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Chemwatch:4650-14 Page 6 of 14 Issue Date:11/12/2018 Version No:8.1.1.1 API Pond Freshwater Nitrite Test Solution Print Date:06/21/2019 Lower end of the range Upper end of the range 1: Room air currents minimal or favourable to capture 1:Disturbing room air currents 2:Contaminants of low toxicity or of nuisance value only 2:Contaminants of high toxicity 3: Intermittent,low production. 3: High production,heavy use 4:Large hood or large air mass in motion 4:Small hood-local control only Simple theory shows that air velocity falls rapidly with distance away from the opening of a simple extraction pipe. Velocity generally decreases with the square of distance from the extraction point(in simple cases). Therefore the air speed at the extraction point should be adjusted,accordingly,after reference to distance from the contaminating source. The air velocity at the extraction fan,for example,should be a minimum of 1-2 m/s(200-400 f/min.)for extraction of solvents generated in a tank 2 meters distant from the extraction point. Other mechanical considerations,producing performance deficits within the extraction apparatus,make it essential that theoretical air velocities are multiplied by factors of 10 or more when extraction systems are installed or used. Personal protection 0 f) 0 Safety glasses with side shields Chemical goggles. Contact lenses may pose a special hazard;soft contact lenses may absorb and concentrate irritants.A written policy document,describing the wearing of lenses or restrictions on use,should be created for each workplace or task.This should include a review of lens absorption and adsorption for the class of chemicals in use and an account of injury Eye and face protection experience.Medical and first-aid personnel should be trained in their removal and suitable equipment should be readily available. In the event of chemical exposure,begin eye irrigation immediately and remove contact lens as soon as practicable.Lens should be removed at the first signs of eye redness or irritation-lens should be removed in a clean environment only after workers have washed hands thoroughly.[CDC NIOSH Current Intelligence Bulletin 59],[AS/NZS 1336 or national equivalent] Skin protection See Hand protection below Wear general protective gloves,eg.light weight rubber gloves. The selection of suitable gloves does not only depend on the material,but also on further marks of quality which vary from manufacturer to manufacturer.Where the chemical is a preparation of several substances,the resistance of the glove material can not be calculated in advance and has therefore to be checked prior to the application. The exact break through time for substances has to be obtained from the manufacturer of the protective gloves and.has to be observed when making a final choice. Personal hygiene is a key element of effective hand care.Gloves must only be worn on clean hands.After using gloves, hands should be washed and dried thoroughly.Application of a non-perfumed moisturiser is recommended. Suitability and durability of glove type is dependent on usage. Important factors in the selection of gloves include: frequency and duration of contact, chemical resistance of glove material, glove thickness and dexterity Select gloves tested to a relevant standard(e.g. Europe EN 374,US F739,AS/NZS 2161.1 or national equivalent). When prolonged or frequently repeated contact may occur,a glove with a protection class of 5 or higher (breakthrough time greater than 240 minutes according to EN 374,AS/NZS 2161.10.1 or national equivalent)is recommended. When only brief contact is expected,a glove with a protection class of 3 or higher(breakthrough time greater than 60 minutes according to EN 374,AS/NZS 2161.10.1 or national equivalent)is recommended. Hands/feet protection Some glove polymer types are less affected by movement and this should be taken into account when considering gloves for long-term use. Contaminated gloves should be replaced. As defined in ASTM F-739-96 in any application, gloves are rated as: Excellent when breakthrough time>480 min Good when breakthrough time>20 min Fair when breakthrough time<20 min Poor when glove material degrades For general applications,gloves with a thickness typically greater than 0.35 mm,are recommended. It should be emphasised that glove thickness is not necessarily a good predictor of glove resistance to a specific chemical,as the permeation efficiency of the glove will be dependent on the exact composition of the glove material. Therefore,glove selection should also be based on consideration of the task requirements and knowledge of breakthrough times. Glove thickness may also vary depending on the glove manufacturer,the glove type and the glove model.Therefore,the manufacturers'technical data should always be taken into account to ensure selection of the most appropriate glove for the task. Note:Depending on the activity being conducted,gloves of varying thickness may be required for specific tasks.For example: Thinner gloves(down to 0.1 mm or less)may be required where a high degree of manual dexterity is needed.However,these gloves are only likely to give short duration protection and would normally be just for Continued...