| http://www.w3.org/ns/prov#value | - Inorganic salts such as chlorides (KCl, NaCl), phosphates, sulfates or carbonates are preferably used and there may also be added, if necessary, salts of trace metals such as iron, copper, magnesium, zinc, cobalt or manganese and defoamers such as liquid paraffin, soybean oil, fat or silicone.
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