Question: Working periods may be split into several sessions for the purpose of sampling to take account of rest and meal breaks etc. Exposure is assumed

Working periods may be split into several sessions for the purpose

Working periods may be split into several sessions for the purpose of sampling to take account of rest and meal breaks etc. Exposure is assumed to be zero during the periods 1030 to 1045. 1245 to 1315 and 1415 to 1430. Calculate the TWA of 8 hours of metil mercaptan for this condition? 13 marks of Working period Concentration of Metil Mercaptan Duration (mg.m) sampling (h) 0800-1030 0.32 25 1045-1245 0.07 20 1315-1415 0.2 1.0 1430-1600 0.1 1.5 0.32 mg/m3 3.20 mg/m3 0 2.55 mg/m3 0.36mg/m3

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