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Coventry 02476 421213    Hawarden 0124 452 8744    Dublin +353 (0)1 864 3854

Guidance on Deviating Samples - Instructions

Guidance has been provided by the Laboratory Committee of the European Cooperations for Accreditation, relating to the preservation, handling and storage of samples prior to, and during analysis and the effect of this on the validity of test results. As a result the United Kingdom Accreditation Service (UKAS) has strengthened its focus in this area and issued Technical Policy Statement 65 on Deviating Samples. The LCECA & UKAS guidance is that where samples are not adequately preserved then the results generated from their analysis, while still accredited as being representative of the sample at the time of analysis, may not represent the sample at the point of sampling. Therefore to protect the integrity of the customers data  where samples have not been handled in line with stated requirements then reported results should be annotated to the effect the validity of the result may have affected.

In order to ensure that our customers results retain their full integrity ALS Environmental have improved the service we offer for Chemistry and Microbiology wastewater analysis by making changes to our working practices to ensure that the requirements of this new guidance are met. Key areas of focus are:

  • Reviewing sampling and analytical methodology to ensure the maximum possible sample preservation time.
  • Provision of the most appropriate containers and sample storage prior to receipt at the laboratory.
  • Identifying the date on which samples are taken; Clarifying the time in which samples must be provided to us to ensure that maximum sample preservation times are not exceeded;
  • Reviewing our laboratory working practices to ensure the commencement of analysis within the maximum sample preservations times.

For more information on current maximum preservation times:

For further information on our bottle guides:

Some of the changes may have an impact on your working practices and we look forward to working together to prepare our customers about what these changes will mean for them.