Question

1. the smcl for ________ is 0.05 mg/l. undesirable effects include coatings in distribution piping, brown blotches in laundry items and black precipitates, and a taste to water above 0.15 mg/l. unless the precipitate is removed, precipitates reaching pipelines will promote bacterial growth. liver cirrhosis has arisen in controlled feeding of rats. it is essential for proper nutrition, and diets deficient in manganese will interfere with growth, blood and bone formation, and reproduction.

a. chloride
b. tds
c. zinc
d. manganese

1. the smcl for ________ is 500 mg/l. the undesirable effects include adverse taste effects at greater than 500 mg/l, the deterioration of distribution systems as well as domestic plumbing and appliances, and it causes precipitates to form in boilers and other heating units.

a. chloride
b. tds
c. zinc
d. manganese

Explanation:

1. The passage explicitly states that diets deficient in manganese interfere with growth, blood and bone formation, and reproduction, and lists the SMCL and undesirable effects matching manganese.
2. Chloride has a Secondary Maximum Contaminant Level (SMCL) of 500 mg/L, with associated issues of bad taste, plumbing deterioration, and boiler precipitates as described.

Answer:

1. d. manganese
2. a. chloride