The octahedral complex [PbX₆]^4- (X=Cl, Br) in natrium/potassium chloride or bromide monocrystals as well as in the concentrated solutions of these alkali halides, impurified by lead, shows a characteristic absorption in the region 250-300 nm. Using the height of this absorption band, a quantitative method for determination of lead in the range 8x10¹⁴ - 3.2x10¹⁶ atoms/cm³ of halide monocrystals or 0.5 - 20 mg/ml of solutions respectively, was elaborated. Standard graphs of the peak extinction of [PbX₆]^4- in natrium/potassium chloride and bromide as function of the lead concentration have been obtained.

Keywords: lead determination, alkali halides, monocrystals, spectrophotometric method, ppm of lead, octahedral complexes

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