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Book 2 Ch. 4 - Fluoridation Practice Quiz

front 1

Three types of fluoride chemicals are used in drinking water treatment. These are sodium fluoride, fluosilicic acid and what other type?

back 1

Hydrofluosilicic acid solution

front 2

What is the SDWA Primary Contaminant MCL for Fluoride?

back 2

4.0 mg/L

front 3

Mottling of a persons teeth (brown staining) occurs at fluoride levels of what?

back 3

1.5 mg/L

front 4

What is a major cause of over exposure to fluoride?

back 4

Breathing fluoride dust

front 5

What are obvious signs of fluoride poisoning by ingestion?

back 5

Vomiting, diarrhea

front 6

Which statement about gravimetric feeders is correct?

back 6

The amount fed is measured on the basis of the weight of the chemical

front 7

If significant overfeeding of fluoride occurs, what should the plant operator do?

back 7

Shut down the plant, begin flushing affected water mains and notify local and state health officials

front 8

What factors must the design of a fluoridation system incorporate?

back 8

Methods of preventing overfeeding and backsiphonage

front 9

What is the Secondary contaminant MCL for Fluoride?

back 9

2.0 mg/L

front 10

What is the pH value of hydrofluosilicic acid (H2SiF6)

back 10

1.2