IMPROVING THE DETERMINATION OF LEAD BY ATOMIC-ABSORPTION IN MATERIALS OF METALLURGICAL PRODUCTION WITH SEPARATION OF THE BASE

For separating lead from a mineral or metal base the lead is precipitated in the form of thioacetamide sulfide at pH 7. 5 in the presence of tartaric acid as complexing agent. The object of the present work is to increase the speed and lower the lower limit of determining the lead content. As a result of the work it was established that reducing the coagulation time of the sulfide precipitate from 2 hr to 20 min does not affect the completeness of precipitation of lead and the results of its determination by the method of atomic absorption. The use of the analytical line 217 nm in the present work made it possible to double the sensitivity of determining lead. The work was carried out with an atomic-absorption spectrometer the atomizer was an acetylene-air flame.