Ofiyen, Charlie, and Dwi Puryanti. 2022. “Penentuan Kualitas Air Muara Sungai Batang Arau Melalui Pengujian Total Dissolved Solid (TDS), Total Suspended Solid (TSS), Dan Kandungan Logam Berat”. Jurnal Fisika Unand 11 (3):278-84. https://doi.org/10.25077/jfu.11.3.278-284.2022.