Quantitative Trace Metals Analysis Using Hydrofluoric Acid Alternatives

Introduction

Researchers from CEM and DuPont have worked together to determine if it is possible to use a fluoride surrogate other than hydrofluoric acid (HF) in sample preparation. Total dissolution of a sample matrix is critical to ensure accurate data, and this study investigated two promising, commercially available HF alternatives. Our team used titanium dioxide with trace levels of aluminum and silicon as target analytes for this experiment. Ammonium bifluoride (NH₄HF₂ ) and fluoroboric acid (HBF₄ ) were chosen as fluoride sources and validated against digestions with HF. All samples were prepared with a MARS 6 microwave digestion unit and analyzed with a Perkin Elmer Optima 5300 ICP-OES.

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