The dithizone is commonly known as the lead reagent, chemical reagent.
Determination of zinc: In the acetate buffer medium with a pH of 4.0-5.5, zinc ion and dithizone form a red chelate complex. After extraction with carbon tetrachloride, a spectrophotometric determination is performed at a wavelength of 535 nm. When there are a small number of metal ions such as lead, mercury, copper, cadmium, nickel, cobalt, bismuth, tin, palladium, tin, and tin in the water sample, it will interfere with the determination of zinc, but sodium thiosulfate can be used as a masking agent and control agent. pH is eliminated. , The lowest detection limit of dithizone spectrophotometry for lead is 0.010mg/L, and the upper limit is 0.30mg/L (GB7470-87). The minimum detection limit for cadmium is 1μg/L, and the upper limit is 50μg/L (GB7471-87); the minimum detection limit for zinc is 5μg/L, and the upper limit is 50μg/L (GB7472-87).
Determination of mercury, the water sample is digested with potassium permanganate solution and potassium persulfate (oxidant) solution in an acidic medium at 95 ℃, after the inorganic mercury and organic mercury are converted into divalent mercury, the excess oxidant is reduced with hydroxylamine hydrochloride solution, add dithizone solution, react with mercury ions to form orange chelate, extract with chloroform or carbon tetrachloride, then add lye to wash off excess dithizone in the extract, measure its absorbance at 485nm wavelength, quantified by the standard curve method.
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