Molybdenum

Location:  Group 6, Period 5
Atomic Weight:  95.94
Coordination Number:  6, 7, 8, 9
Chemical Form in Solution:  MoO₄^-2 (chem. form as received)
(coordination numbers in green are observed less frequently)

Storage & Handling:  Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.

Chemical Compatibility:  Mo is received in a NH₄OH matrix, giving the operator the option of using HCl or HF to stabilize acidic solutions. The MoO₄^-2 is soluble in concentrated HCl MoOCl₅^-2, dilute HF / HNO₃, MoOF₅^-2, and basic media MoO₄^-2. Stable at ppm levels with some metals, provided it is fluorinated. Do not mix with Alkaline or Rare Earths when HF is present. Stable with most inorganic anions, provided it is in the MoO₄^-2 chemical form.

Stability:  2-100 ppb levels stable (alone or mixed with all other metals that are at comparable levels) as the MoOF₅^-2 for months in 1% HNO₃ / LDPE container. 1-10,000 ppm single element solutions as the MoO₄^-2 chemically stable for years in 1% NH₄OH in a LDPE container.

Mo Containing Samples (Preparation & Solution):  Metal (soluble in HF / HNO₃ or hot dilute HCl); Oxide (soluble in HF or NH₄OH); Organic Matrices (dry ash at 450°C in Pt⁰ and dissolve oxide with HF or HCl).