Enrichment Of Trace Zinc In The Cadmium Matrix Separation

The authors carried many researches of the feasibility about enriching and separating trace zinc from almost cadmium, and the rate of recoveries of several common metal ions according to this methodo Through repeatedly probed and tried out, at last, a thought as collaborated with traditional methods was established - using diantipyrinylmethane as complex reagent ,with ammonium thiocyanate and zinc forming the triple ionic compound in the medium of hydrochloric acid , extracted by trichloromethane, extracted the organic system by ammonium hydroxide in order to gain zinc . The recovery of zinc surpasses 95%, the relative deviation is smaller than 0.5%. Specifying finished work has the following some:1 ) Looked up many documentary datum about enriching and separatingtrace zinc, and put forward the method and procedure of carrying theseexperiments and researches .2) According to the relative resemblance about zinc and cadmium of qualities, the author put forward, since chlorine ion can combine cadmium ion strongly, adding amount of chlorine ion to restrain the extraction of cadmium, which enhanced the extraction efficiency of trace zinc at last.3) Doing many experiments of optimum conditions about enriching and separating and determining trace zinc using spectrophotometry.4) Researching the solvency of diantipyrinylmethane, the author adopted to solubilize diantipyrinylmethane in the medium of hydrochloric acido5) Researching the interference of several common foreign ions, through enrichment and seperation, then determining its recoveries.6) Since xylenol orange interferes to determine some metal ions, such as iron, nickel, the author researched to determine them using EDTA.