Sources of molybdenum pollution

   There are two main sources of molybdenum in natural environment. One is that weathering releases it from rocks. It is estimated that about 1000 tons enter water and soil every year and migrate in the environment. The other is that molybdenum-containing fossil fuels (such as coal) are more and more widely used in human activities, thus increasing the cycle of it in the environment. Loop quantity. The cycle of human activity has exceeded the natural circulation.

   Effect of soil on Soil

   The uneven distribution of molybdenum in soils in various regions has resulted in gout in some areas due to the high content. For example, the daily molybdenum intake of Armenian residents is as high as 10-15 mg. The incidence of gout is high in the region. In some areas, water and soil diseases are caused by the lack of molybdenum, such as the high incidence of esophageal cancer in Linxian County, Henan Province, China. The investigation shows that the content of molybdenum in local grain, residents'serum and soil is very low. The lack of it in soil leads to the accumulation of nitrate and nitrite carcinogens in crops. Therefore, the residents here are prone to esophageal cancer. After using ammonium molybdate fertilizer, the content in grain and vegetables increased significantly. The incidence of cancer was significantly reduced.

  The higher the oxidizability of water and soil, the greater the alkalinity, the more easily molybdenum forms MoO_ 3 ions, and plants can absorb this state . With the increase of acidity or reducibility of the environment, molybdenum is easily converted into complex ions, and finally forms MoO_, which is easily immobilized by clay, soil colloids and humic acid and is inactive, and can not be absorbed by plants.

   Influence of ocean

   In the ocean, molybdenum is adsorbed by organic substances and encapsulated in manganese-containing colloids in the deep-sea reduction environment, resulting in nodules sinking to the sea floor and breaking away from the cycle of biosphere.

   Influence of animals and plants

  Although molybdenum has little effect on warm-blooded animals and fish, high content can cause deformities in some animals and have adverse effects on plants. The effects of its on plants showed that the growth of flax would be affected to varying degrees when its concentration was 0.5-100 mg/l, and that of soybean would be harmed when molybdenum concentration was 10-20 mg/l. Experiments on the effects on aquatic organisms show that when its concentration reaches 5 mg/L, the biological self-purification of water body will be inhibited; when concentration reaches 10 mg/L, this effect will be more inhibited, and water has strong astringency; when concentration reaches 100 mg/L, the growth of microorganisms in water body slows down and water has bitter taste. In addition, the reduction of molybdenum content will also have adverse effects on the growth of plants and animals. For example, kiwifruit leaf macular disease is caused by the lack of molybdenum, which leads to the absorption of nitrogen in soil can not be directly used to synthesize chlorophyll.

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