Diatomaceous earth (DE) is generally safe to use on leaves and won't damage plants, jus wash it off.
Silica: DE is usually 80–90% silica.
The pH of diatomaceous earth (DE) can vary depending on its use and form:
Natural pH: DE has a natural pH of around 8.5.
Alkaline pH: DE can have an alkaline pH of 9.21.
Neutral pH: DE can be pH neutral and help maintain consistent pH levels.
10% slurry pH: DE can have a pH of 5.0–10.0 in a 10% slurry.
Wash your leaves and carry on. Fairly slow acting so you will need to keep tabs on your ph going forward.