This document discusses dissolved oxygen (DO) levels in drinking water and their importance for aquatic life. It provides a table comparing drinking water quality standards in different countries that includes testing for microbiological, chemical, physical, and radiological parameters. The document discusses the sources and importance of DO, how aquatic organisms rely on it, and consequences of unusual DO levels. It also outlines several common methods for analyzing DO levels, including optical, electrochemical, colorimetric, and titrimetric methods.

1. PRESENTED BY: LEANDRO MICHAEL C. DE LOS SANTOS, JR.

2. Philippines (PNSDW
2007)
Thailand Cambodia (MIME,
MRD, PPWSA)
Singapore
(EPH)
Microbiological Quality √ √ √ √
Total Coliform, Fecal
Coliform and
Heterotrophic Plate Count E. coli
Chemical & Physical
Quality √ √ √ √
Color, Hardness,Taste,
Acidity, Alkalinity, Nitrate,
pH, Phenols,Turbidity,
pesticides, Flouride, etc. excluding DO excluding DO excluding DO excluding DO
Radiological Quality √ √ √ √
Gross alpha activity, Gross
beta, Radon toxic elements Radon 222
Comparative DrinkingWater Quality Standard

3. Comparative Acceptable D.O Level in Freshwater &
Marine

4. What is dissolved oxygen?
- refers to the level of free, non-compound
oxygen present in water or other liquids. It is
an important parameter in assessing water
quality because of its influence on the
organisms living within a body of water

5. Importance of dissolved oxygen in
aquatic life
- dissolved oxygen is necessary to many
aquatic animals as they use oxygen in
respiration
- microbes and fungi also require DO to
decompose organic material at the bottom of
a body of water

6. Where does DO come from?
Through air
Plant byproduct

7. Aquatic organisms & their DO
requirements

8. Consequences of unusual DO levels
Fishkill orWinterkill Gas Bubble Disease

9. Uses of dissolved oxygen analysis:
• Determine the health or cleanliness of a lake or
stream
• Determine the amount and type of biomass a
freshwater system can support
• Determine the amount of decomposition occurring in
the lake or stream

10. Different Methods ofAnalysis

11. Different Methods ofAnalysis
Optical Sensor Method
Optical DO Sensor

12. Different Methods ofAnalysis
Electrochemical DO Sensor or Amperometric or Clark-type Sensors

13. Different Methods ofAnalysis
Colorimetric Method
Indigo Carmine Rhodazine D

14. Different Methods ofAnalysis
Titrimetric Method
WinklerTitration

15. Works Cited