Acidity: take this product 1.0g, add boiling over dissolved in 20ml warm water, let cool, add 2 drops of phenolphthalein indicator solution and sodium hydroxide solution (0.1mol / L) 0.50ml, should be significantly pink.
Chloride: Ethyl lactate product 0.10g, according to inspection, made with standard sodium chloride solution 5.0ml control solution may not be thicker (0.050%).
Sulfate: Take this product 0.40g, according to inspection, made with standard potassium sulfate solution 3.0ml control solution may not be thicker (0.075%).
Barium salt: Take 1.0g, 20ml water to dissolve, is divided into two equal parts, one as a control tube, another plus calcium sulfate solution 1ml, for 15 minutes, compared with the control tube, not thicker.
Molysite: Take this product 0.50g, add water 25ml, dissolved by heating in a water bath, zinc lactate, according to inspection, with the standard iron solution 2.5ml were made using the same method was compared to no deeper (0.005%).
Heavy Metal: Take this product 1.0g, add water 15ml with acetate buffer (pH3.5) 2ml micro heat dissolved, let cool, add water to make into a 25ml, according to inspection, containing heavy metals should not exceed ten millionths.
Arsenic: take this product 1.0g, 5ml hydrochloric acid dissolved in 23ml of water, according to inspection, should meet the requirements (0.0002%).
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