Skip to content
Research Article Open access CC BY 4.0

Spectroscopic and Kinetic Study of Sucrose Oxidation by Cr(VI) and Its Application in the Quantitative Analysis of Soil Organic Carbon

John O. Adongo, Seth Osumba, Simion Misoi, Joshua Kibet

International Research Journal of Pure and Applied Chemistry · pp. 1–15 · Published 21 Jul 2022

10.9734/irjpac/2022/v23i430467

Abstract

The percent organic carbon (%OC) is an important soil fertility measure that has important implications in agricultural productivity and food security. In this study, a UV-visible spectrophotometric technique was investigated and applied to quantify %OC from selected soil samples along a river basin that traverses agricultural farmlands, a forest and sewage treatment lagoons for a comparative survey purposes. The study was based on the measurement of absorbance of Cr(III) species that arise from oxidation of sucrose (which is 42.11% carbon) by dichromate ions which contain Cr(VI) species. The uv-visible spectrophotometric double beam wavelength scan measurements elucidated the conversion of Cr(VI) to Cr(III) ions and a calibration plot was developed with r2= 0.99. The analyte peak was identified in the region from 750 nm to 550 nm (the absorbing Cr(III) species) with a turning point maximum at 576 nm. The kinetic profile of sucrose oxidation by the dichromate ions was studied via absorbance of Cr(III) and Cr(VI) as a function of the reaction time and was used to characterize the reaction model. The absorbance of Cr(III) as a function of reaction time fitted best into the non-linear Belehradek power function equation y=a(x-b)c,, where y = absorbance; x = time(s); a, b, c = are constants (r2 of 0.91). Kinetic analysis revealed that the reaction that leads to the formation of Cr(III) during sucrose oxidation proceeds via pseudo first-order kinetics (r2= 0.83). A comparative quantitative analysis indicated that the sewage treatment lagoons had the highest %OC content at about 5.5-6.6%OC. The soils sampled from the forest regions had about 4.6-5.8%OC whereas the river bank soils had the lowest levels at about 2.0-2.5%OC. A statistical t-test analysis showed that the %OC levels in sub-soils were significantly higher than those of the top-soils (p > 0.05 at 95% CI).

UV-Vis spectroscopy kinetics sucrose oxidation organic carbon chromium(VI)

References (14)

  1. 1 Soil organic matter as sole indicator of soil degradation [DOI]
  2. 2 Soil organic carbon: The value to soil properties [DOI]
  3. 3 Applications of UV/Vis Spectroscopy in Characterization and Catalytic Activity of Noble Metal Nanoparticles Fabricated in Responsive Polymer Microgels: A Review [DOI]
  4. 4 Soil Organic Matter Research and Climate Change: Merely Re-storing Carbon Versus Restoring Soil Functions [DOI]
  5. 5 Evaluation of nutrient index using organic carbon, available P and available K concentrations as a measure of soil fertility in Varahi River basin, India
  6. 6 Vienna soil organic matter modeler 2 (VSOMM2) [DOI]
  7. 7 Monitoring of antibody-drug conjugation reactions with UV/Vis spectroscopy [DOI]
  8. 8 Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis [DOI]
  9. 9 Submersible UV-Vis Spectroscopy for Quantifying Streamwater Organic Carbon Dynamics: Implementation and Challenges before and after Forest Harvest in a Headwater Stream [DOI]
  10. 10 Development of Alternative Methods for Determining Soil Organic Matter [DOI]
  11. 11 Green Roccella phycopsis Ach. mediated silver nanoparticles: synthesis, characterization, phenolic content, antioxidant, antibacterial and anti-acetylcholinesterase capacities [DOI]
  12. 12 Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds [DOI]
  13. 13 Application of chemometric modelling to UV-Vis spectroscopy: development of simultaneous API and critical excipient assay in a liquid solution continuous flow [DOI]
  14. 14 Continuous Kinetic Sampling of Flow Polymerizations via Inline UV–Vis Spectroscopy [DOI]

Cited by 1

Black Soil Quality After 19 Years of Continuous Conservation Tillage

Chengyuan Zhang, Jianye Li, Francisco Alberto Sosa · Agronomy · 2024

Related research

Article metrics

Real usage data collected on this platform.

18

Page views

0

PDF downloads

1

Outbound clicks

1

Citations

Views over time

Views by country

Approximate, from request IP at view time — not citizenship or institution. Countries with fewer than 5 views are grouped as "Other".

Traffic sources

Referring site, by host.

Views and downloads exclude known bots/crawlers. Citations combines this platform's own DOI-resolved index with each external source's own reported total — see Cited by above for individually listed citing works. Last refreshed 0 seconds ago.