Quality Control Sample of Total Bacteria on Inner Surface of Central Air Conditioning Ducs|BNCC385060 |BNCC

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Quality Control Sample of Total Bacteria on Inner Surface of Central Air Conditioning Ducs

Culture medium	Peptone: 10.0, beef powder: 3.0, sodium chloride: 5.0, agar: 15.0,pH: 7.3±0.1(25 ℃)
Subculture procedure	After taking out the standard sample from the refrigerator at -20 ℃, equilibrating at (20±2)℃ for 10 min, opening it in the biosafety cabinet, adding 5mL of sterile water or sterile physiological saline to redissolve the freeze-dried quality control substance, fully mixing and then preparing (to be tested) standard sample suspension with a concentration of (1.9±0.4)× 10 5CFU/mL
Growth conditions	37°C, aerobic, 18-24h;
Storage conditions	-20 ℃, dark and refrigerated; ice bag transportation
Safety level	2
application	GB/T 18204.5-2013-Hygiene inspection methods for public places-Part 5: Central air conditioning and ventilation systems
Sharing mode	Public welfare sharing