NIOSH researchers evaluated a textured wipe containing a cationic surfactant and citric acid after controlled lead-dust application to volunteers’ hands. The paper measures lead remaining on skin after cleaning. It does not measure lead contamination in the cleansing products or report a trial in babies.
Key numbers
| Experiment or method | Source-reported result | Location |
|---|---|---|
| Early challenge dose | 3,000 µg Pb on both hands; five replicates per method | pp73–75; Figures 2–3 |
| Two treated wipes followed by rinse | Approximately 2.5 µg Pb remaining | p74, protocol D; Figure 3 |
| Blinded comparison | 14 participants; each cleanser used twice by each participant | pp76–77; Figure 5 |
| Pre-commercial evaluation | Nine volunteers; reported removal 99.7–99.9% | p78, Table 3 |
| Post-cleaning Pb in that evaluation | 1.6–6.6 µg collected by two serial handwipes | Table 3; range of its individual rows |
| Analytical detection/quantitation limits | 0.3/0.86 µg Pb per sample | p72 |
Table 3 preserves each volunteer’s background, weighed challenge, spill recovery, calculated applied mass, final recovered lead and source-calculated removal. Four background estimates lie between the detection and quantitation limits. Graphically read results and intervals are marked approximate; they are not substituted for raw participant measurements.
Methods (brief)
Researchers applied lead-oxide dust or a lead-oxide/cornstarch mixture to both palms. Cleansing protocols varied wipe texture, surfactant/acid treatment, number of wipes and rinsing. Background and post-cleaning lead were measured with wipe sampling followed by acid digestion and ICP-AES. The nine-person evaluation collected loading losses from wax paper and used two serial post-cleaning wipes. The blinded experiment used repeated comparisons within participants.
Evidence fitness
Supports controlled dermal-decontamination and wipe-sampling research. The results concern experimentally applied lead on hands; they do not establish impurity levels in wipes, oral exposure doses, blood-lead reduction or clinical benefit. A lightly textured baby wipe served as an experimental substrate after added treatment, which does not validate ordinary baby-wipe performance or infant use.
Limitations
Early replicates were performed on researchers’ hands. One comparison describes 14 volunteers while its figure caption states n=5 per cleanser, leaving the exact replicate relationship unclear. Detailed participant demographics and independent long-term replication are not supplied. Formulation developers evaluated their own patented and licensed technology. Skin-safety statements refer to earlier research, and the paper reports no pediatric safety study. Residual collection is an operational sampling endpoint, not proof that every lead particle or absorbed lead was removed.
Related evidence
- Lead
- Cat 2 (Children Personal Care) non-ingestion exposure pathways
- Remediation evidence — drivers and interventions
Update history
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