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Table 4 Evaluation of intra- and inter-day precision and accuracy of the Cd(II)-CPE sensor

From: Selective and sensitive determination of Cd(II) ions in various samples using a novel modified carbon paste electrode

Samples [Cd(II)] taken (mg mL−1) Intra-day Inter-day
[Cd(II)] found (mg mL−1) Recovery (%) SD RSD* (%) [Cd(II)] found (mg mL−1) Recovery (%) SD RSD** (%)
Pure solution 0.25 0.247 98.8 0.003 1.26 0.247 98.8 0.005 2.02
0.30 0.296 98.6 0.007 2.36 0.296 98.6 0.002 0.67
River water 0.25 0.249 99.6 0.007 2.81 0.247 98.8 0.003 1.21
0.30 0.294 98.0 0.005 1.70 0.299 99.6 0.004 1.34
Industrial wastewater 0.25 0.243 97.2 0.006 2.47 0.245 98.0 0.006 2.45
0.30 0.293 97.6 0.008 2.73 0.296 98.6 0.008 2.70
Rechargeable battery waste 0.25 0.248 99.2 0.006 2.42 0.247 98.8 0.006 2.43
0.30 0.291 97.0 0.005 1.70 0.294 98.0 0.001 0.34
Plant foodstuff (carrot) 0.25 0.243 97.2 0.003 1.23 0.245 98.0 0.009 3.67
0.30 0.292 97.3 0.004 1.37 0.293 97.6 0.006 2.05
Fish tissue 0.25 0.245 98.0 0.004 1.63 0.248 99.2 0.003 1.21
0.30 0.293 97.6 0.005 1.70 0.298 99.3 0.006 2.01
  1. *Mean of four experiments carried out on the same day
  2. **Mean of four experiments carried out on different four day