Development and validation of a differential scanning calorimetry purity determination method for polycyclic aromatic hydrocarbons

Phosphorus and Sulfur Co‐Doped Cobaltous Oxide Synthesized by an Inorganic‐Salt‐Assisted Method: Reaction Mechanism and Electrocatalytic Application

“…The shift of endothermic peak is often found when any change takes place in the composition of material or decomposition occurs of the tested material through changing the heating rate to the material or impurity develops in the material system as observed for KS in this study. [51,52] In the present circumstance, the impurities at the binary mixture of pure KS and Co-PPh 3 were generated from the fragmented species of the decomposed precursor (Co-PPh 3 ) at around 300 o C (Figure 6d) and the subsequent reaction (reduction by CO or CO 2 , or H 2 ) with the pure KS. Therefore, the overall mass loss (4.8%) was due to the discharged gases within the temperature window of 500-900 °C which was 15 times lower than the pure Co-PPh 3 precursor (61.8%).…”

The experience of implementing a quality management system at the Materials Metrology Division (Dimat)-Inmetro: a practical approach

“…In such cases, the measurement uncertainty can be estimated by validation studies. For example, using reference materials Temmerman et al [18] evaluated the measurement uncertainty of particle size values measured with transmission electron microscopy and Kestens et al [19] used reference materials to evaluate the uncertainty of differential scanning calorimetry tests for purity determination. • Handling test items: Procedures for handling test items should guarantee not only the integrity of the item, but also results trackability.…”

Key Aspects for Implementing ISO/IEC 17025 Quality Management Systems at Materials Science Laboratories

“…This approach could be expensive and time consuming due to the large number of measurements that must be carried out in order to explore the influence of all the relevant experimental parameters on the results. One example is the use of the top-down approach to evaluate the uncertainty associated with purity analysis by using differential scanning calorimetry (DSC) [27]. Furthermore, in some cases, the applied procedure could become ineffective if future tests must be performed under experimental conditions not contemplated in the experimental design used for uncertainty evaluation.…”