CEQAT-DGHS interlaboratory tests for chemical safety: Validation of laboratory test methods by determining the measurement uncertainty and probability of incorrect classification including so-called "Shark profiles". (September 2021)

• Record Type: Journal Article
• Authors: Lüth, Peter; Uhlig, Steffen; Frost, Kirstin; Malow, Marcus; Michael-Schulz, Heike; Schmidt, Martin; Zakel, Sabine
• Is Part Of: Journal of loss prevention in the process industries. Volume 72(2021)
• Publication Date: 2021-09
• Subjects: Interlaboratory test -- Validation -- Measurement uncertainty -- Incorrect classification -- Shark profile; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2021.104532
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: Laboratory test results are of vital importance for correctly classifying and labelling chemicals as "hazardous" as defined in the UN Globally Harmonized System (GHS)/EC CLP Regulation or as "dangerous goods" as defined in the UN Recommendations on the Transport of Dangerous Goods. Interlaboratory tests play a decisive role in assessing the reliability of laboratory test results. Interlaboratory tests performed over the last 10 years have examined different laboratory test methods. After analysing the results of these interlaboratory tests, the following conclusions can be drawn: 1: There is a need for improvement and validation for all laboratory test methods examined. 2: To avoid any discrepancy concerning the classification and labelling of chemicals, the use of validated laboratory test methods should be state of the art, with the results accompanied by the measurement uncertainty and (if applicable) the probability of incorrect classification. This paper addresses the probability of correct/incorrect classification (for example, as dangerous goods) on the basis of the measurement deviation obtained from interlaboratory tests performed by the Centre for quality assurance for testing of dangerous goods and hazardous substances (CEQAT-DGHS) to validate laboratory test methods. This paper outlines typical results (e.g. so-called "Shark profiles" – the probability of incorrect classification as a function of the true value estimated from interlaboratory test data) as well as general conclusions and steps to be taken to guarantee that laboratory test results are fit for purpose and of high quality. Highlights: Interlaboratory comparisons were carried out over the past 10 years. There is a need for improvement and validation for all laboratory test methods. Validated laboratory test methods should be state of the art. Probability of incorrect classification and the "Shark profiles" can be calculated. "Shark profiles" can be used to discuss the requirements for classification rules .