过去几十年来, 挥发性有机化合物(volatile organic compounds, VOCs)引发了诸多问题, VOCs是PM2.5以及臭氧的重要前体物, 也是光化学烟雾的主要组成部分, 不仅会污染环境还会对人体健康产生不利影响。 因此, 寻求一种有力的手段实现对VOCs种类检测、 实时浓度监测显得十分重要。 气体分析常用的方法是气相色谱法, 但...
Fig. 1.Diffuse reflectance infrared Fourier transform spectra of a high organic matter soil (120g C kg−1soil) across a range of KBr dilution. The most recent FTIR technique for soil analysis isattenuated total reflectance Fourier transform infrared spectroscopy(ATR-FTIR),unique in that it offer...
Raman spectroscopy allows the identification of the pigments, while the chromium-containing compounds, such as chrome alum used to size the paper substrates and the compound/s that chromium forms with the oxidized organic component in gum print images, were found to be below the detection limit ...
GC-MS和FTIR在琥珀和柯巴树脂鉴定中的应用 ㊀第19卷㊀第2期2017年㊀㊀3月㊀宝石和宝石学杂志 J o u r n a l o fG e m s a n dG e m m o l o g y V o l .19㊀N o .2M a r .㊀2017㊀收稿日期:2016-10-27作者简介:李瑾珺(1992-),女,硕士研究生,主要从事宝石学方面...
Iron oxides are major sinks of a range of environmental elements including organic compounds. In this study, the adsorption of the broadly studied model protein BSA onto the hematite mineral surface was characterized as a function of pH, ionic strength, and BSA concentration using in-situ ...
Da Silva et al.2studied the stability of sugars, proteins, amino acids, enzymes, organic acids, vitamins, minerals, and phenolic and volatile compounds in honey during heating or prolonged storage. The authors determined that the stability of these compounds in relation to the chemical reactions ...
bio-oilishighlypolarcontainingabout50wt-%oxygen,whichissignificantlymorethaninconventionalpetroleumfuels(ppmlevel)[4–7].Becauseofthehighamountofvolatilesandnonvolatileoxygen-containingcompounds,bio-oilsarenotasstableasconventionalpetroleumfuels.OasmaaandKuoppala[8]providedacomprehensiveover-viewonthestabilityofbio...
Biesinger(Submitted 6 November 1997; in revised form 23 January 1998)Coatings are applied to surfaces for a variety of reasons: to enhance their appearance, to protect the sub-strate, to augment the adhesion to other layers, or to functionalize them for further reactions. To evaluatethe ...
The increased intensity of crystalline peaks and the relative decrease of the amorphous (broad) bands (i.e., Around 20°) from sample a to c suggest an increase of the degree of crystallinity, in the same order, with the decrease of grain size. As shown in Table 1, Conclusions Thermal ...
Results from petrographic, proximate and ultimate analyses of the samples used in this study are given in Table 1. The basic information on elemental composition is as follows: 5.48–6.13 (wt%) hydrogen ranges, 1.24–2.71 (wt%) organic sulfur ranges, on a dry ash-free basis (daf), 0.82–...