Current Issue : July-September Volume : 2014 Issue Number : 3 Articles : 2 Articles
The river water quality monitoring is most vital aspect for various uses. Diatoms are an ecologically important group in most aquatic ecosystems but are often ignored as indicators of river environment change. Diatoms are used as bio-indicators to assess the water quality of surface waters. Diatoms are used as bio-indicators to assess the water quality of surface waters. Sixty (60) species belonging to 21 genera are recorded from cauvery river. Water samples are assessed by analyzing the various physico-chemical parameters, such as pH, electrical conductivity (μs/cm), dissolved solid (mg/l), biochemical oxygen demand (BOD) (mg/l), calcium (Ca) (mg/l), magnesium (Mg) (mg/l), sodium (Na) (mg/l), potassium (K) (mg/l), chloride (Cl) (mg/l), bicarbonate (HCO3) (mg/l) and sulphate (SO4) (mg/l). These 8 parameters are considered to compute the water quality index. The results of the present study on diatom assemblages in cauvery river at siluvampalayam and koneripatti indicates moderate pollution, while at peramachipalayam, kottampatty, sanyasipatti and bhavani shows high level of pollution. The water quality index reveals that water of river cauvery to be unpolluted in the upstream of the city and unfit for human consumption towards the downstream at bhavani town. The values of DO and BOD levels indicate the absence of major organic pollution sources. In the present study an attempt has been made to evaluate the applicability of diatom based indices for water quality assessment in cauvery river in part of Tamil Nadu. The results of the present study shows that the Cauvery river water is not polluted in mettur area whereas it is highly polluted near bhavani area. All results are compared with national river water quality standards....
The present paper deals with the study of diatoms as indicators of water quality in yercaud lake, Salem district, Tamil Nadu, South India. Forty macrophytes samples and water samples are collected from yercaud lake in pre and post monsoon during 2011-13 and forty two (42) diatom species are recorded from these samples. Among the diatom species, a limited number of them (Amphora ovalis, Bacillaria paxillifer, Cyclotella meneghiniana, Cymbella tumida, Eunotia curvate, Fragilaria intermedia, Gomphonema lanceolatum, G. parvulum, G. undulatum, Nitzschia palea, Synedra ulna) are recorded throughout the year, while the diatom species such as Cyclotella meneghiniana, Gomphonema parvulum, G. undulatum, Navicula mutica, Nitzschia sigma, N. microcephala, N. palea, Pinnularia acrosphaeria, Surirella linearis and Synedra ulna are distributed in different locations of the lake. The physicochemical parameters such as temperature (°C), total dissolved solids (TDS), electrical conductivity (EC) (µs/cm), pH, total alkalinity (TA) (mg/l), salinity (ppm), calcium hardness (CH) (mg/l), magnesium hardness (MH) (mg/l), total hardness (TH) (mg/l) and total solids (TS) (mg/l) are analysed at TWAD board laboratory Salem to understand the water quality. The total diatom density showed significant positive relationship with respect to electrical conductivity (EC) and total dissolved solids (TDS) and significant positive correlation with chemical oxygen demand (COD). The analyses of pH, conductance, alkalinity and hardness levels indicate the moderate quality of water in yercaud lake. The values of DO, BOD and COD levels are very low indicating the absence of major organic pollution. The present study records the abundance of pollution tolerant species during pre-monsoon period due to the merger of sewage in yercaud lake....
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