Water: Monitoring & Assessment
Table 5.2
Method | Location (Lab or Field) |
Comments | Table 5.2 Summary of chemical monitoring methods Volunteers can measure some parameters in the field or in the laboratory. |
Dissolved Oxygen (DO) | |||
Winkler with eye dropper | Either | If lab, the sample is fixed in field and titrated in lab; must be measured within 8 hours of collection. | |
Winkler with digital titrator or buret | Either | ||
Meter | Field | The meter is fragile and must be handled carefully. | |
Biochemical Oxygen Demand (BOD) | |||
Winkler with eye dropper | 1st part - Either 2nd part - Lab |
If lab, the sample is fixed in field and titrated in lab; must be measured within 6 hours of collection. | |
Winkler with digital titrator or buret | 1st part - Either 2nd part - Lab |
If lab, the sample is fixed in field and titrated in lab; must be measured within 6 hours of collection. | |
Meter | 1st part - Either 2nd part - Lab |
The meter is fragile and must be handled carefully; must be measured within 6 hours of collection. | |
Temperature | |||
Thermometer | Field | Cannot be done in the lab. | |
pH | |||
Color comparator | Either | If lab, measured ASAP within 2 hours of collection. | |
pH "Pocket Pal" | Either | If lab, measured ASAP within 2 hours of collection. | |
Meter | Either | If lab, measured ASAP within 2 hours of collection. | |
Turbidity | |||
Meter | Either | If lab, measured ASAP within 24 hours of collection. | |
Total Orthophosphate | |||
Ascorbic Acid w/ color comparator | Either | If lab, measured within 48 hours of collection. | |
Ascorbic acid w/ spectophotometer | Either | If lab, measured within 48 hours of collection. | |
Nitrate | |||
Cadmium reduction w/ color comparator | Either | If lab, measured within 48 hours of collection. | |
Cadmium reduction w/ spectrophotometer | Either | If lab, measured within 48 hours of collection. | |
Total Solids | |||
Oven drying/weighing | Lab | Must be measured within 7 days of collection. | |
Conductivity | |||
Meter | Either | If lab, measured ASAP within 28 days of collection. | |
Total Alkalinity | |||
Titration | Either | If lab, measured within 24 hours of collection. | |
Fecal Bacteria | |||
Membrane filtration | Lab | Must be measured within 6 hours of collection. |