Nickel is silvery-white metal with yellowish nuance and belongs to VIIIb Periodic table of the elements. Nickel often occurs with cobalt. Nickel is using in metal protection against corrosion, because it is very resistant on oxidation and in production of stainless steel and alloys. Also it is using in production of ceramics, special batteries, electronics and space program. In nature it does not occur in elementary conditions, it occurs as sulphides, arsenide, antimonides, oxides and silicates. Nickel salts are soluble in waters, as the most of nickel compounds.
Origin in water
In small concentration nickel presence in underground and surface waters, until in seawaters its concentration is very high. In specific cases concentration in water can be bigger, because of natural or industrial deposits in soil.
Nickel has low toxicities in compression with zinc, manganese and chrome and it does not accumulate in tissues.
It is noticed that inhaled nickel compounds are cancerous for people and metal nickel possible is cancerous. Still, evidences about cancerous risk at oral loading are missed. Potential effects of nickel on health are heart and liver damage.
Maximal allowable concentrations
According to recommendations of EU (Directive 98/83/EC) limitary value for nickel is 20 mg/l. The same value is in our rules for drinking water (Sl. list SRJ 42/98).