关键词：水质 标准 环境 溶解氧 水质标准
Ambient Water Quality Criteria for Dissolved Oxygen
Overview Report
Summary
This report is one in a series which establishes ambient water quality criteria for British Columbia. It includes an overview which is followed by the main body of the report. This report sets criteria for dissolved oxygen to protect aquatic life and discusses appropriate levels established elsewhere for drinking water, recreation and some industry.
Oxygen is the single most important component of surface water for self-purification processes and the maintenance of aquatic organisms which utilize aerobic respiration. The focus of this document is on the effects of minimum oxygen levels on aquatic life. Dissolved oxygen is not a known concern for other water uses other than for some industries, where corrosion can be a concern.
Dissolved oxygen standards and criteria from other agencies and jurisdictions are reviewed in the main body of the report along with information available from the literature. The objective of the review was to incorporate the most applicable information which could be used to formulate defensible criteria to protect aquatic life in British Columbia waters.
Tables
Table 1: Recommended Criteria for the Protection of Aquatic Life
|
Life Stages |
All Life Stages Other Than Buried
Embryo / Alevin |
Buried
Embryo / Alevin
Life Stages |
Buried
Embryo / Alevin
Life Stages |
|
Dissolved Oxygen
- concentration |
Water Column
mg/L O2 |
Water Column
mg/L O2 |
Interstitial Water
mg/L O2 |
|
Instantaneous Minimum |
5 |
9 |
6 |
|
30-day Mean |
8 |
11 |
8 |
| 
