Concentration and particle size distribution of bacterial aerosols in the cabin air of a naval vessel in the Gulf of Aden

Abstract

Objective To monitor continuously the concentration and particle size distribution of bacterial aerosol in the cabins of a large vessel deployed in the Gulf of Aden, so as to provide scientific evidence for the control of ship air pollution. Methods With a CA6 and CA2 Andersen impact sampler, bacterial aerosol in the cabins was enriched quantively and particle sizes were analyzed accordingly. Results (1) The bacterial aerosol concentration in the survey areas was within the range of 102–103 CFU/m3. (2) The bacterial aerosol particle sizes in 51%–62% cabins were between 0.65–4.7 μm. Conclusions (1) Although the microbial contamination levels in the survey area were relatively low, potential health and safety hazards still existed, provided particle sizes and certain conditional pathogenic bacteria were evaluated simutaneously. (2) Acceptable thresholds and evaluation systems for bacterial pollution in the cabin air of various ships, and effective purifying and disinfecting procedures should be established, so as to ensure the health of the ship crew. Key words: Cabin; the Gulf of Aden; Bacteria; Aerosol