“…It is, in fact, absolutely necessary to modify the conventional electrodes such as carbon paste ( Bijad et al, 2017 ), screen-printed electrodes ( Jaiswal et al, 2017 ), and glassy carbon electrodes with a suitable agent ( Muthumariappan et al, 2017 ; Velmurugan et al, 2020 ; Karimi-Maleh et al, 2021 ). Electrochemical Multi-walled carbon nanotubes (MWCNT), largely used to modify the surface of electrodes for many applications ( Mani et al, 2017 ; Beitollahi et al, 2018 ; Roy et al, 2018 ; Rui et al, 2020 ; Shaikshavali et al, 2020 ; Baghayeri et al, 2021a ); are considered as an ideal choice thanks to their interesting properties. Moreover, they can be combined with metallic nanoparticles, metal organic framework or conducting polymers in order to enhance the sensitivity towards nitrite determination in different matrices ( Thirumalraj et al, 2016 ; Wan et al, 2017 ; Yu et al, 2019 ; Baghayeri et al, 2020a ; Salagare et al, 2020 ).…”