Reference Materials

Volatile Organic Compounds Mix.

Water quality copper,lead,zinc,cadmium,nickel and chromium mixed standard samples.

Water quality hexavalent chromium standard sample 0.

Fluorine(Diluted 25-fold) 2.0-3.0 mg/L Chlorine(Diluted 25-fold) 3.0-3.5 mg/L Sulfate(Diluted 25-fold) 12.5-13.5 mg/L.

Water quality mixed standard of fluorine, chlorine, sulfate and nitrate.

Water quality mixed standard of fluorine, chlorine, sulfate and nitrate.

Water quality monitoring standard sample conductivity water quality standard sample.

Water quality monitoring standard sample conductivity water quality standard sample.

Water quality monitoring standard sample conductivity water quality standard sample.

Water quality permanganate index standard.

Water quality potassium, sodium, calcium and magnesium mixed standards.

Water quality sulfate standard.