Wang Zhongtang,Lin Jinxian,Li Sixuan,Guo Qiuju,Huang Wenna,Wen Wei,Dan Guiping,Tan Zhaoyi
To rapidly assess the contamination of actinides in emergency water, a method was developed to simultaneously analyze U, Th, Pu and Am. The method consists of two steps: extraction chromatographic separation using UTEVA and DGA resins and isotopic determination of actinides by inductively coupled plasma mass spectrometry (ICPMS). The whole analytical procedure takes only 8 h and high chemical recoveries of actinides were obtained. The cross spectral interferences between actinides in ICPMS measurement were sufficiently removed. The accuracy was validated by analyzing IAEA-443 seawater sample. The low limits of detection of actinides allow this method to distinguish low level contamination.
Sergio F. Ochoa,Andrés Neyem,José A. Pino,Marcos R.S. Borges
When extreme events affect urban areas the response process should be fast and effective because the population and civil infrastructure densities potentially increase the impact of such events. These situations have shown the need to improve the group decisionmaking process and the coordination of relief activities carried out by relief organizations. This paper proposes to include first responders as decision makers and describes a technological platform to support decision making and coordination activities among these all actors involved. The supporting platform provides digital communication and information recording, representation and dissemination capabilities among the mobile workers participating in the relief efforts. The platform could also be used to support activities in scenarios similar to this one (e.g. police and military operations, massive social events).
The development of rapid, sensitive ammonia (NH 3 ) sensors is crucial for emergency response as NH 3 poses serious health risks. We report a high-performance chemiresistive sensor based on Ti 3 C 2 MXene@sulfur nanosheet (MXene@S-NSs) composites that addresses the conductivity limitations of pure S-NSs. The composite combines MXene’s excellent conductivity with S-NSs’ semiconductor properties to create room-temperature NH 3 sensors with exceptional performance: 3 ppt detection limit, 375 % response signal, and remarkably fast response/recovery times of 5 s/4s − representing a significant improvement over pure S-NSs sensors. This enhancement arises from optimized charge transport through p-n heterojunctions and sulfur vacancies in the composite structure. The MXene@S-NSs material demonstrates outstanding sensitivity, stability, and response speed, making it particularly suitable for emergency NH 3 monitoring applications. This work not only presents a practical sensor solution but also establishes an effective materials design strategy for developing next-generation gas sensors through rational 2D material hybridization. The successful integration of MXene and S-NSs provides a blueprint for creating advanced sensing materials with tailored electronic properties and performance characteristics.
危险品化学品经营许可证（带存储）