Prinsip Kerja Sensor Elektrokimia dalam Penentuan Chemical Oxygen Demand (COD): Review
DOI:
https://doi.org/10.21460/sciscitatio.2025.61.189Keywords:
chemical oxygen demand, sensor elektrokimia, degradasi fotokatalitik, oksidasi elektrokatalitikAbstract
Peningkatan kebutuhan sumber air akibat tingginya populasi masyarakat memerlukan perhatian
terhadap uji kualitas air. Chemical Oxygen Demand (COD) adalah indikator jumlah limbah organik di dalam
air. Penggunaan sensor elektrokimia dalam pengukuran COD memberikan keuntungan lebih, seperti
sensitivitas tinggi dan biaya murah. Pengukuran COD menggunakan sensor elektrokimia didasarkan pada
reaksi oksidasi elektrokimia senyawa organik melalui reaksi dengan radikal hidroksil (.OH) pada elektroda
kerja (WE). Terdapat 2 prinsip kerja yang digunakan dalam reaksi oksidasi limbah organik, yaitu degradasi
fotokatalitik dan oksidasi elektrokatalitik. Melalui degradasi fotokatalitik, limbah organik dioksidasi pada
permukaan material fotokatalitik di bawah pencahayaan (light illumination) yang telah menghasilkan radikal
hidroksil (.OH). Pada oksidasi elektrokatalitik menggunakan anoda (BDD, PbO2, dan Cu) yang mempunyai
kemampuan elektrokatalitik untuk melakukan proses reaksi oksidasi limbah organik.
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