Krivoshein Petr K, Volkov Dmitry S, Rogova Olga B, Proskurnin Mikhail A
Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia.
Department of Chemistry and Physical Chemistry of Soils, V.V. Dokuchaev Soil Science Institute, Pyzhevsky Per., 7/2, Moscow 119017, Russia.
Photoacoustics. 2020 Jan 22;18:100162. doi: 10.1016/j.pacs.2020.100162. eCollection 2020 Jun.
FTIR photoacoustic spectroscopy was used to approach inorganic matrix components and organic-matter constituents of chernozem size fractions (1-5000 μm, by dry sieving) with a different history of use (from intact steppe to permanent bare fallow, a continuous long-term field experiment). The conditions of FTIR photoacoustic measurements in continuous-scan modes were compared with attenuated total reflection measurements, the advantages of photoacoustic measurements resulting from a higher intensity of the incident radiation and signal-generating volume were discussed. Overtone peaks of quartz as a soil matrix component at 2000-1700 cm were selected as a possible internal-standard (guide) bands for the comparison of photoacoustic spectra. For different land-use samples, differences in the composition were found, which are differently manifested in normalized spectra of size fractions, with millimeter-size, 20-100 μm, and silt fraction bearing the maximum information.
傅里叶变换红外光声光谱法用于研究黑钙土不同粒径组分（通过干筛法得到1 - 5000μm粒径范围）的无机基质成分和有机物质成分，这些黑钙土具有不同的利用历史（从完整的草原到长期撂荒，这是一个连续的长期田间试验）。将连续扫描模式下傅里叶变换红外光声测量的条件与衰减全反射测量进行了比较，讨论了光声测量的优势，即入射辐射强度更高和信号产生体积更大。选择了2000 - 1700 cm处石英作为土壤基质成分的倍频峰作为光声光谱比较的可能内标（引导）带。对于不同土地利用类型的样品，发现了成分差异，这些差异在不同粒径组分的归一化光谱中表现不同，其中毫米级、20 - 100μm粒径以及粉砂粒级携带的信息最多。
