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Laboratory Safety Compliance
Published in Frank R. Spellman, Surviving an OSHA Audit, 2020
At a minimum, daily/before use and quarterly inspection and testing should be conducted on laboratory fume hoods. The daily or before operation inspection should consist of an airflow check. A simple qualitative check that can be used to check for proper airflow and exhaust is the ribbon or tissue paper check. During this test, a ribbon or a piece of tissue paper (be careful not to lose control of these, for they could “gum-up” the system) is placed at the hood opening to determine if it reflects directional airflow. Daily and before each use, the hood gages and monitors should be checked for proper operation within a predetermined range of operation.
Testing and Balancing Fume Hood Systems
Published in Samuel C. Sugarman, Testing and Balancing HVAC Air and Water Systems, 2020
A laboratory fume hood is a ventilated, box-like structure that captures, contains, and exhausts contaminated fumes, vapors, and particulate matter generated inside the enclosure. Laboratory fume hoods are made of various materials such as epoxy-coated steel, epoxy resin, fiberglass, polypropylene, PVC and stainless steel.
Tables and Guidelines for Laboratory Safety
Published in Thomas J. Bruno, Paris D.N. Svoronos, CRC Handbook of Basic Tables for Chemical Analysis, 2020
Thomas J. Bruno, Paris D.N. Svoronos
Most of the chemical fume hoods considered here consist of a cabinet or enclosure set at waist level (above a table or storage cabinet) that is connected to a blower located above the hood or external to the hood through a duct system. The cabinet has an open side (or sides) to allow a user to perform work within. A movable transparent sash separates the user from the work. Most chemical fume hoods have a sill that functions as an airfoil at the work surface below the sash. The connection to the blower might be by use of a v-belt, or it may be direct drive. This allows provision of a smooth flow of air with minimal turbulence. In some installations, axially mounted blowers are used, especially if multiple hoods are ducted into a common blower. Baffles located in the rear of the cabinet provide control of the air flow patterns and can usually be adjusted to provide the best air flow around the experiment or procedure being performed. Many chemical fume hoods are equipped with air flow indicators, low flow monitors and alarms, and differential pressure sensors to allow the user to operate safely. The major types of chemical fume hoods include the standard/conventional, walk-in, bypass, variable air volume, auxiliary air, or ductless types. Additional types include snorkels and canopies that are portable. Each type must be understood to be operated most efficiently within specifications (see the section below on safe operation).
A greener tetraphenylporphyrin synthesis and metallation: an undergraduate teaching experiment
Published in Green Chemistry Letters and Reviews, 2023
Matthew A. Nitka, Katarina E. Zerbee, Julianne M. Dee, Matthew A. Cranswick, Edward P. Zovinka, John R. De Backere
Proper protective equipment (e.g. goggles, lab coat, nitrile gloves, etc.) should be worn at all times and work performed in a fume hood where possible. Ethyl acetate (EtOAc), ethanol (EtOH), methanol (MeOH), and propionic acid are highly flammable. Refluxing solvent and hotplates can cause burns. Metal salts are generally toxic and environmentally hazardous, and the cobalt and nickel acetate salts are suspected carcinogens. Propionic acid is corrosive and can cause severe skin and eye irritation or damage.