Water Quality and Phytoplankton Diversity of Rattanai Reservoir Khaokho District, Petchabun Province
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Abstract
The Rattanai Reservoir is used in many ways and a source of wastewater from households and surrounding resorts. This may affect water quality change to be unsuitable for uses and affect phytoplankton in the water resource. This study aimed were to evaluate water quality and diversity of phytoplankton by collecting water samples and analyzing them for quality, cadmium content, and lead content, and to characterize the diversity of phytoplankton in each season of the year. Data were collected from 3 stations, twice a season. The results revealed that water quality in all seasons were similar. During the year, the range was from 5.10–9.48 mg/L for dissolved oxygen content, 24.2–27.7°C for temperature, 7.0–7.7 for pH, 0
mg/L for ammonia, 38–44 mg/L as CaCO3 for alkalinity, 16.57–18.45 Pt-Co Unit for color, 55–76 mg/L for solid content, 8.09–12.36 NTU for turbidity, 140–175 MPN/100 mL for coliforms bacteria values, and cadmium and lead were not detected in the water sources. The water quality was
categorized as the standard for surface water quality class 2, which indicated possibility to be utilized for consumption. Four divisions (a total of 19 genus) of phytoplankton was found, i.e., Chlorophyta, Bacillariophyta, Cyanophyta and Euglenophyta. The diversity of plankton was largest in summer season, followed by winter and rainy seasons, respectively. Therefore, water in the Rattanai Reservoir (Khaokho district, Petchabun province) could be used for consumption (if they be sterilized or treated) and for agricultural productions.
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