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APHA
SMWW 3500-Mo
Molybdenum
2023
1
Standard methods for the examination of water and wastewater (543.3 APHA 24th ed. Ref. Treatises&monographs FL2)
Molybdenum (Mo) is the second element in Group VIB in the periodic table. It has an atomic number of 42, and atomic weight of 95.95, and valences of 2, 3, 4, 5, and 6. The average abundance of Mo in the earth’s crust is 1.2 ppm; in soils it is 2.5 ppm; in streams it is 1 μg/L, and in groundwaters it is <0.1 mg/L. Molybdenum occurs naturally as molybdenite (MoS2) and wulfenite (PbMoO4). It is used in alloys, ink pigments, catalysts, and lubricants...