Hazardous volatile organic compounds (VOCs) are one of the critical concerns in environmental water due to their toxicity to aquatic organisms and drinking water. Therefore, rapid detection of hazardous VOCs in environmental water is highly needed as many analytical methods are limited to on-site monitoring. In this work, we designed a novel unmanned shipborne mass spectrometer (US-MS) system for the real-time and online monitoring of hazardous VOCs in environmental water. The US-MS system consists of a miniaturized mass spectrometer, an automatic sampling device, a robust unmanned ship, and other monitoring and control devices. Along with the navigation route of the US-MS system, environmental water was continuously introduced into the MS system for the online and real-time detection of hazardous VOCs via a liquid/gas exchange membrane. Analytical performances of the US-MS system were investigated by a mixture of 10 VOCs showing low limits of detection (LODs: 0.31-1.26 ng/mL), good reproducibility (RSDs: 2.93-11.03%, n = 7), and excellent quantitative ability (R2 > 0.99). Furthermore, on-site detection and online monitoring of hazardous volatile contaminants such as benzene, chloroprene, and toluene in different aquatic environments such as rivers and lakes were successfully demonstrated, showing excellent field applicability of the US-MS system. Overall, the newly developed US-MS system could perform on-site, online, and real-time monitoring of complex VOCs in environmental water, showing good performances and versatile applications in water analysis.
Oil painting represents the mainstream of modern Western painting art. The development history of Western painting art cannot be separated from the evolution of the style, subject matter and techniques of oil painting. Since its emergence, oil painting has experienced several style periods, including classicism, Romanticism, Impressionism, abstraction and so on. Among them, Impressionism, which was born in the middle of 19th century, played an important role in the history of western oil painting. It changed the style and way of oil painting popular in the past few centuries with new color theory and creative techniques. Impressionism emphasized the intuitive observation and real performance of the painting object. Since then, painting is no longer limited to the spiritual transmission of the author, and "what you paint is what you see" has gradually become one of the creation principles of Western oil painting. This paper analyzes the paintings of famous Impressionist painters with examples, sums up how Impressionist paintings skillfully use light, shadow and color to create, and discusses its referential significance for modern illustration.
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