<sub>1</sub>H qNMR and Chemometric Analyses of Urban Wastewater

Filho, Elenilson G. Alves; Sartori, Luci; Silva, Lorena; Venâncio, Tiago; Carneiro, Renato Lajarim; Ferreira, Antônio G.

doi:10.5935/0103-5053.20150091

Cited by 2 publications

(3 citation statements)

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“…Therefore, an aromatization process might occur during biosolids digestion. These spectra appear intermediate between wastewater (Alves Filho et al, 2015) and humic acid spectra (Haumaier and Zech, 1995).…”

Section: Resultsmentioning

confidence: 96%

“…The sample extracted into D 2 O included base soluble components and some small colloidal material. Comparing 1 H NMR spectra from biosolids with spectra from wastewater (Alves Filho et al, 2015) revealed a significant decrease in the number of sharp peaks from individual small molecules in biosolids spectra. At the same time, the signal from biosolids spectra increased for a broad peak in a region between 3 and 4 ppm.…”

Section: Resultsmentioning

confidence: 99%

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Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

et al. 2018

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Zinc oxide nanoparticles (NPs) present in domestic wastewaters may accumulate in biosolids used as fertilizer. In this paper, metal complexation by typical biosolids is explored using methods from the humics literature. Uptake of Zn from NPs in the biosolids is evaluated. Finally, the kinetics of release of Zn species are reported as a function of (i) pH and (ii) the presence of strong binding ligands (e.g., ion exchange resin promoting release). The investigation revealed that (i) metal binding sites of biosolids are analogs of humic substances, (ii) ZnO NPs do not survive in the digestion environment, and (iii) any ZnO NPs dissolve to aqueous Zn2+ in <10 d. Kinetics of Zn in biosolids revealed that Zn release is a function of biosolid protonation. At pH 8, Zn is retained in the biosolids, whereas at pH 4.5, 10% of Zn is released from the biosolids. Adding a chelating resin to the system at pH 5.0 led to Zn release from the biosolids as per Noyes–Whitney kinetics, releasing 85% of the bound Zn in 360 h. Fifteen percent of Zn appeared to be irreversibly bound. Core Ideas Thorough chemical characterization of biosolids was performed. Metal binding sites of biosolids are analogs of humic substances. Release of Zn species by biosolids is a function of biosolids protonation. Added chelating agent drove Zn release from biosolids according Noyes–Whitney kinetics.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

et al. 2018

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“…Figure 1 a,b presents 1 H NMR spectra from representative genotypes from the ETC cassava harvested after nine months (Dourada) and HTC cassava (2009.1220), respectively. In addition, Table S1 describes structures, 1 H and 13 C chemical shifts ( δ ), multiplicity, correlations, coupling constants ( J in Hz), and references of the correspondent compounds [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

NMR-Based Metabolomic Approach for Evaluation of the Harvesting Time and Cooking Characteristics of Different Cassava Genotypes

Silva

Filho

Martins

et al. 2022

Foods

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Cassava is an important staple food for low-income countries. However, its cooking characteristics are especially affected by genotype. In this study, two groups of genotypes, namely hard to cook (HTC) and easy to cook (ETC), were harvested at different times (9 and 15 months), and evaluated by NMR coupled to chemometrics. Additionally, lignin of these materials was studied by 1H-13C HSQC NMR. The carbohydrates were the most important class of compounds to differentiate the cassava genotypes. The correlation of NMR with cooking time and starch content showed that the higher content of primary metabolites, mostly glucose, can be associated with longer cooking times and reduction of starch, corroborating the metabolic pathways analysis. Furthermore, it was observed that the lignin from cell walls did not differentiate the cooking performance of the genotypes.

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₁H qNMR and Chemometric Analyses of Urban Wastewater

Cited by 2 publications

References 1 publication

Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

NMR-Based Metabolomic Approach for Evaluation of the Harvesting Time and Cooking Characteristics of Different Cassava Genotypes

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1H qNMR and Chemometric Analyses of Urban Wastewater

Cited by 2 publications

References 1 publication

Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

Fate of Zinc Oxide Nanoparticles in a Biosolid Slurry Characterized for Metal Complexation Characteristics

NMR-Based Metabolomic Approach for Evaluation of the Harvesting Time and Cooking Characteristics of Different Cassava Genotypes

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₁H qNMR and Chemometric Analyses of Urban Wastewater