Du kan da bare tilsætte det til vandet men det er der jo ik behov efter som det er i fodret, jeg tror ik mine evner rækker til at forklare det så i kan forstå, men jeg fandt dette som forklare lidt om jod, der går lidt ud på at jod kan bindes i forskellige mineraler
alger koraller og andre dyr men i vand vil det forsvinde/fordampe.
Copy paste fra internet.
Iodine (I) and water
Iodine and water: reaction mechanisms, environmental impact and health effects
Iodine is naturally present in water. The average concentration in seawater is about 60 ppb, but varies from place to place. Rivers usually contain about 5 ppb of iodine, and in mineral sources some ppm can even be found. Brown algae accumulate up to 0.45% (dry mass) of iodine. Corals, sea sponges, shells and fishes accumulate high iodine concentrations, usually in the shape of thyroxin or tri-iodine thyroxin.
In what way and in what form does iodine react with water?
Iodine is strongly reactive, even though it is less extreme for iodine than for other halogens. Iodine cannot be found as an element, but rather as I2 molecules, as I- ions, or as iodate (a salt of iodinic acid with IO3- anion).
When iodine is added to water, the following reaction results:
I2(l) + H2O(l) -> OI-(aq) + 2H+(aq) + I-(aq)
I2 molecules and water molecules react to substances such as hypoiodite (OI-). The reaction can move both ways of the equilibrium, depending on the pH of the solution.
Iodine may also occur as I3-(aq), HIO(aq), IO-(aq) en HIO3(aq). Iodine can bind to many different substances, for example other halogens. The compounds that are form behave differently when they come in contact with water.
Solubility of iodine and iodine compounds
Water solubility of iodine is determined by temperature (20oC) and pressure (1 bar), and is relatively low. Iodine is better soluble in iodine solutions. The following reaction mechanism occurs:
I2 + I- -> [I3]-
When iodine ends up in surface waters, it may escape as iodine gas. Most iodine compounds are readily soluble in water or alcohol. Inorganic iodines are highly water soluble.
Read more:
http://www.lenntech.com/periodic/water/ ... z45cB0UzhM" onclick="window.open(this.href);return false;