The precipitate was heated in a water bath, where the elemental sulfur is formed while lead remains in solution.
The solution was filtered through Whatman filter paper (blue ribbon) with the addition of 10 m L 40% ammonium acetate.
Four drops of methyl red and 1 m L of 1.8N H were added, as well as glacial acid for p H adjustment.
After being centrifuged, the supernatant was taken for the analysis of lead and the precipitate was kept for radio analysis. The solution was centrifuged, the supernatant discarded and 5 m L of nitric acid (1:2) was added to the precipitate.
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The Pb to the sediment is produced at a constant flow and that the sedimentation rate is also constant [2,3].The samples were placed in a 2 L beaker and the volume was made up to 1 L with water.
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