Assessment of pollution load on surface water in the down-lower part of the Tapung Kiri river, Kampar regency, RiauYuliati Yuliati, Eni Sumiarsih, Eko Purwanto, Adriman Adriman, Isma Mulyani, Nurfathihayati Nurfathihayati and Kie Roger NasutionBIO Web Conf., 136 (2024) 05002DOI: https://doi.org/10.1051/bioconf/202413605002