On the lead determination in alkali halides by spectroscopic method

The octahedral complex [PbX6](4,) (X=Cl, Br) in natrium/potassium chloride or bromide monocrystals as well as in the concentrated solutions of these a lkali halides, impurified by lead, shows a characteristic absorption in the region 250-300 nm. Using the height of this absorption band, a quantitativ e 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, wa s elaborated. Standard graphs of the peak extinction of [PbX6](4) in natriu m/potassium chloride and bromide as function of the lead concentration have been obtained.