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Table 5 Ruggedness and Robustness of the methylphenidate sensors

From: New potentiometric sensors for methylphenidate detection based on host–guest interaction

Parameters

Sensor 1

Sensor 2

Sensor 3

Recovery, %

RSD, %

Recovery, %

RSD, %

Recovery, %

RSD, %

Operators 1

98.52

2.2

98.0

2.16

99.24

2.45

2

98.33

2.3

98.5

3.34

99.21

2.75

Instrument 1a

98.51

2.3

98.0

2.53

99.12

2.62

2

98.41

2.4

97.5

3.64

98.51

2.53

Change in day

 Intra-day

100.74

2.38

100.26

2.18

101.33

2.21

 Inter-day

98.33

2.5

97.1

2.4

99.23

2.7

Life time during

 After 8 weeks

97.5

3.9

97.0

3.8

98.0

3.96

  1. aComparison between two instrument (HANNA pH 211 and WTW pH/mV meter (model 523; 8120 Weilheim, Germany