Replication Data for: ATR-FTIR Spectra of Peat, Digestate, Biochar, and Organo-Mineral Fertilizerdoi:10.48788/DVUA/CFSY4TDataverseUA2025-12-222Ostroha, Ruslan; Mija, Alice; Cibotaru, Sandu; Skydanenko, Maksym; Bataltsev, Yevhen, 2025, "Replication Data for: ATR-FTIR Spectra of Peat, Digestate, Biochar, and Organo-Mineral Fertilizer", https://doi.org/10.48788/DVUA/CFSY4T, DataverseUA, V2Replication Data for: ATR-FTIR Spectra of Peat, Digestate, Biochar, and Organo-Mineral Fertilizerdoi:10.48788/DVUA/CFSY4TOstroha, RuslanMija, AliceCibotaru, SanduSkydanenko, MaksymBataltsev, YevhenOMNIC0125U0005002025-435DataverseUAOstroha, RuslanBataltsev, Yevhen2025-12-20Agricultural SciencesEarth and Environmental SciencesFTIR spectroscopyDigestatePeatBiocharAmmonium sulfate<p>This dataset contains graphical representations (.png) of FTIR spectra for four organic and organo-mineral samples. The spectral analysis was performed to identify functional group changes during the valorization of digestate.</p> <b>List of analyzed samples:</b> <ol> <li>Peat (Reference material)</li> <li>Solid Digestate (Raw material from anaerobic digestion)</li> <li>Digestate Biochar (Pyrolyzed digestate)</li> <li>Digestate + (NH₄)₂SO₄ (Organo-mineral fertilizer enriched with ammonium sulfate)</li> </ol> <b>Methodology:</b> <p>The FTIR spectra were recorded using a Nicolet iS50 FT-IR spectrometer (Thermo Fisher Scientific, USA) equipped with a GladiATR diamond ATR accessory (PIKE Technologies, USA). Measurements were performed at a resolution of 2 cm^-1, with 32 scans, in the spectral range of 4000–600 cm^-1.</p>Spectral Data<p>The dataset consists of 4 image files (PNG format).</p> <b>File naming convention:</b> <ul> <li><code>FTIR_Sample_01_Peat.png</code> – Spectrum of peat sample.</li> <li><code>FTIR_Sample_02_Digestate.png</code> – Spectrum of raw digestate solids.</li> <li><code>FTIR_Sample_03_Digestate_Biochar.png</code> – Spectrum of biochar derived from digestate.</li> <li><code>FTIR_Sample_04_Digestate_AmmoniumSulfate.png</code> – Spectrum of digestate enriched with (NH₄)₂SO₄.</li> </ul>FTIR_Sample_01_Peat.pngATR-FTIR spectrum of peat (reference material).image/pngFTIR_Sample_02_Digestate.pngATR-FTIR spectrum of solid digestate (raw material from anaerobic digestion).image/pngFTIR_Sample_03_Digestate_Biochar.pngATR-FTIR spectrum of biochar derived from digestate pyrolysis.image/pngFTIR_Sample_04_Digestate_AmmoniumSulfate.pngATR-FTIR spectrum of digestate enriched with ammonium sulfate.image/pngREADME.txtDescription of the dataset, authors, and methodology.text/plain