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physics:
Wassertemperatur
chemistry:
NH4+
dissolved silica
Potassium is a chemical element with symbol K (from Neo-Latin kalium) and atomic number 19. It was first isolated from potash, the ashes of plants, from which its name derives. In the periodic table, potassium is one of the alkali metals. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. Potassium in nature occurs only in ionic salts. Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and reacts vigorously with water, generating sufficient heat to ignite hydrogen emitted in the reaction and burning with a lilac-colored flame. It is found dissolved in sea water (which is 0.04% potassium by weight[5][6]), and is part of many minerals.
(Wikipedia)
IGB Methodendatenbank:
http://intranet.igb-berlin.de/methodendetails/items/75.html
The sulfate or sulphate (see spelling differences) ion is a polyatomic anion with the empirical formula SO2−
4. Sulfate is the spelling recommended by IUPAC, but sulphate is used in British English. Salts, acid derivatives, and peroxides of sulfate are widely used in industry. Sulfates occur widely in everyday life. Sulfates are salts of sulfuric acid and many are prepared from that acid. (Wikipedia)
Total Sulfur (TS) stands for the sum parameter of all organic and inorganic sulfur compounds.
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