Fatin Syahirah Rosnan’s undergraduate project digested eight medicated and non-medicated talcum powders in hydrochloric and nitric acid and read copper, lead, and nickel by atomic absorption. The repository copy holds only the title pages, contents, and abstract.
Key numbers
Abstract values, mg/L of the digest solution.
| Group | Cu | Pb | Ni |
|---|---|---|---|
| Non-medicated talcum powders | 0.046-0.085 | 0.298-0.754 | 0.025-0.160 |
| Medicated talcum powders | 0.048-0.053 | 0.449-0.596 | 0.029-0.040 |
These are solution readings, not powder concentrations. Converting them requires the sample mass and final volume, which are in chapters not included in the file. No conversion is made here. The abstract’s statement that all samples were below permissible limits compares these mg/L readings with limits it does not name.
Methods (brief)
Acid digestion with HCl and HNO3, then flame atomic absorption. The contents page lists limit of detection, limit of quantification, and precision sections that are not in the excerpt.
Evidence fitness
The excerpt shows that lead was measurable in the digests of all eight talcum powders. It cannot support a mass concentration or a limit comparison.
Limitations
Excerpt only, undergraduate work, unit not convertible, product type (baby or adult) not stated. No author email is printed.
Related evidence
Update history
No substantive edit history is available in this build. The full commit record is available in git.