On site measurements of pH, conductivity and temperature for thirteen sites in the Humber catchment and three sites in the Tweed catchment within the period 1994 to 1997 as part of the Land Ocean Interaction Study project (LOIS). Sites were sampled at regular weekly intervals and more intermittently during high flows (on average an extra sampling once a month per site). Samples were obtained using a wide neck PTFE bottle in a plastic covered bottle carrier (lowered from bridges where possible otherwise collected by immersing sample bottle by hand in the water as near the main flow as possible). pH and conductivity reading were taken using Mettler Toledo Check Mate meters and probes. Temperature readings were obtained using a PT 100 probe with a Digitron 3204 Pt meter (RS components). The measurements were carried out by members of the field sampling team at York University, as part of the Land Ocean Interaction Study (LOIS).
Publication date: 2013-07-01 ( created 2000-01-01 )
This dataset is part of the following
BODC LOIS web pages (coastal and marine)
British Oceanographic Data Centre's webpages for information on and data from the coastal and marine aspects of the LOIS project.
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The pH probes were calibrated in the laboratory using pH 7.0 and 10.00 buffers. Conductivity probes were calibrated in air and with a 1417 uS KCl standard. The calibration of the probes was checked on site for drift and recalibrated if necessary. The probes were gently swirled in a freshly collected sample for two minutes and then the average of three readings taken. A zip file containing box-and-whisker plots for each determinand, showing the range of values (median, inter-quartile range, 1.5 * inter-quartile range, outliers) recorded at each site is available to enable prospective users of the data to understand data quality.