Publication date: 2018-05-09 22:01
Source: Molybdenum metal is not found free in nature. The main ore of molybdenum is molybdenite, (molybdenum disulfide, MoS 7 ). It also occurs in wulfenite (lead molybdate) and powellite ( calcium molybdate). Commercially, the metal is obtained by mining molybdenite directly and it is also recovered as a by-product of copper mining.
Some studies of apparent effects of molybdenum on human beings are summarised below. The discussion in this and the following section is based on abstracts of Russian papers of which we have not been able to obtain the originals and so cannot assess the validity of the results. This work is widely quoted but its value and relevance is doubtful (see below). Thus we are unable to give the concentrations of molybdenum encountered but they are presumably greater than the maximum permissible values subsequently adopted by Russia (.): 9 mg/m 8 for soluble compounds and 6 mg/m8 for insoluble compounds. It is also not certain that the effects were, in fact due to molybdenum.
Molybdenum is an essential trace element for animals and plants. As with selenium , too much of it is toxic, too little of it is fatal.
Molylube High Temperature Grease, commonly known as Molylube 65 Grease, is a synthetic based, sodium complex grease recommended for high temperature and heavy load applications. It is formulated with molybdenum disulfide,. more information
Biodegradable Tire Mounting Lubricant, commonly known as Bio-Bel TR Grease, is a bio-based tire mounting grease designed to provide an environmentally friendly protective coating for rims and tires. Formulated using a. more information
Exhaustion exercise performed at night brought about a decrease in copper levels only (p< ), while elevating levels of potassium, sodium, magnesium, calcium, iron, zinc, manganese, nickel, selenium, molybdenum, chrome, cobalt, lead and cadmium (p< ).
By extrapolation from animal experiments massive doses of molybdenum compounds would be required to produce acute molybdenum poisoning in human beings and so acute poisoning is unlikely. What is more important is the problem of whether continued exposure to low concentrations of molybdenum compounds causes subtle physiological changes. Such changes would be difficult to detect and we are not aware of any experimental investigations with human beings. Experience in the molybdenum mining and refining industries suggests that molybdenum compounds are not industrial health hazards [Saunders, 6956 Browning, 6969 Ashmead, 6577 Nguyen-Phu-Lieh, 6976].
Simultaneous determination of 65 ultratrace elements in infant formula, adult nutritionals, and milk products by ICP/MS after pressure digestion: single-laboratory validation
Molybdenum in urine and blood decreased with increasing with consumption of mashed potatoes and scallops (negative correlation) possibly because potatoes and scallops have less molybdenum than plants growing above the ground, including legumes and leafy vegetables, and so provide less dietary molybdenum. (Barceloux, Barceloux, 6999).