Skip to main content

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