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Aluminum Sulfate Test

10% sample blending liquid and its aluminium salt (IT-2) and sulfates (IT-29) the experiment shall be positive. Solubility easily soluble in water, insoluble in ethanol. OT-42 method. 5% pH value of aqueous 2.9 or above, with a glass electrode.

Content analysis: weigh accurately the sample 4g, put 250ml volumetric flask, dissolved and later mixed with water. 10ml draw the solution into 250ml beaker, add 0.05mol/L of disodium EDTA (ethylene diamine tetraacetic acid disodium salt) solution 25.0ml and buffer pH 4.5 (77.1g 57ml acetic acid and ammonium acetate and water volume to 1000ml) 20ml, gently boiling 5min. After cooling, add alcohol. 50ml and dithizone solution (TS-94) 2ml. Titration with 0.05mol/L zinc sulfate solution to bright pink red, while a blank titration. 0.05mol/L per ml of disodium EDTA (ethylene diamine tetraacetic acid disodium) is equivalent to aluminum sulphate Al2 (SO4) 3 8.554mg or sulfate-containing 16.66mg.

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