Annual Education Kit VII Quiz 3 (0.20 CPD)

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

Making Sense of an Incomplete Water Analysis (At least 8 correct answers are required to pass)

Email *

First Name: *

Last Name: *

Company Name: *

1. Which of the following is NOT a necessary parameter to for cation-removal applications?

1 point

a. Concentration of iron

b. Concentration of arsenic

c. Concentration of manganese

d. Hardness concentration

Clear selection

2. Why is the sulfate concentration an important consideration when using anion exchange to remove arsenic? (Note: Answer's not given in the article. WQA certified personnel should know what to look up to get the answer.)

1 point

a. High sulfate concentration will irreversibly foul anion resin

b. The resin's higher affinity for sulfate can lead to arsenate "dumping"

c. Sulfates interfere with pH correction chemicals

d. Sulfates will oxidize arsenic III to arsenic V

Clear selection

3. If a TDS measurement is not taken, which parameter can be used to calculate TDS?

1 point

a. Hardness concentration

b. Iron concentration

c. Silica concentration

d. Conductivity

Clear selection

4. What is the rule of thumb for estimating calcium and magnesium concentration from hardness concentration?

1 point

a. Calcium concentration is 2/3 of the hardness concentration, and the remainder is magnesium, all in ppm CaCO3.

b. Magnesium concentration is 2/3 of the hardness concentration, and the remainder is calcium, all in ppm CaCO3.

c. Calcium concentration is 2/3 of the hardness concentration, and the remainder is sodium, all in ppm CaCO3.

d. Magnesium concentration is 2/3 of the hardness concentration, and the remainder is sodium, all in ppm CaCO3.

Clear selection

5. If the inlet conductivity is 600 microsiemens, what is the TDS (in ppm CaCO3)?

1 point

a. 2.80

b. 217.4

c. 237.2

d. 600.5

Clear selection

6. If the sodium concentration is not provided as part of the water analysis, how should it be calculated?

1 point

a. The sodium concentration will be 1/3 of the hardness concentration.

b. The sodium concentration will be 1/3 of the TDS.

c. The sodium concentration will be the difference between the conductivity (in S) and TDS in ppm CaCO3.

d. The sodium concentration will be the difference between TDS and the hardness concentration, both in ppm CaCO3.

Clear selection

7. What information is needed to convert alkalinity as HCO3- to CaCO3?

1 point

a. The equivalent weight of free CO2.

b. The equivalent weight of HCO3.

c. The concentration of CaCO3.

d. The concentration of HCO3.

Clear selection

8. Consider the initial anion water analysis given in the article. How can the sulfate concentration be calculated, if it is not measured as part of the water analysis?

1 point

a. Sulfate concentration will be equal to the difference between the TDS concentration and the sum of alkalinity and chloride concentrations, all as ppm CaCO3.

b. Sulfate concentration will be 2/3 of the TDS, as ppm CaCO3.

c. Sulfate concentration can be calculated from the pH and alkalinity, as ppm CaCO3.

d. Sulfate concentration will be the difference between the TDS concentration and the chloride concentration, all as ppm CaCO3.

Clear selection

9. In incomplete water analyses, the calculated sodium concentration may actually be due to a combination of sodium and potassium and the chloride concentration may be a combination of chlorides and nitrates. Why might the nitrate concentration need to be measured separately from the chlorides, while the potassium concentration does not need to be separated from the sodium?

1 point

a. In potable water applications, nitrates are a potential health hazard and require individual monitoring to insure consumer safety.

b. The ratio of potassium to sodium concentrations is extremely small, while the ratio of nitrate to chloride concentration can be significantly larger.

c. Sodium and potassium take up the same amount of space on cation resin, while nitrates require significantly more space than chlorides.

d. Nitrates compete more strongly with chlorides for anion resin sites, causing chloride breakthrough, than potassium competes with sodium for cation resin sites.

Clear selection

10. Why does the silica contribute to the anion load but its counter ion does not contribute to the cation load?

1 point

a. Silica’s counter ion is hydrogen, which is not removed by cation exchange.

b. Anion exchange resins are more sensitive to weekly ionized substances than cation resins.

c. Silica could foul anion resin and needs to be carefully monitored.

d. In water, cations and anions are not always in balance.

Clear selection

11. At a pH of 6.5, what would be the CO2 concentration as ppm CaCO3, if the alkalinity is reported as 125 ppm CaCO3?

1 point

a. 35

b. 44

c. 60

d. 75

Clear selection

Submit

Clear form

Never submit passwords through Google Forms.

This content is neither created nor endorsed by Google. Report Abuse - Terms of Service - Privacy Policy

Forms