Technical notes

Practical guidance from our laboratory team on choosing grades, running methods and handling aggressive chemistry safely.

A specification limit and a measured value are different claims. Know which one you are looking at.

Hydrofluoric acid: what every new analyst must be told

HF burns can be painless for hours while fluoride moves toward bone. Preparation matters more than reaction time.

A practical rule: coulometric below about 1% water, volumetric above it. Here is why, and what goes wrong at the boundary.

ACS, TraceGrade, 1 ppb, 100 ppt, 10 ppt - the ladder is about the blank you can tolerate, not about the assay on the label.