Table 2 Water quality test standards used along with Apparatus used and threshold values of WHO and FAO.
Parameters | Units | Apparatus | Accuracy | Test standard | WHO drinking water limits | FAO limits for agricultural use |
|---|---|---|---|---|---|---|
PH |  | PH meter with Buffer solution |  ± 0.002 | ASTM D1293-99 | 6.5–8.5 | 5–8.5 |
Color | TCU | Multi-parameter Photometer | Â | ASTM D1209-05 | 5 | Unpleasant/Acceptable |
Taste and Odor | Â | Acceptable/Non-Acceptable | Â | ASTM E2892-15 | Acceptable | Unpleasant/Acceptable |
Total Suspended Solids (TSS) | mg/L | Filter paper, beaker, Desiccators, titration assembly, vacuum pump, and conical flask |  ± 0.5% | ASTM D5907-18 | 25 | 120 |
Total Dissolved Solids (TDS) | mg/L | Filter paper, beaker, Desiccators, titration assembly, vacuum pump, and conical flask |  ± 0.5% | ASTM D5907-10 | 300 | 0–2000 |
Electric Conductivity (EC) | µs/cm | DDS-22C High Accuracy Digital Conductivity meter |  ± 1.0% | ASTM D1225-14 | 400 |  > 3 |
Dissolved Oxygen (DO) | mg/L | BOD bottles and other related chemicals |  ± 1.0% | ASTM D888-09 | 6.5–8 | 5.0–8.0 |
Biochemical Oxygen Demand (BOD) | mg/L | BOD bottles and other related chemicals |  ± 1.0% | ASTM D2329-68 | 0 | 80 |
Chemical Oxygen Demand (COD) | mg/L | BOD bottles and other related chemicals |  ± 1.0% | ASTM D1252-06 |  < 250 | 150 |
