Does ozone gas have a color? Yes, the color is blue. The problem is, ozone is normally found in gas, or in water at such low concentrations that the color is not visible.
Recently we performed some lab testing that required ozone levels in water greater than 100 ppm. The picture below provide some great examples of the color of ozone.
The table below provides additional information on the properties of ozone. This shows the color of ozone is light blue, which is true. It is only visibly blue when ozone gas or ozone in water is at a very high concentration.
|Molecular Weight||48 g/mol||32 g/mol|
|Smell||Odor threshold of 0.001 ppm, pungent at high levels||Odorless|
|Melting Point||-192.5 deg C||-218.79 deg C|
|Boiling point||-111.9 deg C||-1892.95 deg C|
|Critical Temperature||-121 deg C||-118.56 deg C|
|Critical Pressure||54.5 atm||5.043 atm|
|Density||2.144 g/l @ 0 deg C||1.429 g/l @ 0 deg C|
|Solubility @ 0 deg C||0.64 g/100 ml||0.049 g/100 ml|
|Electrochemical Potential||2.07 V||1.23 V|
Ozone is only partially soluble into water. The graph below shows the solubility of ozone into water based on water temperature and ozone gas concentration. As the water temperature decreases and ozone concentration increases ozone becomes more soluble into water.
Water pressure is the third and final factor in determining ozone solubility into water. However, as these images were taken of water at ambient pressure, this was not a factor used, and is not a required factor in achieving high ozone levels into water.
Do you have a need to achieve higher ozone levels into water? Or lab testing that requires dissolved ozone levels higher than off-the-shelf equipment can provide? Give us a call, we would be glad to help.