Microwave-assisted combustion to produce benzene polycarboxylic acids as molecular markers for biochar identification and quantification

作     者：Bruno Glaser Marie Guenther Heike Maennicke Tobias Bromm 

作者机构：Institute of Agricultural and Nutritional SciencesSoil BiogeochemistryMartin Luther University Halle-Wittenbergvon-Seckendorff-Platz 306120 HalleGermany 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2021年第3卷第4期

页      面：407-418页

核心收录：

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0901[农学-作物学] 090301[农学-土壤学] 

基　　金：provided by Martin Luther University Halle-Wittenberg Germany 

主　　题：Biochar Black carbon Pyrogenic carbon Analysis Molecular marker Microwave-assisted combustion 

摘      要：Biochar is a promising carbon dioxide removal(CDR)technology for climate change *** procedures for its determination are lengthy,labor-intensive,and difficult to *** polycarboxylic acids(BPCA)are the most promising molecular markers for identification and quantification of biochar and its quality as they specifically represent the stable polyaromatic backbone of ***,using the BPCA method,its stability and,thus,its C sequestration potential could be used for CDR *** current BPCA method relies on a specific high-pressure digestion apparatus,which is not available around the ***,the aims of the present work were(i)to compare the conventional high-pressure nitric acid oxidation with a microwave-assisted digestion technique and optimize the oxidation conditions in such a way that previous results are comparable with future ones,and(ii)to significantly reduce the digestion time of soil samples of 8 h and to develop a suitable routine method that produces comparable and reproducible *** this purpose,soil and control sample series were prepared for different *** results were compared with the values of the conventional method both for individual samples and for the whole dataset *** ensure the representative-ness of the results,in addition to various soil samples with different properties,we included two reference materials into our data set,one without biochar(wheat flour)and a biochar *** results showed that conventional nitric acid oxidation in the BPCA determination at 170°C and 8 h can be substituted by digestion in a microwave reaction system(CEM Mars6)at 190°C and 1 *** results further showed that this condition needs to be strictly matched,because,otherwise,over-or underestimation of biochar quantity and/or quality will be the *** goal of a less time-consuming BPCA extrac-tion from soil samples was achieved by reducing the extraction t