A New Sensitive Sensor for Simultaneous Differential Pulse Voltammetric Determination of Codeine and Acetaminophen Using a Hydroquinone Derivative and Multiwall Carbon Nanotubes Carbon Paste Electrode

Table 2

Interference study of some species for the determination of 40.0 M of codeine at HTP-MWCNT-CPE.

Foreign species	Molar ratio (foreign species/codeine)
Na^+, K^+, Ca^2+, Cl^−, and	1000
Urea	695
Uric acid	675
Methadone, Tramadol	310
Morphine	5
Ascorbic acid	1