|Sweetnam, C. (2004) Water quality sampling procedures. MSc, Institute of Technology, Sligo.
|Sampling is the first operational stage in any water quality monitoring programme. No matter
how good the analytical method is or how carefully the analysis is performed if the sampling is
not carried out correctly then subsequent analytical results will not be representative of the water
Detailed water sampling requirements are specified in ISO 5667. A questionnaire found that no
laboratory, which responded, is currently accredited or in the process of attaining accreditation to
this standard. In general, the procedures and practices in environmental laboratories questioned
fall significantly short of the requirements of ISO 5667, particularly in relation to the
preservation of samples, the documentation of sampling training procedures and the maintenance
of training records.
Information received from the questionnaire indicated similar trends between Limerick County
Council and other Local Authority (LA) laboratories. For example, LA laboratories generally do
not preserve samples, very few analyse quality control field blanks or have considered obtaining
accreditation specifically to ISO 5667. The trends in EPA laboratories are somewhat different
from those in LA laboratories in that all of the laboratories use chain-of custody forms and most
analyse quality control field blanks and preserve samples. The majority of EPA laboratories have
considered obtaining accreditation specifically to ISO 5667, although none are in the process of
Current water sampling procedures and practices employed at the environmental laboratory of
Limerick County Council were used, as a case study, to determine the level of work required to
achieve ISO 5667 accreditation. This study revealed that approximately 80% of the
requirements of ISO 5667 could be implemented using existing facilities provided adequate
resources are allocated e.g. the documentation and implementation of comprehensive sampling
programmes and sampling procedures and the maintenance of detailed records. The
implementation of the remainder of the requirements would however, require specific expertise,
unlikely to be available within most laboratories For example, ISO requires that sampling
locations should be assessed for stratification and degree of turbulence. This information could
not be readily obtained using existing resources and therefore external consultants would have to
be employed requiring a significant financial backing.
|Water -- Quality.
|Water -- Sampling.
|Water quality sampling procedures
|Master Thesis (taught)
|Institute of Technology, Sligo.
|Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND
|Environmental Science ITS