# What does percent saturation of dissolved oxygen mean?

## What does percent saturation of dissolved oxygen mean?

100% air saturation means that the water is holding as many dissolved gas molecules as it can in equilibrium. At equilibrium, the percentage of each gas in the water would be equivalent to the percentage of that gas in the atmosphere – i.e. its partial pressure ¹³.

## What do dissolved oxygen levels mean?

Dissolved oxygen (DO) is the amount of oxygen that is present in water. Water bodies receive oxygen from the atmosphere and from aquatic plants. Running water, such as that of a swift moving stream, dissolves more oxygen than the still water of a pond or lake.

What is oxygen saturation simple definition?

Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood. The human body requires and regulates a very precise and specific balance of oxygen in the blood. Normal arterial blood oxygen saturation levels in humans are 95–100 percent.

### What is the percentage of dissolved oxygen in water?

Healthy water should generally have dissolved oxygen concentrations above 6.5-8 mg/L and between about 80-120 %.

### What does it mean when dissolved oxygen is at 100%?

In a stable body of water with no stratification, dissolved oxygen will remain at 100% air saturation. 100% air saturation means that the water is holding as many dissolved gas molecules at it can in equilibrium.

What should the percent saturation of oxygen be?

Draw a straight line from oxygen in mg/L mark to the water temperature mark. Where the drawn straight line passes through the % saturation line is the converted Percent Saturation value. Percent Saturation values of 80 – 120% are considered to be excellent, and values less than 60% or over 125% are considered to be poor.

## What is the dissolved oxygen reading at night?

The following example may be useful in understanding this concept: The dissolved oxygen reading of a relatively stagnant lake at night is 9.65 mg/L when the temperature is 17°C. This corresponds to 100% air saturation. During the next day, the sun warms the water to 22°C where 8.22 mg/L represents the 100% air-saturated value.

## How to calculate the correction factor for dissolved oxygen?

Determine the altitude (elevation) or atmospheric pressure and use the table below to determine the correction factor. Multiply the Dissolved Oxygen level (in ppm) by the correction factor. *From the Field Manual for Water Quality Monitoring