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Table 1.

Water quality parameters of River Brahmaputra at different stations in Assam, India during 1996–1998 (from Anon., 2000).

Stations Temp. Trans. DO pH CO2 TA Cond. TDS TH Cl Si DOM NO3 PO4 
Sadiya 17.8 87.2 7.32 7.5 2.22 68.02 149 75.2 78 19.6 1.59 0.022 0.016 
Dibrugarh 18.7 43.5 7.63 1.58 57.51 137.1 69.5 65.6 19.6 4.7 1.41 0.038 0.005 
Jorhat 18 36.9 7.92 7.62 1.14 71 155.3 78.5 72.8 29.4 4.8 1.68 0.018 0.004 
Bishwanathghat 18 43 8.45 7.63 1.27 64.6 156.7 79 73.6 19.6 5.3 1.84 0.03 0.004 
Tezpur* 18.7 39.5 7.77 7.7 1.65 61.56 145.2 74.7 70.82 19.6 4.9 1.75 0.025 0.003 
Guwahati 19.2 38 7.73 7.5 1.52 71.2 150.8 76.1 79.68 22.5 5.2 1.39 0.036 0.007 
Goalpara 19.6 43.2 8.12 7.9 1.2 76.23 174.6 88.06 84.34 27.3 5.7 1.54 0.024 0.005 
Dhubri 21.2 40.1 7.7 7.7 0.93 60.75 136 68.5 60.24 26.5 5.8 1.49 0.019 0.005 
Stations Temp. Trans. DO pH CO2 TA Cond. TDS TH Cl Si DOM NO3 PO4 
Sadiya 17.8 87.2 7.32 7.5 2.22 68.02 149 75.2 78 19.6 1.59 0.022 0.016 
Dibrugarh 18.7 43.5 7.63 1.58 57.51 137.1 69.5 65.6 19.6 4.7 1.41 0.038 0.005 
Jorhat 18 36.9 7.92 7.62 1.14 71 155.3 78.5 72.8 29.4 4.8 1.68 0.018 0.004 
Bishwanathghat 18 43 8.45 7.63 1.27 64.6 156.7 79 73.6 19.6 5.3 1.84 0.03 0.004 
Tezpur* 18.7 39.5 7.77 7.7 1.65 61.56 145.2 74.7 70.82 19.6 4.9 1.75 0.025 0.003 
Guwahati 19.2 38 7.73 7.5 1.52 71.2 150.8 76.1 79.68 22.5 5.2 1.39 0.036 0.007 
Goalpara 19.6 43.2 8.12 7.9 1.2 76.23 174.6 88.06 84.34 27.3 5.7 1.54 0.024 0.005 
Dhubri 21.2 40.1 7.7 7.7 0.93 60.75 136 68.5 60.24 26.5 5.8 1.49 0.019 0.005 

All values are expressed as mg l-1, unless otherwise stated; Temp. = Water temperature (°C), Trans. = transparency (cm), DO = dissolved oxygen, CO2 = Free carbon dioxide, TA = total alkalinity, Cond. = specific conductivity (µmhos), TDS = total dissolved solids, Ca = calcium, Mg = magnesium, TH = total hardness (as mg CaCo3 l-1), Cl = chloride, Si = silicate, DOM = dissolved organic matter, NO3 = nitrate and PO4 = phosphate.

At Tezpur, studies were carried out at Forest ghat.

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