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Quality -> Chemical composition -> Micro components -> Chrome



General characteristics

Chrome is shiny metal, grey-white colour, which belongs to VIb group of Periodic table of the elements. Chrome is wide prevalent metal in Earth crust. It is using for chroming, in steel alloy, in alloy with nickel, copper, manganese and other metals, like horizontal inhibitor in textile, photographic and glass industry. Chroming, metallurgy of chrome and chemical processes can contaminate atmospheric with chrome, with combustion of fossil fuels, burning hard waste and cementer emission. Industrial pollution can be from industry of paints, explosives, ceramics, papers and leathers.  The most important compounds are potassium and sodium chromates, dichromate, potassium and ammonium chromic alum and lead-chromate. Cr3+ is stable except in chlorine water, until Cr6+ quickly reduces with organic substances. Chlorides, nitrates and sulphates are soluble in water; hydroxides and carbonates are indissoluble; and sodium, potassium and ammonium-chromates are soluble in regard on dichromates which are completely indissoluble (De Znane, 1997)

Origin in water


Chrome is naturaly in drinking water, because it present in Earth crust with content about 10-200 ppm

Medical aspe

Positive effect

Chrome helps growth. It is effective in prevention and in wane of blood pressure. Chrome helps in prevention sugar wish and suddenly decrement of energy level.  Cr3+ is essential with daily dose of 0,2 mg.

Negative effect

Experimental investigations on animals show that Cr6+ is cancerous, if in organism enter with inhalation.  In epidemic studies, scientists find connection Cr6+ inhalation and lung cancer. Compounds of Cr6+ are active in wide level in vitro and in vivo of genotoxic tests, until Cr3+ are not active. Cr6+ has malign effect on liver, kidneys and respiratory organs with bleeding, dermatitis and skin injury during chronic and sub chronic exposed. 

Maximal allowable concentrations

According to recommendations of EU (Directive 98/83/EC) and according to our rules for drinking water (Sl. list SRJ 42/98), limitary value for total chrome is  
mg/l.


 






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