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Humans as the subject of investigation (3)
including tasting, eating & drinking and chemicals on the skin
See also CLEAPSS Student Safety Sheets 3, 6 and 7. Investigations
Hazardous chemicals may be placed on the skin during evaporation tests or when t investigating perspiration. Where possible, it is safest to use substances which are chemicals are
deliberately intended for skin use, eg surgical spirit. TOXIC
placed on skin
Cobalt chloride (or thiocyanate) is TOXIC by inhalation but this risk is negligible when impregnated on paper. It is a sensitiser so skin contact must be minimised, although there is no evidence of problems from typical school use. Investigations
Eating and drinking should not take place in laboratories and in some circumstances it involving
t may be illegal under the COSHH Regulations. tasting, eating
Use of disclosing tablets in accordance with the manufacturer’s instructions is considered and drinking
low hazard. Tasting small amounts of dilute solutions (eg, sugar, salt) must be done under hygienic conditions, using a drinking straw, cotton bud or impregnated filter paper. PTC (phenyl thiocarbamide, phenylthiourea, PTU), used in genetics testing, is TOXIC, and must be used only in carefully controlled very small amounts. Consuming alcohol in any form or caffeine in the form of ProPlus tablets is not acceptable. Use caffeine in cola drinks or coffee instead but limit total caffeine intake by avoiding it before and after testing. Limited amounts of Red Bull might be used if students drink it anyway, although it contains other components as well. Typical control measures to reduce risk
• Ensure only willing volunteers are used and reassure them if results are exceptional or surprising. • Use water or surgical spirit for testing evaporation on skin. • If using cobalt chloride (or thiocyanate) paper on the skin, handle with forceps and wash skin afterwards. • Do not conduct taste tests in laboratories; use dining areas or food technology rooms. • Observe scrupulous hygiene – no sharing of cups, spoons, straws, etc. • Use only specially -purchased food- or pharmaceutical-quality chemicals for tasting. Assessing the risks
• What are the details of the activity to be undertaken? What are the hazards?
• What is the chance of something going wrong?

Eg, Could somebody taste the wrong substance by accident or as a result of mischief? • How serious would it be if something did go wrong?

Eg, Could it be life -threatening? • How can the risk(s) be controlled for this activity?

Eg, Can it be done safely? Does the procedure need to be altered? Emergency action
Hazardous chemicals in mouth Wash out mouth.
Hazardous chemicals
Wash out mouth. Do NOT make victim vomit. See a doctor. swallowed
For further information consult the latest edition of the CLEAPSS® Hazcards® or Laboratory Handbook. CLEAPSS 2013

Source: http://www.cleapss.org.uk/attachments/article/0/SSS08.pdf?Secondary/Science/Student%20Safety%20Sheets/

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