Table 1 Parameters, abbreviations, units, quantification limits, permissible limits to rivers class 2 and methods. Field measurements were performed using a multiparameter probe (YSI model 556) and a portable turbidimeter (HANNA model HI 98703-0). Laboratory analyses follows the Standard Methods for the Examination of Water and Wastewater (SMWW).
Parameters | Abbreviation | Units | Quantification limits | Permissible limits—class 2 | Method |
|---|---|---|---|---|---|
Electrical conductivity | EC | µS/cm | 0.01 | – | Field measure |
Water temperature | Temp | °C | 0.1 | – | Field measure |
Turbidity | Turb | NTU | 0.01 | 100 | Field measure |
Dissolved oxygen | DO | Mg L−1 | 0.01 | > 5 | Field measure |
pH | pH | pH units | 0.01 | 6–9 | Field measure |
Total dissolved solids | TDS | mg L−1 | 10 | 500 | SMWW 2540C |
Suspended solids | SS | mg L−1 | 1 | – | SMWW 2540D |
Alcalinity | Alcal | mg/L (CaCO3) | 3 | – | SMWW 2320B |
Biological oxygen demand | BOD | mg L−1 | 2 | 5 | SMWW 5210B |
Chemical oxygen demand | COD | mg L−1 | 10 | – | SMWW 5220D |
Escherichia coli | E. coli | CFU/100 mL | 1 | 1000 | SMWW 9223A/B |
Phosphate | PO43− | mg L−1 | 0.02 | – | SMWW 4500 P E |
Total phosphorus | TP | mg L−1 | 0.02 | 0.1 | SMWW 4500 P E |
Nitrate | NO3- | mg L−1 | 1 | 10.0 | SMWW 4500D |
Ammonium | NH3 | mg L−1 | 0.06 | 3.7 (pH ≤ 7.5) | SMWW 4500F |
Total nitrogen (Kjeldahl) | TN | mg L−1 | 2 | 2.18 | SMWW 4500A |
