Table 1 Permissible limits of investigated metal ions.

From: Enhanced metal ion adsorption using ZnO-MXene nanocomposites with machine learning-based performance prediction

Heavy metal ions

Permissible limits by WHO (mg/L)

Cadmium (Cd)

0.003

Arsenic (As)

0.01

Lead (Pb)

0.01

Chromium (Cr)

0.05

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