Representative sample terms Links

Experimental data for two samples IR 1 and IR 2 of different cross-linking density are represented in terms of reduced stress [ t], reduced orientation function [ S 1, and normalized ratio in Figs 3, 4 and 5, respectively- Continuoul curves were calculated by making use of the equations derived in the preceding theoretical part with the parameters listed in Table I-... 

RMs represent an important tool for demonstrating the traceability of analytical measurements to given references. One should keep in mind that the traceability of chemical analyses is often more difficult to demonstrate than for physical measurements. This is due to major differences in the measurement processes (e.g., matrix influence on chemical analyses, various analytical problems linked to the analytes and the methods used, need for sample pretreatment, etc.). Contrary to physical measurements, the calibrants and CRMs used for chemical analyses are not only used for instrument calibration but also for a variety of other purposes (e.g., method validation). In terms of traceability, the theory implies that the certified values of a substance in a CRM should be traceable to the amoimt of the given substance expressed according to the relevant SI unit, i.e., the mol. Since there is no reference mol , this traceability can be established only in relation to the mass SI unit, i.e., the kg. 

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