Trace elements

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Term (also microelement) for chemical elements that only occur in low concentrations (traces). Extremely low concentrations are also referred to as ultra-trace elements. In geochemistry, material components and accompanying elements of rocks and minerals in concentrations below 0.1% or 1000 ppm (millionths) are referred to as trace elements. In analytical chemistry, the threshold value is 100 ppm or 100 µg/g (= 100 mg/kg) or 0.01 %. In biology, essential trace elements are chemical elements that are essential for organisms and occur in the organism in proportions of less than 50 mg/kg.

Spurenelemente - 5

Trace elements: Picture 1 = boron, picture 2 = iron, picture 3 = copper, image 4 = manganese, 5 = molybdenum

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Trace elements

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Trace elements

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