Excretion of Molybdenum in Animals
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- Category: Molybdenum knowledge
- Published on 10 September 2013
- Written by 陈桂兰
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With animals the concentration of molybdenum in the urine and faeces rises rapidly after administration of molybdenum trioxide and molybdates. Molybdenum is excreted mainly in the urine probably as the molybdate anion. With human subjects injected intravenously with a single tracer dose of 99Mo, after five days 16.6-27.2% of the99Mo had been excreted in the urine and only 1-6.8% in the faeces [Rosoff and Spencer, 1964]. It has been estimated that the average excretion of molybdenum by humans is about 50-70 microg per day [Friberg and Lener, 1986]. The amount of molybdenum excreted and the route are affected by sulfate (added to, or as part of, the diet). For cattle, sheep and rats the total amount of molybdenum excreted and the proportion in the urine increases with increasing sulfate in the diet . A study using radiomolybdenum to trace the excretion process in cattle found that the biological half-life of molybdenum was 19.9 ± 1.4 h.
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