设施、清洁与虫害第 290 / 320 题
A manager sets up a quaternary ammonium (quat) sanitizer solution. How should the correct concentration be determined?
a.Follow the manufacturer's directions, commonly around 200 ppm, and verify with a quat test kit
b.Use exactly 50 ppm as for chlorine
c.Pour until the water turns cloudy
d.Use 500 ppm to be extra safe
解析
Quaternary ammonium sanitizer must be mixed to the manufacturer's specified concentration, commonly about 200 ppm, and confirmed with a quat-specific test kit. Concentrations for quats differ from chlorine, so chlorine's 50 to 100 ppm range does not apply. Guessing by appearance or overdosing wastes product and can leave unsafe residue.
法律依据: FDA Food Code §4-501.114免费刷完整 320 道题库 — 无需注册。
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