How To Use Hydrofluoric Acid and Its Alternatives for Acid Digestion with Multiwave Instruments
Hydrofluoric acid or alternative fluorinated reagents are used in microwave-assisted acid digestion of matrices such as silicates, mixed silicates, and metal oxides of Nb, Ta, Ti, and Zr using Multiwave instruments.
Hydrofluoric acid (HF) is the classical and most widely used reagent to provide the fluoride required to digest natural and industrial silicates, and oxides of metals like Nb, Ta, Ti, and Zr with high-temperature microwave assisted acid digestion in closed PTFE vessels. This makes not only the metals attached to the crystal surface (leaching) but also the metals built into the crystal lattice (complete digestion) available in solution.
Warning: Due to the toxicity of hydrofluoric acid, it must only be used by specially trained personnel, equipped with the legally required personal safety equipment. Refer to the local safety regulations for use and disposal of hydrofluoric acid.
Hydrofluoric acid (HF) is toxic, dangerous, and with growing safety restrictions for dangerous chemicals in many countries, banned in a growing number of laboratories. This report also describes the use of alternatives like ammonium fluoride (NH4F) and fluoroboric acid (HBF4). Finally, boric acid complexation to protect sensitive ICP sample introduction glassware is also described.
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