Nickel nitrate is a nitrate of nickel. Nickel is a chemical compound with the atomic number 28. It is found abundantly in nature in laterite ore minerals, such as limonite, garnierite, and pentlandite. Nickel has a biological role and is found in certain enzymes, including urease, hydrogenase, methylcoenzyme M reductase, and carbon monoxide dehydrogenase. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137, L40, L41)
