Substances handling

The potential hazards of most water-reactive materials are generally well known because of the precautions required for their safe handling. Substances that are water reactive will nearly always be identified as such on their MSDSs or International Chemical Safety Cards. They may be identified as DOT/UN Hazard Class 4.3 materials for shipping purposes and labeled as "dangerous when wet." However, some water-reactive materials... 

If one needs to handle substances whose properties are unknown, a survey of the literature should be done first to determine whether the substances in question are known to be hazardous. If the literature provides enough information and data, no further evaluation is necessary. The substances should be treated in accordance with the instructions described in the references. 

Use appropriate respiratory protection when handling substances with acute toxicities... 

The characterization of a dust combustion risk, which means the assessment of hazards related to handling substances in the presence of settled dust, is commonly based on the following safety technical numbers ... 

An assembly for carrying out the crystallization at low temperature, for handling substances from medium to large scale, is shown in Fig. 3.14. 

Handled substances (starting materials, intermediates, side and end products, fuels, residues)... 

It cannot offer a complete solution, but because of its knowledge and experience in handling substances, their processing and utilization as well as preparation and reuse it can mold important sections of this model [16], [17]. This is reflected in the following contributions ... 

Paragraphs 19g to 1 present standards for handling substances hazardous to water. The substances are compiled in a catalog. They are subdivided into classes (Wassergefahrdungsklassen, WGK) according to their water-hazard potential ... 

When handling substances at places where no engineering controls reasonably can be provided (for instance on wards)... 

Prison officers face the threat of violence, for example, because of the nature of the prisoner, or the way the prisoner perceives themself being handled. Substance abuse can lead to violence. 

Easy-to-Use Workplace Control Scheme (COSHH-BAuA tool)/ EMKG-Expo-Tool. Screening-level tool that predicts exposure via inhalation considering two principal factors the exposure potential of the handled substance and the applied control strategy. 

The three crown ethers which have been most widely used are dibenzo-18-crown-6 [39], dicyclohexyl-18-crown-6 [39] and 18-crown-6 [46]. The dibenzo crown (7) owes its popularity to the fact that a straightforward and efficient preparation of this stable and readily handled substance was published early and a detailed procedure is available in Organic Syntheses [43]. The difficulties with this compound are two-fold. First, it is not one of the better cation complexing crowns [40, 47],... 

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