描述
Cadmium, also known as cadmium, ion (cd2+) or cadmium ion, is a member of the class of compounds known as homogeneous transition metal compounds. Homogeneous transition metal compounds are inorganic compounds containing only metal atoms,with the largest atom being a transition metal atom. Cadmium can be found in a number of food items such as capers, horseradish, malabar spinach, and wax apple, which makes cadmium a potential biomarker for the consumption of these food products. Cadmium can be found primarily in blood, cerebrospinal fluid (CSF), saliva, and urine. Moreover, cadmium is found to be associated with alzheimer's disease, macular degeneration, multiple sclerosis, and parkinson's disease. Cadmium is formally rated as a carcinogenic (IARC 1) potentially toxic compound. Cadmium is a chemical element with symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it demonstrates oxidation state +2 in most of its compounds, and like mercury, it has a lower melting point than the transition metals in groups 3 through 11. Cadmium and its congeners in group 12 are often not considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states. The average concentration of cadmium in Earth's crust is between 0.1 and 0.5 parts per million (ppm). It was discovered in 1817 simultaneously by Stromeyer and Hermann, both in Germany, as an impurity in zinc carbonate . Acute inhalation of cadmium fumes results in metal fume fever, which is characterized by chills, fever, headache, weakness, dryness of the nose and throat, chest pain, and coughing. Ingestion of cadmium causes vomiting and diarrhea (L6) (T3DB).