... .0050.005Drying loss,%11.0-13.011.0-13.0pH-value (5% transparent solution)--7.5-9As, ≤ppm--1Lead, ≤ppm--1Hg ... crystalline powder, odorless, soluble in water, insoluble in ethanol, pH-value of 5% aqueous solution: 7.6—8.6 Quality standard(can ...