Location: Group 6, Period 6
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: W is very readily hydrolyzed requiring 0.1 to 1% HF for stable acidic solutions. The [WOF5]-2 is soluble in % levels of HCl and HNO3, provided it is in the [WOF5]-2 form. Stable at ppm levels with some metals provided it is fluorinated. Do not mix with Alkaline or Rare Earths. W is best to be mixed only with other fluorinated metals (Ti, Zr, Hf, Nb, Ta, Mo, Si, Sn, Ge). Look for yellow WO3 precipitate if mixed with other transitions at higher levels indicating instability. The yellow WO3 will form over a period of weeks even in trace HF, therefore HF levels of W multi-element blends should be ~ 1%.
Stability: 2-100 ppb levels stable (alone or mixed with all other metals that are at comparable levels) as the [WOF5]-2 for months in 1% HNO3 / LDPE container. 1-10,000 ppm single element solutions as the [WOF5]-2 chemically stable for years in 1% HF in a LDPE container.
W Containing Samples (Preparation & Solution): Metal (soluble in HF / HNO3); Oxide (soluble in HF or NH4OH); Organic Matrices (dry ash at 450 0C in Pt0 and dissolve oxide with HF).
|Atomic Spectroscopic Information:|
1000ug/mL TUNGSTEN 500mL
0.2% v/v Nitric Acid / 2% v/v Hydrofluoric Acid
Associated Certifications: ISO 17025
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