A new approach to removing interference of moisture from FTIR spectrum

Zhang, Xiaohua; He, Aiyong; Guo, Ruyan; Zhao, Ying; Yang, Limin; Morita, Shigeaki; Xu, Yizhuang; Noda, Isao; Ozaki, Yukihiro

doi:10.1016/j.saa.2021.120373

Cited by 17 publications

(4 citation statements)

References 45 publications

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“…The energy reflected from the soil surface declines with soil roughness, due to the light diffusion on rough soil surface . The fluctuation of the local atmosphere (e.g., water vapor and CO 2 ) can cause the deviation of the actual sample spectrum within the time lapse of scanning . Soil moisture can also interfere soil parameter measurements, and the effect of soil moisture on SOC measurements has been investigated. , To overcome this challenge, a normalized index based on soil-moisture has been developed, which is a new criterion for quick assessment of surface soil moisture from reflectance data in the solar spectral range (250–2500 nm) …”

Section: Current Status and Major Challenges Of Rtcsm Data Acquisitionmentioning

confidence: 99%

A Critical Review for Real-Time Continuous Soil Monitoring: Advantages, Challenges, and Perspectives

Fan

Wang

Funk

et al. 2022

Environ. Sci. Technol.

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Most soil quality measurements have been limited to laboratory-based methods that suffer from time delay, high cost, intensive labor requirement, discrete data collection, and tedious sample pretreatment. Real-time continuous soil monitoring (RTCSM) possesses a great potential to revolutionize field measurements by providing first-hand information for continuously tracking variations of heterogeneous soil parameters and diverse pollutants in a timely manner and thus enable constant updates essential for system control and decision-making. Through a systematic literature search and comprehensive analysis of state-of-the-art RTCSM technologies, extensive discussion of their vital hurdles, and sharing of our future perspectives, this critical review bridges the knowledge gap of spatiotemporal uninterrupted soil monitoring and soil management execution. First, the barriers for reliable RTCSM data acquisition are elucidated by examining typical soil monitoring techniques (e.g., electrochemical and spectroscopic sensors). Next, the prevailing challenges of the RTCSM sensor network, data transmission, data processing, and personalized data management are comprehensively discussed. Furthermore, this review explores RTCSM data application for updating diverse strategies including high-fidelity soil process models, control methodologies, digital soil mapping, soil degradation, food security, and climate change mitigation. Finally, the significance of RTCSM implementation in agricultural and environmental fields is underscored through illuminating future directions and perspectives in this systematic review.

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Section: Current Status and Major Challenges Of Rtcsm Data Acquisitionmentioning

confidence: 99%

A Critical Review for Real-Time Continuous Soil Monitoring: Advantages, Challenges, and Perspectives

Fan

Wang

Funk

et al. 2022

Environ. Sci. Technol.

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“…However, these approaches are not always completely effective in removing the interference produced by residual moisture. [ 115 ] Another limitation of this technique is that ATR‐FT‐IR is not suitable for the analysis of microplastics of less than 20 µm. [ 113 ]…”

Section: Micro‐ and Nanoplastics Detection Using Raman And Sersmentioning

confidence: 99%

Latest Advances and Developments to Detection of Micro‐ and Nanoplastics Using Surface‐Enhanced Raman Spectroscopy

Vélez‐Escamilla

Contreras‐Torres

2022

Part & Part Syst Charact

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The increasing demand for single‐use plastic‐based products worldwide has generated immense waste during the last decade. This review aims to summarize the current developments of surface‐enhanced Raman spectroscopy (SERS) for detecting micro‐ and nanoplastics in a variety of samples and environments. Despite the SERS technique being very recent for this purpose, its robustness has already been discussed in a few analyses focused on well‐known pollutants such as phthalates, plasticizers, and xenobiotic contaminants from commercially available water bottles. Here, the latest advances, obstacles, and perspectives are reviewed using SERS detection as a robust alternative for analyzing complex samples containing nanoplastic particles present in daily consumer products such as wine and vegetables. Moreover, this paper describes different SERS substrates developed to overcome the limitations for identifying polymer particles at low concentrations. Factors contributing to the sensitivity of SERS substrates are discussed to show the advantages and limitations of this technique. The broader role of SERS as a tool in environmental research is currently explored from polluted air and aquatic environments, which can be relevant for other fields, such as clinical monitoring and nanotoxicology.

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“…show the diagnostic features of water vapor (note the rotational-vibrational H-O-H scissoring band centered around 1620 cm −1 ; Fig. 1, C and D ) ( 9 – 11 ). Any peaks in the region of interest cannot be differentiated from nonrandom noise.…”

mentioning

confidence: 99%

“…If the effect of water vapor was consistent across samples, then post hoc correction procedures [e.g. ( 11 )] can be used to remove interference before peak detection. However, such methods require measurements of water vapor at the time of sample collection.…”

mentioning

confidence: 99%

Comment on “Dying in the Sun: Direct evidence for elevated UV-B radiation at the end-Permian mass extinction”

Seddon,

Zimmermann

2023

Sci. Adv.

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Liu et al. present evidence of increased abundance of UV-B–absorbing compounds in fossilized sporomorphs at the end-Permian mass extinction based on Fourier transform infrared (FTIR) spectroscopy. Their approach assumes that UV-B–absorbing compounds are present in the fossilized sporomorphs spanning the extinction interval and that they can be quantified using FTIR. However, further analysis reveals that the signal that they aim to focus on is weak and poorly resolved against nonrandom background interference most likely associated with water vapor. We also show that the peak detection methods that they use are inappropriate for use on these fossil sporomorphs because their methods select only 3.9% of the spectra at the target waveband of interest. The reconstruction that they present is based on baseline variations in the spectra and cannot be confidently attributed to variations in UV-B–absorbing compounds. “Direct” evidence for UV-B radiation at the end-Permian mass extinction cannot be claimed to have been observed in this record.

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A new approach to removing interference of moisture from FTIR spectrum

Cited by 17 publications

References 45 publications

A Critical Review for Real-Time Continuous Soil Monitoring: Advantages, Challenges, and Perspectives

A Critical Review for Real-Time Continuous Soil Monitoring: Advantages, Challenges, and Perspectives

Latest Advances and Developments to Detection of Micro‐ and Nanoplastics Using Surface‐Enhanced Raman Spectroscopy

Comment on “Dying in the Sun: Direct evidence for elevated UV-B radiation at the end-Permian mass extinction”

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