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Detection of Biochar Carbon by Fluorescence and Near-Infrared-Based Chemometrics

文献类型： 外文期刊

作者： Uchimiya, Minori 1 ; Franzluebbers, Alan J. 2 ; Liu, Zhongzhen 1 ; Lamb, Marshall C. 4 ; Sorensen, Ronald B. 4 ;

作者机构： 1.USDA ARS, Southern Reg Res Ctr, 1100 Robert E Lee Blvd, New Orleans, LA 70124 USA

2.USDA ARS, Plant Sci Res Unit, 3218 Williams Hall,NCSU Campus,Box 7620, Raleigh, NC 27695 USA

3.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou, Guangdong, Peoples R China

4.USDA ARS, Natl Peanut Res Lab, 1011 Forrester Dr SE, Dawson, GA 39842 USA

关键词： Thermochemical conversion; Biomass; Black carbon; Clay; Humic substance

期刊名称：AQUATIC GEOCHEMISTRY （ 影响因子：1.517； 五年影响因子：1.755 ）

ISSN： 1380-6165

年卷期： 2018 年 24 卷 5-6 期

页码：

收录情况： SCI

摘要： Large-scale biochar field trials have been conducted worldwide to test for carbon negative strategy in the event of carbon credit and if other subsidies become enacted in the future. Once amended to the soil, biochar engages in complex organo-mineral interactions, fragmentation, transport, and other aging mechanisms exhibiting interactions with treatments including the irrigation and fertilizer application. As a result, quantitative tracing of biochar carbon relying on the routinely measured soil parameters, e.g., total/particulate organic carbon, poses a significant analytical uncertainty. This study utilized two biochar field trial sites to calibrate for the biochar carbon structure and quantity based on the infrared- and fluorescence-based chemometrics: (1) slow pyrolysis biochar pellets on kaolinitic Greenville fine sandy loam in Georgia and (2) fast pyrolysis biochar powder on Crider silt loam in Kentucky. Partial least squares-based calibration was constructed to predict the amount of solvent (toluene/methanol)-extractable fluorescence fingerprint (290/350nm excitation and emission peak) attributed to biochar based on the comparison with the authentic standard. Near-infrared-based detection was sensitive to the C-H and C-C bands, as a function of biochar loading and the particulate organic carbon content (<53 m) of the bulk soil. Developed chemometrics could be used to validate tarry carbon structures intrinsic to biochar additives, as the impact of biochar additives on soil chemical properties (pH, electric conductivity, and dissolved organic carbon) becomes attenuated over time.

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