... Qualified Qualified 6 Heavy metals, as Pb %≤ 0.001 7 Arsenic, as As%≤ 0.0003 8 Fluoride as F%≤ 0.003 9 Water ... insoluble %≤ 0.05 0.06 Application:For industrial use, such as oil field, paper-making, textile, dyeing, petrochemical industry, tanning ... analytical chemistry reagent. For food grade, it is mainly used as additive agent, PH adjusting agent and fermentation agent, and nourishment. Packaging ...