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, the same target as a chlorine solution, and check with chlorine strips
c.Use 500 ppm to build in a wider safety margin and skip the test kit entirely
d.Pour in quat concentrate until the water turns visibly cloudy, then stop pouring
Giải thích
Quaternary ammonium sanitizer must be mixed to the manufacturer's specified concentration, commonly about 200 ppm, and confirmed with a quat-specific test kit. Chlorine's 50 to 100 ppm range is a different chemistry and chlorine strips will not read quats at all, so both the number and the strip in that option are wrong. Overdosing to 500 ppm leaves an unsafe residue rather than extra protection, and cloudiness tells you nothing about concentration.
Trích dẫn luật: FDA Food Code §4-501.114Luyện miễn phí toàn bộ 500 câu hỏi — không cần đăng ký.
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