This laboratory paper tests aloe leaf powder for zinc and sodium adsorption. It is retained as remediation literature with serious quantitative limitations: negative zinc concentration estimates and a reported 500% sodium removal invalidate the paper’s efficacy claims as treatment evidence.
Key numbers
Reported zinc removal: 9.495% at 1.4% aloe, 10.237% at 4% aloe (p 3 prose; Table 3 rounds to 10.24% but labels the metal sodium). Table 2 reports zinc estimates −9.536363636 ppm for both a treated sample and the control, and 7.072727273 ppm at 1.4% aloe. Sodium Table 5 reports 500%, which cannot represent ordinary removal efficiency. These are preserved as source-error diagnostics, not accepted physical removal results.
Tables 1–5 retain the full pH series, calibration concentrations/responses and sample estimates in structured context records.
Methods (brief)
Aloe leaves shade-dried for two weeks, heated at 50–60°C and ground; phosphoric-acid pretreatment described. Adsorption at 37°C and 120 rpm, 25–40 minutes. Zn measured by AAS, Na by flame photometry. Dose percentages differ across Methods, tables and prose; wastewater sampling origin and replication are not adequately described.
Implications
Documents an attempted biosorption approach and a reproducibility gap. It cannot support validated percentage removal, potable-water safety or aloe-based treatment efficacy. Sodium data are auxiliary diagnostics.
Evidence Fitness: EF-X for claimed quantitative efficacy because calibration outputs and removal arithmetic are internally inconsistent; retain explicit context-only experimental records.
Related evidence
- Remediation evidence — drivers and interventions
- Irrigation water and soil amendments as anthropogenic inputs to cropland
- Zinc
Update history
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