1. The definition of pH is
a. The negative logarithm of the relative hydrogen ion concentration
b. The positive logarithm of the relative hydrogen ion concentration
c. The negative logarithm of the relative hydroxyl ion concentration
d. The positive logarithm of the relative hydroxyl ion concentration

2. How many buffers are recommended for proper calibration of a pH meter
a. 1
b. 2
c. 3
d. 4

3. What does DO refer to?
a. Dissolved organics
b. Dissolved oxygen
c. Direct oxidation
d. Diamino oxide

4. A DO sample should not be agitated or remain in contact with air because
a. The solids may not settle out
b. The gaseous content of the sample may change
c. The acidity in the sample will reduce the dissolved gases
d. The sample may give off toxic fumes

5. What is the primary advantage of using a DO probe and meter
a. Measurements can be made directly in the waste stream
b. Less care is needed in sampling
c. The probe and meter need little or nor preparation before using
d. Samples can be fixed and analyzed at the operator’s convenience

Answers:

1. A
2. C
3. B
4. B
5. A