Objectives To investigate the cause of many people with acute chlorine gas stimulus response occurred in the indoor swimming pool, and to avoid the occurrence of similar incident in the future.
Methods The authors investigated the indoor sngimming pool facilities and stimulus response patients by means of pidemiolog survey. The tests of swimming pool air quality were based on the Examination Methods for Public Places-Part 1: physical Parameters(GB/T 18204.1-2013), and the Examination Methods for Public Places-Part 2: Chemical pollutants (GB/T 18204.2-2014), the test of swimming pool water were based on Standards for drinking water Quality(GB/T 5750-2006), the Methods of Microbiological Examination for Water in Swimming Pool-Determination of Aerobic Bacterial Count(GB/T 18204.9-2000), and the Methods of Microbiological Examination for Water in Swimming Pool-Determination of Coliform Bacteria(GB/T 18204.10-2000). The evaluation was based on the Hygienic Standard for Swimming Place (GB 9667-1996).
Results The tests of swimming pool water residual chlorine concentration were 0.07 and 0.08 mg/L, which were lower than that of the Hygienic Standard for Swimming Place (GB 9667-1996). The tests of swimming pool air quality and swimming pool water health quality were comformed to the Hygienic Standard for Swimming Place (GB 9667-1996).
Conclusions The temporary member of the stuff made a faulty operation, who mixed commercial concentrated hydrochloric acid with water disinfection liquid(sodium hypochlorite solution) for mats and strainer cleaning; a violent and exothermic chemical reaction occurred immediately between a strong acid and a strong alkali, which produced enomous amount of todic and pungent chlorine gas. It was the unique cause of the event.
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