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Table 4 Intra-day and inter-day relative standard deviations for three individual experiments and 3 days of analysis in water solution

From: A new sorbent based on MWCNTs modification for separation/preconcentration of trace amounts of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) and their determination by flame atomic absorption spectrometry

Days of analysis Inter-day RSD (%)
Pb Ni Cd Cu Cr
Day 1 3.16 2.19 2.23 1.8 3.1
Day 2 2.83 2.94 2.13 1.88 2.79
Day 3 3.57 1.63 1.87 2.14 2.3
Intra-day RSD (%) 3.12 2.17 2.01 1.82 3.31
  1. The RSDs for three replicate measurements of 10.0 μg mL−1 Cr, Ni, and Pb ions, 2.0 μg mL−1 Cd ions, and 5.0 μg mL−1 Cu ions