Acid deposition occurred as the impact of air pollution due to the increased emissions of SO2
and NOx. If the acidic compounds fall into the inland aquatic (lake, river, or spring), it will
disrupt the proliferation of organisms. Based on the previous study, low pH in inland aquatic
generally aff ected the species diversity and plankton composition. This study aimed to fi gure
out the impact of acid deposition in Situ Patengan - Bandung based on frequent monitoring.
The study was undertaken in May, June, and September 2017 and March, June, October
2018 at 3 (three) sites, represented middle, inlet, and outlet of lake using survey method to
conduct data collection. Plankton was identifi ed using a microscope and calculated by the cell
counting method. The results showed that the highest number of genera for phytoplankton
in Situ Patengan was found in October 2017 whereas, the highest number of genera for
zooplankton was found in May 2017. The range of diversity index (H’) was 0.13 – 1.45
for zooplankton and 0.61 – 1.73 for phytoplankton. The dominance index of zooplankton
was 0.25 - 0.68 and phytoplankton was 0.14 – 0.40. The pH of Situ Patengan range from
7.5 to 8.6, while the average concentration of dominant ions were 6.7 mg/L of SO4
2- and 6.2
mg/L of Ca2+, respectively. Pearson correlation analysis of H+ and the abundance of both
zooplankton and phytoplankton showed a very weak correlation. The pH range of 7.5 – 8.6
did not signifi cantly aff ect the abundance of plankton. There were no obvious impact of acid
deposition on inland aquatic had been detected in Situ Patengan during the investigated period.