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Complexing agent. Masking agent. Precipitant. Reducing agent. Analysis to test and determination of beryllium, calcium, chromium, gold, manganese, strontium, thorium and other metal ions. Analysis of microscopic examination microcrystalline sodium and other elements. Precipitation of calcium, magnesium, thorium and rare earth elements. Calibration solution of potassium permanganate and cerium sulfate standard solution. Bleach. Help agent.