mass spectrometer

简明释义

质谱分析器

英英释义

例句

1.In environmental studies, a mass spectrometer can detect trace pollutants in water samples.

在环境研究中，质谱仪可以检测水样中的微量污染物。

2.Using a mass spectrometer, scientists can determine the molecular weight of compounds.

科学家可以使用质谱仪确定化合物的分子量。

3.Researchers employed a mass spectrometer to identify the proteins in the sample.

研究人员使用质谱仪识别样品中的蛋白质。

4.The laboratory uses a mass spectrometer to analyze the composition of unknown substances.

实验室使用质谱仪分析未知物质的成分。

5.The mass spectrometer was calibrated to ensure accurate measurements.

质谱仪经过校准，以确保测量的准确性。

作文

The field of analytical chemistry has seen remarkable advancements over the past few decades, with one of the most significant being the development and widespread use of the mass spectrometer. A mass spectrometer (质谱仪) is an essential instrument used to measure the mass-to-charge ratio of ions. It provides crucial information about the composition and structure of molecules, making it invaluable in various scientific disciplines, including biochemistry, environmental science, and pharmaceuticals.At its core, a mass spectrometer operates by ionizing chemical species and sorting the ions based on their mass-to-charge ratios. The process typically involves three main steps: ionization, acceleration, and detection. First, the sample is introduced into the ion source, where it is ionized, resulting in charged particles. This can be achieved through various methods, such as electron impact, chemical ionization, or electrospray ionization.Once ionized, the ions are accelerated through an electric field, which imparts energy to them, allowing them to travel towards the detector. The detector then measures the time it takes for the ions to reach it, which correlates to their mass-to-charge ratios. By analyzing these ratios, scientists can deduce the molecular weight and structure of the compounds present in the sample.One of the key advantages of using a mass spectrometer (质谱仪) is its sensitivity and specificity. It can detect even trace amounts of substances, making it an ideal tool for applications such as drug testing, environmental monitoring, and forensic analysis. For instance, in drug testing, a mass spectrometer can identify and quantify illicit drugs in biological samples, providing critical evidence in legal cases.Moreover, the versatility of mass spectrometers is noteworthy. They can be coupled with other techniques, such as gas chromatography (GC) or liquid chromatography (LC), to enhance their analytical capabilities. This combination allows for the separation of complex mixtures before mass analysis, leading to improved resolution and accuracy in identifying compounds.In the realm of research, mass spectrometry (质谱分析) plays a pivotal role in proteomics, the large-scale study of proteins, particularly with respect to their functions and structures. By utilizing a mass spectrometer, researchers can analyze protein complexes, post-translational modifications, and interactions, which are fundamental aspects of understanding cellular processes.Furthermore, the application of mass spectrometers extends beyond traditional laboratories. In recent years, portable mass spectrometers have been developed, enabling field analysis and on-site testing. This innovation has proven beneficial in various fields, including food safety, where rapid detection of contaminants is crucial.In conclusion, the mass spectrometer (质谱仪) is a powerful analytical tool that has transformed scientific research and industry practices. Its ability to provide detailed information about molecular composition and structure makes it indispensable in modern analytical chemistry. As technology continues to advance, the capabilities of mass spectrometers will likely expand, further enhancing our understanding of complex chemical systems and contributing to innovations across multiple fields.