Abstract
The octahedral complex [PbX 0 ] 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 8'10 14 -3.2'10 16 atoms/cm 3 of halide monocrystals or 0.5 -20 mg/ml of solutions respectively, was elaborated. Standard graphs of the peak extinction of [PbX 6 ] 4 in natrium/potassium chloride and bromide as function of the lead concentration have been obtained.
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