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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.In analytical chemistry, a trace element is an element in a sample that has an average concentration of less than 100 parts per million measured in atomic count, or less than 100 micrograms per gram. In biochemistry, a trace element is a chemical element that is needed in minute quantities for the proper growth, development, and physiology of the organism. In biochemistry, a trace element is also referred to as a micronutrient. In geochemistry, a trace element is a chemical element whose concentration is less than 1000 ppm or 0.1% of a rock''s composition. The term is used mainly in igneous petrology.