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Table 4 Reference doses (RFD) mg kg− 1 day− 1 for heavy metals used in this study

From: Potential health risk assessment of toxic metals contamination in clay eaten as pica (geophagia) among pregnant women of Ho in the Volta Region of Ghana

Heavy metalsReference DosesCancer slope factorReferences
Arsenic3.0 × 10−41.50[27, 29]
Copper4.0 × 10− 2N/A[29]
Lead3.5 × 10− 38.5 × 10− 3[27]
Manganese0.14N/A[29]
Nickel0.029.10 × 10− 1[29, 30]