Determination of lead in phosphate ore and phosphogypsum

Abstract

A method is presented for the lead determination in calcium phosphate and -sulphate matrices. Pb is separated from the matrix by solid-liquid extraction on a Pb-selective column ''Sr * Spec'' (Eichrom) and subsequently determined by graphite furnace atomic absorption spectrometry. The yield of the chemical separation is determined by using Pb. The method is suitable in principle for any material containing more than three times the standard deviation in the blank, being 30 g kg\ Pb. Application of the method to phosphogypsum, phosphate ore, phosphoric acid and (certified) reference materials such as soils, sediments, coal fly ash, citrus leaves and cabbage yielded accurate Pb results.

Determination of 210Pb and 210Po in Environmental Samples by Alpha Ray Spectrometry Using an Extraction Chromatographic Resin

“…10 It is considered that these interactions can be related to the strong affinity of the Fe(III) ion to Sr.Spec™ resin. It can be presumed that the adsorption mechanism of Po(IV) is the same as that of Fe(III) based on the adsorption behavior of Po(IV) and the large stability constant of PoCl 6 2-(β ML =10 14 ). 2 The adsorptions of Cu(II) and Bi(III) were weak at any concentration of HCl and HNO 3 .…”

“…Vajda et al determined the distribution coefficients of Bi, Pb and Po on Sr.Spec™ in 0.5 -8 M HCl, and developed a large-column method for the separation of 210 Pb and 210 Po in standard samples. 4 The resin was applied to the separation of Pb ( 210 Pb) for measurements by thermal ionization mass spectrometry 5 , graphite furnace atomic absorption spectrometry 6 and liquid scintillation counting. 7 However, the distribution coefficients for Fe and Cu on the resin in a HNO 3 and HCl solution are not available in the literature.…”