Water Sampling
- Obtain pH, temperature and conductivity readings in triplicate.
- Perform an alkalinity titration on 100 ml of water using bromo-cresol green methyl red indicator. This is titrated to a pinky-grey/green end point. This should be performed 3 times per site. (Note - this method is for Total Alkalinity)
- Collect 100 ml of unfiltered water TP analysis.
- Filter 100 ml water with GF/F filters for filterable reactive phosphorus and nitrate nitrogen.
- Filter 100 ml water each with GF/F filters for cation analysis. The latter should be acidified to pH 2.0 with Aristar grade conc. nitric acid.
- Rinse filter apparatus well and then filter 100 ml water with cellulose nitrate filters (0.45 µm pore size) for silica analysis.
- Rinse again and prepare a series of field blanks with deionised water. There should be 100 ml unfiltered, 200 ml filtered with GF/F, a sterilin of GF/F filtered and acidified, and a sterilin of cellulose nitrate filtered water.
All collection vessels should be acid washed prior to sampling.