Pests & Facilities第 130 / 240 题

What is the correct concentration range for a chlorine (bleach) sanitizing solution?

a.50 to 100 ppm
b.5 to 10 ppm
c.500 to 1000 ppm
d.2000 ppm or higher

解析

A chlorine sanitizer for food-contact surfaces should be about 50 to 100 ppm. Too little (5-10 ppm) will not sanitize, and too much (500+ ppm) is a toxic chemical hazard and can corrode surfaces. Test strips must be used to verify the concentration.

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