Habibi HF. Effect of the composition of activated carbon from coconut shell and paraffin on the performance of a carbon paste electrode for the detection of Pb(II). Department of Physics, Universitas Negeri Padang [Internet]. 2025 Sep. 30 [cited 2025 Dec. 3];3(3). Available from: https://jeap.ppj.unp.ac.id/index.php/jeap/article/view/117