Polyaluminum chloride detection method: add acid in the sample depolymerization of the sample. Add an excess of ethylenediamine tetraethyl disodium solution with aluminum and other metal from the complexation. Titrate with zinc chloride standard titration solution remaining disodium ethylenediaminetetraacetate. Then the potassium fluoride solution is used to analyze the complexed aluminum ions and the disodium ethylenediaminetetraacetate is titrated with a zinc chloride standard titration solution. Poly aluminum chloride (Polyaluminium Chloude) referred to as PAC, high-quality aluminum hydroxide powder as the main raw material through a series of processing technology for the inorganic polymer. It is a water-soluble inorganic polymer between AlCl3 and Al (OH) 3, the technical indicator of polyaluminum chloride, the chemical formula is (AL2 (OH) Ncl6-nLm), the color is yellow and shallow Yellow powder granular solid. This product is non-toxic, tasteless, non-corrosive, with deodorant decolorization, in addition to turbidity, sterilization and other effects. In air deliquescence, but does not affect the use of effect, efficient polyaluminum chloride after pouring high decomposition activity, rapid settling, without any additives, water temperature and water quality. Usage: The product can be used for sterilization, deodorization, fluoride removal, aluminum, chromium, oil removal, turbidity removal, addition to heavy metal salts and radioactive pollutants. It has a wide range of uses in purifying various water sources. 1, urban water purification: purification of drinking water, domestic sewage. 2, industrial water purification: printing and dyeing wastewater, leather waste water, fluorine-containing wastewater, heavy metal wastewater, oily wastewater, coal washing wastewater, mining wastewater, brewing wastewater, metallurgical wastewater, meat processing wastewater. 3, industrial production applications: paper sizing, dyeing and printing and dyeing, quick-setting cement, precision casting hardening agent, refractory adhesives, glycerin refined, anti-wrinkle cloth, medicine, cosmetics and other industries, the wastewater can be recycled.