Skip to main content

Chemical Monitoring

Each sampling site is checked for chemical water quality four times during the field season. This produces four samples per site right across our catchments. We use a two-stage process. The first involves obtaining the sample and using an electronic probe for recording supplementary data. The second stage involves laboratory analysis of each sample.

Site Sampling Procedure

Sampling Officers put a Hach HQ30d Rugged Multi-probe into a bucket of water from the site. The following measurements are recorded onto the device’s memory for downloading later:

  • dissolved oxygen (% saturation)
  • dissolved oxygen (mg/l)
  • conductivity (mS/cm)
  • Temperature (°C)

In addition, the Sampling Officers gather water samples for laboratory analysis using traditional procedures.

Quantitative Analysis of Chemical Parameters

The following chemical parameters are analysed in our laboratory:

  • ammonia (NH3)
  • total phosphorus (PO4)
  • suspended solids (SS)
  • biochemical oxygen demand (BOD).

Quality Assurance

As part of the biological and chemical monitoring of freshwaters, it is necessary to undertake a quality assurance programme. Essentially this involves two main stages:

  • quality assurance in field data-gathering techniques
  • quality assurance in laboratory analysis.

The former involves a random assessment of techniques across the catchments. It allows for standardisation across the Agency and helps minimise inaccuracies.

In the latter, outside laboratories are used to verify results from our own laboratories.

COVID-19 UPDATE

Following the Government’s advice in relation to COVID-19, Loughs Agency has put in place a number of measures to maximise our capacity to continue to deliver our services as best we can.