Provtagnings- och analysstrategi för lämplig mätosäkerhet

Sammanfattning: Prior to the remediation of brownfields, extensive sampling and analysing isdone. The planned and reached measurement uncertainties are seldom asked forcontracting such types of investigations. Therefore they are usually not statednor discussed in the tenders. Requirement for the performance of qualitycontrols generatingusable uncertainty estimates are seldom and no usefuluncertainty levels are either assumed. Such lack ofrequirements means that theuncertainty levels, of theresults used to draw conclusions, are often unknownmaking those conclusions uncertain. A further consequence is the absence ofverification if the used sampling and analytical strategies were appropriate, or ifother approaches should be used in future investigations.The aim of this thesis was to identify the relevant uncertainties in theinvestigation of contaminated soil, showhow they can be assessed by samplingand statistical evaluationsand how appropriate measurement uncertainty can beobtained by choosing analytical as well as sampling strategies.The study concluded that at a minimum, the measurement uncertainty in anenvironmental investigation should be properly estimated with all significantuncertainties listed and assessed, and kept as low aspossible based on availableresources.With forthcoming demands of certified samplers, the quality controls isexpected to increase and thereby theknowledge of uncertainty sources. Goodpractice and the needs for improvement will be identified. Quality controlsampling and statistical methods are available to assess the more commonsources of uncertainty, andsampling and analyticalmethods are applicable toreduce their effect.Increasing the use of more dynamic sampling strategies and analytical methods,the meas