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Laser-induced breakdown spectroscopy for soil phosphorus determination

PhD defence, Friday 8 January 2021. Sara Sanchez Esteva

2021.01.08 | Helle Mitzi Thomsen Reichl

Sara Sanchez Esteva

Standard soil phosphorus (P) tests are routinely employed to estimate the size of the agronomically or environmentally relevant soil P pools. They are labor-intensive wet chemical analyses that often involve the use of harmful chemicals and cannot assess the P variability at high spatial resolution. Laser-induced breakdown spectroscopy (LIBS) is a potential alternative to standard wet chemistry methods for soil P determination since it offers several advantages but an accurate determination had proved difficult when the technique was applied to a heterogeneous set of soil samples, due to matrix effects. In her PhD studies, Sara Sánchez focused on obtaining in–depth knowledge of the possible sources of matrix effects and on exploring whether a combination of LIBS and a complementary technique, in this case visible and near-infrared spectroscopy, could improve soil P determinations with the use of several chemometric tools.

The new research findings contribute to the understanding of LIBS as an alternative analytical method for fast and accurate quantitative soil P determination.

The PhD study was completed at the Department of Agroecology, Faculty of Technical Sciences, Aarhus University.

This summary was prepared by the PhD student.



Time: Friday, 8 January 2021 at 10:00
Place: The PhD defence will be held online. To receive a link to the event, please send an e-mail to Karina Rysholt Christensen; kch@agro.au.dk
Title of PhD thesis: Exploring Laser-Induced Breakdown Spectroscopy for Phosphorus Determination in Agricultural Soils from Denmark

Contact information: Sara Sánchez Esteva, e-mail: sse@agro.au.dk.

Members of the assessment committee:

Professor Emmanuel Frossard, Department of Environmental Systems Science, Institut für Agrarwissenschaften, Switzerland

Professor Bruno Bousquet, CELIA – UMR 5107, Université de Bordeaux, France

Senior researcher Chris Kjeldsen (chairman), Department of Agroecology, Aarhus University, Denmark

Main supervisor:
Associate professor Goswin Heckrath, Department of Agroecology, Aarhus University, Denmark

Co-supervisor:

Associate professor Gitte Holton Rubaek, Department of Agroecology, Aarhus University, Denmark

Researcher Maria Knadel, Department of Agroecology, Aarhus University, Denmark

Language: The PhD dissertation will be defended in English

The defence is public.
Due to the coronavirus situation, the PhD thesis will not be available for reading at the offices of the PhD administration. Instead, interested parties may send an e-mail to gradschool.tech@au.dk to receive a digital copy of the PhD thesis. Please note, it may in certain cases be necessary to make an individual arrangement to read the PhD thesis.

Standard soil phosphorus (P) tests are routinely employed to estimate the size of the agronomically or environmentally relevant soil P pools. They are labor-intensive wet chemical analyses that often involve the use of harmful chemicals and cannot assess the P variability at high spatial resolution. Laser-induced breakdown spectroscopy (LIBS) is a potential alternative to standard wet chemistry methods for soil P determination since it offers several advantages but an accurate determination had proved difficult when the technique was applied to a heterogeneous set of soil samples, due to matrix effects. In her PhD studies, Sara Sánchez focused on obtaining in–depth knowledge of the possible sources of matrix effects and on exploring whether a combination of LIBS and a complementary technique, in this case visible and near-infrared spectroscopy, could improve soil P determinations with the use of several chemometric tools.

The new research findings contribute to the understanding of LIBS as an alternative analytical method for fast and accurate quantitative soil P determination.

The PhD study was completed at the Department of Agroecology, Faculty of Technical Sciences, Aarhus University.

This summary was prepared by the PhD student.



PhD defence
17427 / i43