UCL Department of Geography


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UCL Home  /  Geography  /  Resources  /  Laboratory  /  Laboratory Methods  /  Water Analysis  /  Water Sampling

Water Sampling

  1. Obtain pH, temperature and conductivity readings in triplicate.
  2. 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)
  3. Collect 100 ml of unfiltered water TP analysis.
  4. Filter 100 ml water with GF/F filters for filterable reactive phosphorus and nitrate nitrogen.
  5. 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.
  6. Rinse filter apparatus well and then filter 100 ml water with cellulose nitrate filters (0.45 µm pore size) for silica analysis.
  7. 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.