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A Novel Strategy to Evaluate the Aromaticity Degree of Natural Organic Matter Based on Oxidization-Induced Chemiluminescence.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-03-02 , DOI: 10.1021/acs.est.9b07499
Jitao Lv 1 , Ruixia Han 1, 2 , Lei Luo 1 , Xiangyun Zhang 3 , Shuzhen Zhang 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-03-02 , DOI: 10.1021/acs.est.9b07499
Jitao Lv 1 , Ruixia Han 1, 2 , Lei Luo 1 , Xiangyun Zhang 3 , Shuzhen Zhang 1, 2
Affiliation
Due to its complex composition and structure, many of the properties of natural organic matter (NOM) are poorly understood. In this study, the oxidization-induced chemiluminescence (OCL) of NOM was investigated, and a flow-injection OCL method was developed using alkaline persulfate-H2O2 as oxidizing agent. The method is suitable for the direct analysis of NOM in both homogeneous and heterogeneous samples without isolation or concentration. A strong linear relationship (p < 0.001) was found between the normalized organic carbon OCL (OCLOC) and the percentage of aromatic carbon in standard NOM and soil samples, suggesting that OCLOC can be used as an empirical indicator to assess the aromaticity degree of NOM in both homogeneous and heterogeneous samples. By using this method, the percentages of aromatic carbon in a forest soil profile with low organic carbon content were estimated, and a decrease in the degree of aromaticity in deeper soil was observed. Considering the high sensitivity (lower than 0.1 mgC L-1) and throughput (13 s per detection), and low sample consumption (less than 1 mg) of the method, the proposed OCLOC indicator shows great promise for the high-throughput evaluation of the aromaticity degree of NOM for a wide variety of environmental and geochemical samples.
中文翻译:
一种基于氧化诱导化学发光的天然有机物芳香度评估新策略。
由于其复杂的组成和结构,人们对天然有机物(NOM)的许多特性知之甚少。在这项研究中,对NOM的氧化诱导化学发光(OCL)进行了研究,并开发了一种使用碱性过硫酸盐-H2O2作为氧化剂的流动注射OCL方法。该方法适用于直接分析均质和异质样品中的NOM,而无需分离或浓缩。在标准NOM和土壤样品中,归一化有机碳OCL(OCLOC)与芳烃百分比之间存在很强的线性关系(p <0.001),这表明OCLOC可作为评估NOM芳香度的经验指标。在均质和异质样品中均如此。通过使用这种方法,估算了有机碳含量低的森林土壤剖面中芳香碳的百分比,并观察到深层土壤芳香度降低。考虑到该方法的高灵敏度(低于0.1 mgC L-1)和通量(每次检测13 s),以及样品消耗低(低于1 mg),建议的OCLOC指标显示出对高通量色谱柱评估的巨大希望。 NOM在各种环境和地球化学样品中的芳香度。
更新日期:2020-03-10
中文翻译:
一种基于氧化诱导化学发光的天然有机物芳香度评估新策略。
由于其复杂的组成和结构,人们对天然有机物(NOM)的许多特性知之甚少。在这项研究中,对NOM的氧化诱导化学发光(OCL)进行了研究,并开发了一种使用碱性过硫酸盐-H2O2作为氧化剂的流动注射OCL方法。该方法适用于直接分析均质和异质样品中的NOM,而无需分离或浓缩。在标准NOM和土壤样品中,归一化有机碳OCL(OCLOC)与芳烃百分比之间存在很强的线性关系(p <0.001),这表明OCLOC可作为评估NOM芳香度的经验指标。在均质和异质样品中均如此。通过使用这种方法,估算了有机碳含量低的森林土壤剖面中芳香碳的百分比,并观察到深层土壤芳香度降低。考虑到该方法的高灵敏度(低于0.1 mgC L-1)和通量(每次检测13 s),以及样品消耗低(低于1 mg),建议的OCLOC指标显示出对高通量色谱柱评估的巨大希望。 NOM在各种环境和地球化学样品中的芳香度。