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Ba-Haddou H, Hassoun H, Foudeil S, El Bakkali A, Ait Lyazidi S, Haddad M, Masson M, Coquery M, Margoum C. Combination of 3D Fluorescence/PARAFAC and UV-Vis Absorption for the Characterization of Agricultural Soils from Morocco. J Fluoresc 2022; 32:2141-2149. [PMID: 35948854 DOI: 10.1007/s10895-022-03011-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/03/2022] [Indexed: 10/15/2022]
Abstract
The present study, combining UV-Visible absorption and 3D fluorescence supported by PARAFAC chemometric analysis, focused on the characterization of soil water extractable organic matter (WEOM) in the zone of Doukkala located near the Atlantic coast of Morocco. The extracts, in water, of a set of 30 samples covering the four main types of agricultural soils in the region (commonly labeled Tirs, Faid, Hamri and R'mel) were investigated. [Formula: see text] and [Formula: see text] absorbance ratios [Formula: see text] and [Formula: see text] spectral slopes, along with their ratios[Formula: see text], as well as the fluorescence [Formula: see text] and humification [Formula: see text] indices were calculated and interpreted. In the four soil types, these parameters revealed, on the one hand, organic materials of terrigenous origin with some biological component, and showed, on the other hand, that these materials are in similar stages of humification with an important humic character. In all the soils investigated, 3D fluorescence crossed with PARAFAC chemometrics highlighted the absence of any protein component and revealed the prevalence of the fulvic acids fraction in the organic matter humic material.
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Affiliation(s)
- Hassan Ba-Haddou
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco.,INRAE, UR Riverly, 69625, Villeurbanne, France
| | - Hicham Hassoun
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco
| | - Salim Foudeil
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco
| | - Abdelmajid El Bakkali
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco
| | - Saadia Ait Lyazidi
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco.
| | - Mustapha Haddad
- Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco
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Cadondon JG, Ong PMB, Vallar EA, Shiina T, Galvez MCD. Chlorophyll-a Pigment Measurement of Spirulina in Algal Growth Monitoring Using Portable Pulsed LED Fluorescence Lidar System. SENSORS 2022; 22:s22082940. [PMID: 35458924 PMCID: PMC9025811 DOI: 10.3390/s22082940] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/02/2022] [Accepted: 04/05/2022] [Indexed: 12/10/2022]
Abstract
Chlorophyll-a measurement is important in algal growth and water quality monitoring in natural waters. A portable pulsed LED fluorescence lidar system based on the preliminary algal organic matter and pigments excitation–emission matrix (EEM) of commercialized AZTEC Spirulina powder at varying concentrations was developed. Fluorescence peaks from EEMs showed increasing intensity as the Spirulina concentration increases. Using this information, an LED fluorescence lidar with a wavelength of 385 nm, pulse width of 10 ns, and repetition frequency of 500 kHz was constructed for chlorophyll detection at 680 nm. Turbidity measurements were also conducted at 700 nm emission wavelength at the same excitation wavelength. Range-resolved fluorescence lidar signals from the portable pulsed LED fluorescence lidar system are highly correlated with the standard methods such as optical density at 680 nm (R2 = 0.87), EEM fluorescence chlorophyll-a pigment at 680 nm (R2 = 0.89), and corrected chlorophyll-a concentration (R2 =0.92). The F680/F700 lidar ratio was measured to provide a linear relationship of chlorophyll-a and turbidity in waters. The F680/F700 measurement showed strong correlations with Spirulina concentration (R2 = 0.94), absorbance at 680 nm (R2 = 0.84), EEM chlorophyll-a pigment at 680 nm (R2 = 0.83), and corrected chlorophyll-a concentration (R2 = 0.86). Results revealed that this new technique of chlorophyll-a measurement can be used as an alternative to other standard methods in algal growth monitoring.
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Affiliation(s)
- Jumar G. Cadondon
- Environment And RemoTe sensing researcH (EARTH) Laboratory, Physics Department, College of Science, De La Salle University Manila, 1004 Taft Avenue, Manila 0922, Philippines; (P.M.B.O.); (E.A.V.); (M.C.D.G.)
- Division of Physical Sciences and Mathematics, College of Arts and Sciences, Miagao Campus, University of the Philippines Visayas, Miagao 5023, Philippines
- Correspondence:
| | - Prane Mariel B. Ong
- Environment And RemoTe sensing researcH (EARTH) Laboratory, Physics Department, College of Science, De La Salle University Manila, 1004 Taft Avenue, Manila 0922, Philippines; (P.M.B.O.); (E.A.V.); (M.C.D.G.)
| | - Edgar A. Vallar
- Environment And RemoTe sensing researcH (EARTH) Laboratory, Physics Department, College of Science, De La Salle University Manila, 1004 Taft Avenue, Manila 0922, Philippines; (P.M.B.O.); (E.A.V.); (M.C.D.G.)
| | - Tatsuo Shiina
- Graduate School of Engineering, Chiba University, Yayoi-cho, Chiba 263-8522, Japan;
| | - Maria Cecilia D. Galvez
- Environment And RemoTe sensing researcH (EARTH) Laboratory, Physics Department, College of Science, De La Salle University Manila, 1004 Taft Avenue, Manila 0922, Philippines; (P.M.B.O.); (E.A.V.); (M.C.D.G.)
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