Commonly used for the following methods:

Chromium 3500 - Cr B - Colorimetric Method

Nitrogen, Nitrate 4500 - N03 - F - Automated Cadmium Reduction Method

Test Specification

Appearance: clear, colorless solution

Assay (as NH3): 28.0 - 30.0%

Residue after ignition: <= 0.002%

Carbon dioxide: <= 0.002%

Chloride: <= 0.5 ppm

Nitrate: <= 2 ppm

Phosphate: <= 2 ppm

Sulfate:<= 2 ppm

Heavy metals: <= 0.5 ppm

Iron: <= 0.2 ppm

Substances reducing permanganate: Pass test