Sa’adah, N. ., A. . Zummah, . E. . Teguh Pribadi, and N. . Safarina. “Measurement of PH and BOD (Biological Oxygen Demand) Values in the Belahan Rejo Lake As a Monitor of Water Quality In Gresik District”. INDONESIAN JOURNAL OF CHEMICAL RESEARCH, vol. 9, no. 2, Dec. 2024, doi:10.20885/ijcr.vol9.iss2.art8.