Is SroH2 water-soluble

The strontium concentration in seawater averages around 8 ppm. River water generally contains around 50 ppb. 10 ppm (based on dry matter) were found in oyster tissue.
In the dissolved state, strontium is mainly as Sr2+(aq) present. Another possible form is SrOH+(aq).

How and in which compounds does strontium react with water?

Strontium slowly reacts with water to form strontium hydroxide and hydrogen gas. It reacts faster than calcium, which is just above it on the periodic table, and slower than barium, which is below it on the periodic table. The reaction equation is as follows:

Sr (s) + 2H2O (g) → Sr (OH)2(aq) + H2(G)

Water solubility of strontium and / or its compounds

Strontium is not soluble in water, but reacts with it. Strontium compounds, however, can very well be water-soluble. Examples are strontium carbonate with a water solubility of 10 mg / L and strontium chromate with 9 mg / L.

Solubility and how it can be influenced

How can strontium get into water?

The most important mineral containing strontium is Celestine (strontium sulfate) followed by strontianite (strontium carbonate). Around 140,000 tons of this are mined every year. The metal made from it is not in great demand, but is used to remove the last remaining air from vacuum tubes. As a carbonate, it is mainly used in the manufacture of television screens. This is also the main use of strontium. It intercepts the X-rays generated by the electrical radiation in the cathode ray tube. However, with the increasing use of flat screens, it is required less and less for this purpose. Strontium is also used to refine alloys and was used in the form of strontium titanate as an imitation diamond. It burns with a red flame and is therefore well suited for fireworks and warning lights. Strontium ferrite is used in permanent ceramic magnets, which are used in small motors, for example, because of their high coercive force and resistance to high temperatures and corrosion.
Radioactive 89Sr is used in nuclear physics research and nuclear medicine. 90On the other hand, Sr is a by-product of nuclear explosions. It led to severe contamination of the earth in the 50s and 60s of the 20th century, as above-ground test explosions were carried out. It is also a by-product of nuclear reactors, the high-energy radiation of which is used in spacecraft and remote weather stations.

What environmental problems can water pollution with strontium cause?

Strontium is only an essential element for organisms in individual cases. Some deep-sea organisms build it into their housing as strontium sulfate and hard corals need it as well. Plants contain around 3-400 ppm of this substance (based on dry matter). Due to precipitation to strontium carbonate or storage in shell material, strontium is mostly immobile in the environment. The highest concentrations were found in deserts and forest floors.
Strontium naturally has four stable isotopes. There are also nineteen unstable isotopes. 90Sr spread as a by-product of nuclear explosions for test purposes in the middle of the last century on earth, was washed out of the atmosphere, got through the ground into grazing cows and other animals and finally also humans. It was actually ingested in measurable quantities by all terrestrial organisms. It is difficult to say the extent of the carcinogenic and mutagenic effects.

What health effects can strontium cause in water?

Strontium is about 4.6 ppm in the human body. It has no function here, but is primarily absorbed because of its similarity to calcium. Therefore, most of the ingested strontium is also incorporated into the skeleton.
Strontium is considered non-toxic and a daily intake of usually 0.8-5 mg with food is considered harmless if it is not radioactive strontium (90Sr) acts. As described above, this found its way into food and, above all, drinking water in the previous century. It was later found mainly in the milk teeth of children.
The risks of ingestion of radioactive strontium are its likely carcinogenic and mutagenic effects, causing problems with cell division and the possible increase in infant mortality. 90Sr breaks down into radioactive yttrium, which accumulates mainly in the pituitary gland and the ovaries and can thus disrupt the hormonal balance and the growth of children.

What water purification technologies can be used to remove strontium?

References


To the periodic table of the elements

To the overview of the elements and water