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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