Figure 4: Lead content in the bioavailable (Pb_bioav) and the recoverable (Pb_recov) fractions compared to total content (by ICP-MS), their relative percentage; and their ²⁰⁶Pb/²⁰⁷Pb and ²⁰⁸Pb/²⁰⁷Pb ratios for SS10T01 core. The 206Pb/207Pb and 208Pb/207Pb characteristic of ceramic factory samples P3 (continuous line) and P4 (dashed line) are shown for allowing comparison [10].