A number of emission classification systems changed the test method and/or the classification values, like DIBT, EMICODE, and GuT. New classifications were born, e.g. Natureplus. Harmonisation of the testing protocols showed some progress. But there is also a trend to define limits for SVOC and for single substances. Not all of these parameters can be monitored with sufficient reliability. Identification of complex mixtures is done in a very different manner from lab to lab. This applies especially to terpenes and hydrocarbon mixtures.
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