Contamination Of Molybdenum
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- Category: Molybdenum knowledge
- Published on 13 August 2014
- Written by ling
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Molybdenum average abundance in the earth's crust is 1.3ppm, more than exist in molybdenite, galena and molybdenum, molybdenum ore in water. Fossil fuel also contains molybdenum. Very low concentrations of molybdenum in natural waters, the average concentration of molybdenum in seawater is 14 micrograms / liter. Mo in the air mainly in the presence of molybdate and molybdenum oxide state, a low concentration, usually less than the molybdenum compound 1 microgram / m 3.
Environment, there are two sources of molybdenum: ① weathering molybdenum released from the rock. An estimated 1,000 tons per year into the water and soil, and migrate in the environment. Uneven distribution of molybdenum, molybdenum shortage in some areas while causing a "water and soil disease"; has also caused some areas due to the high molybdenum appear "gout" (such as Soviet Armenia). ② human activities increasingly widespread application of molybdenum and molybdenum-containing combustion of fossil fuels (such as coal), thus increasing the amount of molybdenum in the environment of the cycle. The world's molybdenum production was 100,000 tons per year, burning into the environment annually 800 tons of molybdenum. Human activities added circulation exceeds the amount of the natural cycle. Molybdenum is the largest metallurgy, electronics, missiles and aerospace, nuclear, chemical and other industries as well as agriculture. Current research on contamination of molybdenum is still not enough.
Molybdenum oxide and reducing conditions in the environment migration with the environment, pH and the impact of other media-related. Oxidizing water and soil higher alkaline larger, the more easy to form MoO 厈 molybdenum ions; molybdenum plants can absorb such a state. The acidic environment of increasing or reducing elevated molybdenum easily into complex ions, forming MoO Xun; molybdenum susceptible to this condition and soil clay and humic colloids fixed and loss of activity can not be absorbed by plants. In the ocean, deep-sea reducing environment molybdenum was wrapped in the adsorption of organic substances colloidal manganese, and ultimately the formation of tuberculosis sink to the bottom, from the biosphere cycle.
Molybdenum has little effect on warm-blooded animals and fish. High levels of molybdenum have adverse effects on plants, tests showed: such as molybdenum concentration of 0.5 to 100 mg / grown produce different degrees of impact on the linen when liter; 10 to 20 mg / liter of soybean growth when there is harm; 25 to 35 mg / cotton Growth mild harm to rise; growth of sugar beet harm when 40 mg / liter. Molybdenum concentrations in water up to 5 mg / l, the biological self-purification of water bodies will be inhibited; 10 mg / l, this effect being more inhibited, water has a strong astringency; 100 mg / l, water microbial growth minus slowly, the water has a bitter taste.
China provides the maximum allowable concentration of molybdenum in surface water is 0.5 mg / l, air workshop soluble molybdenum maximum allowable concentration of 4 mg / m 3, insoluble molybdenum 6 mg / m 3.
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