Water quality of the Rangsit Prayoonsak canal

Vol. 21 NO. 1 Page 109-117

อังกฤษ

P10-ทรัพยากรน้ำ

T01-มลพิษ

CANALS;WATER QUALITY;AQUATIC INSECTS;HEAVY METALS;PESTICIDES;WATER POLLUTION

คลอง;คุณภาพน้ำ;แมลงน้ำ;โลหะหนัก;สารป้องกันกำจัดศัตรูพืช;มลพิษทางน้ำ

Preliminary study of chemical and biological water quality of the Rangsit Prayoonsak Canal for further management planning of water pollution was conducted. The results of six sampling stations showed that the canal was not contaminated by organochlorine and organophosphorus pesticides. Some organochlorine pesticides were found in sediment samples due to persistent property of the compounds during the past decade. Because the compounds have higher potential of adhering to the sediment than dissolving in water, residues found in sediment can't reflect current situation of the water quality. Heavy metal contaminations were determined in both water and sediment samples. However, in water samples, the concentrations did not exceed the surface water standards of Thailand. In sediment samples, it was observed that the concentration of heavy metals were lower than those found in the polluted areas in Bangkok. Aquatic insects found were identified into 4 orders, composing of 7 families namely Diptera (Chironomidae and Culicidae), Odonata (Coenagrionidae and Libellulidae), Ephemeroptera (Baetidae and Ephemerellidae), and Hemiptera (Notonectidae). Diversity of aquatic insects by the sampling station could indicate that urbanized waste played more important role in being the source of pollution in the canal than agricultural or industrial activities.

Preliminary study of chemical and biological water quality of the Rangsit Prayoonsak Canal for further management planning of water pollution was conducted. The results of six sampling stations showed that the canal was not contaminated by organochlorine and organophosphorus pesticides. Some organochlorine pesticides were found in sediment samples due to persistent property of the compounds during the past decade. Because the compounds have higher potential of adhering to the sediment than dissolving in water, residues found in sediment can't reflect current situation of the water quality. Heavy metal contaminations were determined in both water and sediment samples. However, in water samples, the concentrations did not exceed the surface water standards of Thailand. In sediment samples, it was observed that the concentration of heavy metals were lower than those found in the polluted areas in Bangkok. Aquatic insects found were identified into 4 orders, composing of 7 families namely Diptera (Chironomidae and Culicidae), Odonata (Coenagrionidae and Libellulidae), Ephemeroptera (Baetidae and Ephemerellidae), and Hemiptera (Notonectidae). Diversity of aquatic insects by the sampling station could indicate that urbanized waste played more important role in being the source of pollution in the canal than agricultural or industrial activities.

[1] Vanvimol Patarasiriwong (Environmental Research and Training Centre, Pathum Thani)

[1] Vanvimol Patarasiriwong (Environmental Research and Training Centre, Pathum Thani (Thailand))