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Categories: General Interest
What level of exposure to methylene blue is harmful to students/teachers with G6PD deficiency? I’ve used this substance as a biological stain for more than twenty five years, but it wasn’t until this September, when a colleague had a student with this... read moreCategories: General Interest
I’m trying to find information regarding the safe use/setup or acid baths to clean/neutralize glassware etc., used from experiments. Any assistance would be... read moreCategories: General Interest
Bunsen burners are used extensively as a heat source in school laboratories. The Fire Code (Section 2.4.4.4) states that: ‘Devices having open flames shall be securely supported by incombustible holders and located or protected so as to prevent accidental... read moreCategories: General Interest
One of our science teachers visited the STAO Conference in the fall and brought back an exercise on extracting a circuit from a disposable camera. He is keen for all of the grade 9 science students to complete the lab. However, several of the science teachers have... read moreCategories: General Interest
I wish to enquire about disposal of hazardous materials/wastes generated in a science program at secondary schools. Specifically I am wondering if STAO Safety Committee is aware of any ‘standard operating procedures’ for handling and disposing of hazardous... read moreCategories: General Interest
During an Occupational Health, Safety and Environment (OHS&E) Audit the following was raised by the auditor: ‘The permanently installed eyewash stations are connected to the cold water lines. The water dispensed by these devices should be lukewarm to ensure... read moreCategories: General Interest
Do ‘Flammables Storage Cabinets’ and ‘Corrosives Storage Cabinets’ need to have separate ventilation than what already exists in the... read moreCategories: General Interest
I was teaching a grade eleven chemistry class. The class was just before lunch. We were using 2 mol/L of sodium hydroxide. A female student spilt the dilute sodium hydroxide on her dark brown corduroy pants but it was difficult to see how much without a very close... read moreCategories: General Interest
A school custodian, collecting waste materials to be taken to the local landfill site, started a fire when he added some broken glass from a ‘Broken Glass’ container to the regular garbage, which contained paper towels and some unused potassium... read moreCategories: General Interest
A substitute science teacher was conducting a common introductory lab in the grade nine applied chemistry strand, identifying unknown chemicals (salt, baking soda, chalk, sodium nitrate, and sodium thiosulphate) in numbered containers using physical properties. Prior... read more