnel might accidentally entangle clothing or fingers in the moving belt or wheels. Similarly, the relief pressure—the pressure at which the safety system (e. g., rupture disk or safety vent) will be triggered—and setting data should be stamped on a metal tag attached to installed pressure-relief devices, and the setting mechanisms should be sealed. Never use laboratory ovens to prepare food for human consumption. 5%, in atmospheres immediately dangerous to life, or for rescue or emergency work. Steam generated for general facility use may contain contaminants that could interfere with laboratory work.

1-2003 are recommended when working in laboratories and, in particular, when working with hazardous chemicals that present a splash hazard, with vapors or particulates, and with corrosives. Cells – fresh and frozen. • Orient pressure-relief devices with the vent side of the device directed away from the operator or. • Inspect the components of the centrifuge each time it is used: ο Look for signs of corrosion of the rotors. Careful labeling of samples placed in refrigerators and freezers with both the contents and the owner's name is essential. Create an account to follow your favorite communities and start taking part in conversations. 6 Ergonomics and Lifting. The frequency of tests and inspections varies, depending on the type of equipment, how often it is used, and the nature of its usage. Personnel should be familiar with the safe procedures for depressurizing the system, including the order in which to open valves or fittings. Some quick disconnects also incorporate check valves, which do not allow flow into or out of either half of the connection when disconnected. A laboratory specializing in the analysis of paint samples was asked to analyze pigmented polypropylene. Stencil or stamp identification on the cylinder itself, or provide a durable label that cannot be removed from the cylinder.

There have been numerous fires attributed to solvent stills, some resulting in serious injuries and extensive damage to the labs. 2. ex---ed w---s. 3. l---e c---------sfrayed cords, exposed wires, loose connectionsYou are allowed to use damaged electrical equipment, as long as it doesn't harm anyone. Under OSHA regulations, only equipment listed and approved by the Mine Safety and Health Administration and NIOSH may be used for respiratory protection. • When bringing ordinary electrical equipment such as vacuum cleaners and portable electric drills having series-wound motors into the laboratory for special purposes, take specific precautions to ensure that no flammable vapors are present before such equipment is used (see Chapter 6, section 6. Never rely on corks, rubber stoppers, and rubber or plastic tubing as relief devices to protect glassware against excess pressure; use a liquid seal, Bunsen tube, or equivalent positive-relief device. Caution must be applied when using argon, for instance as an inert gas for Schlenk or vacuum lines, because it condenses as a colorless solid at liquid nitrogen temperature. Use teflon tape on tapered pipe thread where the seal is formed in the thread area. Microwave ovens designed for the laboratory have built-in safety features and operation procedures to mitigate or eliminate these hazards.

This characteristic renders face-to-face piece fit less important than with other types of respirators. The material should not react with the process being studied, and the vessel must be of the proper size and configuration. Under some chemical conditions, cavitation is created in liquids that induces high-energy chemistry in liquids and tissues. Details of permissible operating conditions must be obtained from the manufacturer. Furnish all cylinders and equipment containing flammable or toxic liquefied gases (not vendor-owned) with a spring-loaded pressure-relief device (not a rupture disk) because of the magnitude of the potential risk that can result from activation of a nonresetting relief device. This overload protection is particularly useful for equipment likely to be left on and unattended for a long time, such as variable autotransformers (e. g., Variacs and powerstats), 2 vacuum pumps, drying ovens, stirring motors, and electronic instruments. D. none of the abovecContact lenses 1. should/shouldn't be notHow should you dress your hair properly? The use of steam-heated devices rather than electrically heated devices is generally preferred whenever temperatures of 100 °C or less are required. Also, if the system is closed after even a brief exposure to the atmosphere, some oxygen may have already condensed. By bringing the back of your hand close to it, and then find out if it feels hot or not.

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