Abstract:
A research on vertical profile of phosphate in Bandar Kayangan Lembah Sari
Reservoir, Lembah Sari Village Rumbai Pesisir. This research aims to understand the
vertical profile of phosphate in this reservoir. Water samples were collected from six
station, namely station R1 and R2 in riverine zone, T1 and T2 in transition zone and L1
and L2 in lacustrine zone. There were three sampling sites in each station in the surface,
2,5 Secchi depth and bottom.
The result shown phosphate range 0,017-0,247 mg/l, pH was 5, dissolved
oxygen (DO) 2,6-6,8 mg/l, biological oxygen demand (BOD5) 3,8-7,4 mg/l, ammonia
0,06-0,29 mg/l, transparancy 47,0-55,8 cm, temperature 31-31,70oC, depth 1,6-5,0 m.
Based on data obtained, it can be concluded that in riverine zone, concentration
phosphate in the bottom higher than in surface, whereas in the other zone, phosphate
concentration in the surface higher than in the bottom. The concentration of phosphate
in lacustrine zone showed the trophic status was eutrophic.
