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

Jonathan O. Adongo, Seth Osumba, Simion Misoi, J. Kibet
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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).
Cr(VI)氧化蔗糖的光谱与动力学研究及其在土壤有机碳定量分析中的应用
有机碳含量是一项重要的土壤肥力指标,对农业生产力和粮食安全具有重要意义。在这项研究中,研究了一种紫外可见分光光度法技术,并应用于从流经农田、森林和污水处理泻湖的河流流域选定的土壤样品中量化%OC,以进行比较调查。该研究是基于测量含有Cr(VI)的重铬酸盐离子氧化蔗糖(42.11%碳)所产生的Cr(III)的吸光度。紫外-可见分光光度双光束波长扫描测量表明,Cr(VI)转化为Cr(III)离子,并建立了r2= 0.99的校准图。分析物峰位于750 ~ 550 nm(吸收Cr(iii)物质)区域,拐点在576 nm处达到最大值。通过Cr(III)和Cr(VI)吸光度随反应时间的变化,研究了重铬酸盐离子氧化蔗糖的动力学分布,并对反应模型进行了表征。Cr(III)的吸光度作为反应时间的函数最符合非线性Belehradek幂函数方程y=a(x-b)c,,其中y=吸光度;X =时间(s);A, b, c =为常数(r2 = 0.91)。动力学分析表明,蔗糖氧化过程中生成Cr(III)的反应是通过准一级动力学进行的(r2= 0.83)。对比定量分析表明,污水处理潟湖的%OC含量最高,约为5.5 ~ 6.6%OC。森林土壤oc含量为4.6 ~ 5.8%,河岸土壤oc含量最低,为2.0 ~ 2.5%。统计t检验分析显示,下层土壤中%OC含量显著高于表层土壤(p > 0.05, 95% CI)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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