Iodine often ends up in surface water from waste water treatment plants, including radioactive isotopes. Iodine is retained by sludge for 2-25%. The residue remains in water, causing effluents to contain between 1 and 16 μg/L. High iodine concentrations may be present near chemical waste dumps.
When we go outside in the morning to check on plants, the first thing we see are drops of water on its leaves despite not raining the night before. These are morning dews that come from water vapours. Morning dews are known to be cool and according to research they contain plenty of oxygen, as much as 14-16ppm.