Hi Avik,

This is what you need, a nomagrams

http://www.waterontheweb.org/under/waterquality/art/nomogram.gif

Just draw a line, for example water temperature at 25 degree celcius, dissolved oxygen at 3ppm, then the DO saturation (%) would be estimated at about ~32%.

You can also visit http://www.waterontheweb.org/under/waterquality/oxygen.html for more details.

Hi Avik,

Increasing salinity will affect the solubility of oxygen in water. The effect in freshwater is usually minimal, but in brackish or saline water you need to correct for the salinity. Many DO meters have a built-in function to do this - refer to the manual for instructions for your particular meter. You have to measure the salinity, and enter it into the meter.

Otherwise, there are tables available. I Googled and found the following site, which seems to be fairly comprehensive. Table 6.2-7 gives salinity corrections:

http://water.usgs.gov/owq/FieldManual/Chapter6/6.2_v2.1.pdf

Cheers,

Anne

If it is possible for u please read a manual of sea water analysis

There still seems to be some interest in this topic, so I thought I would update the link I gave above, which no longer works.

The USGS website that I found very useful is now found at

https://water.usgs.gov/owq/FieldManual/Chapter6/6.2_contents.html

Cheers,

Anne

https://water.usgs.gov/software/DOTABLES/

How can I calculate the oxygen saturation values, if I have dissolved oxygen value with me? and Can I calculate secchi disk depth(SDD) from turbidity values?

Thank you in advance and please response me as I am unable to find it.

A formula is much better if you have a spreadsheet and thousands of data points, as we do.

You can consult this site:

Percent Saturation of Dissolved Oxygen 1 Determine water ...

https://dep.wv.gov › sos › SOSKit › DOSaturation

PDF