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Method for detecting plant biomass TOC through thermal analysis

A technology of plant biomass and thermal analysis, applied in the field of detection of plant biomass TOC, can solve the problem of high experimental cost, achieve the effects of saving experimental steps, avoiding unnecessary use, and shortening experimental time

Inactive Publication Date: 2015-11-18
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

Although the experimental results of this method are more accurate, due to the traditional operation of measuring TOC of plant solid samples, the samples need to be pretreated such as acidification and aeration, and the acidification step needs to consume a certain amount of hydrochloric acid and other chemicals, and the operation steps such as standing still need 6-12 hours. Hours, after removing the inorganic carbon, the solid sample still needs to be dried before the measurement can be carried out, and the experimental cost is relatively high when testing a large number of samples

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  • Method for detecting plant biomass TOC through thermal analysis

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Embodiment 1

[0021] 1. Preparation of plant biomass samples: the analysis objects are pretreated plant samples (which can be divided into 4 categories: emergent plants, submerged plants, floating plants and terrestrial plants), that is, the collected plant samples are divided into Classify different parts such as leaves, stems, etc., fix them at 90°C for 1-2 hours, and dry them thoroughly at 60°C for 12 hours. After drying, they are ground and passed through a 1mm sieve, and then sealed and stored in a cool and dry place.

[0022] 2. DSC scanning experiment of plant biomass samples: 10 mg of pretreated plant samples were placed in a standard aluminum pan, and thermal analysis was performed by a differential calorimetry scanner (DSC) to obtain a DSC spectrum.

[0023] 3. Interpretation of DSC spectrum to obtain thermal index: use UniversalAnalysis2000 software to open the DSC result file, take 130°C-210°C as the starting point and end point, integrate peakF2 to obtain the peak area and the e...

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Abstract

The invention discloses a method for detecting the plant biomass TOC through thermal analysis. The method is characterized by including the following steps that firstly, plant biomass samples are prepared; secondly, a standard organic substance anaerobic condition slow pyrolysis characterization parameter standard is conducted; thirdly, a natural plane biomass anaerobic condition slow pyrolysis characterization parameter standard is conducted; fourthly, a plant biomass sample DSC scanning experiment is conducted, and a DSC thermogram of the natural plane biomass anaerobic condition slow pyrolysis characterization parameter standard is obtained; fifthly, interpretation of the DSC thermogram is conducted, and a thermal index is obtained; sixthly, TOC calculation is conducted. According to the method, a large amount of experiment steps are omitted, the experiment time is shortened by 5-11 hours, the use of acidized medicament is avoided, and environment pollution is relieved.

Description

technical field [0001] The invention relates to a method for detecting TOC of plant biomass, in particular to a method for detecting TOC of plant biomass by thermal analysis. Background technique [0002] Plant biomass is an important component of the surface environment and the main source of natural organic matter. However, its chemical composition is relatively complex and its characterization is difficult. Currently, thermal analysis is a simple, fast and reliable analytical technique for characterizing organic matter due to simple sample pretreatment and short experiment time. In recent years, thermogravimetric analysis (TGA) and differential calorimetry scanning (DSC) have been widely used in the stability of organic carbon. Studies have shown that thermal analysis indicators are sensitive to different land use patterns, different farming methods, and even forest fires; at the same time, more in-depth quantitative research provides a theoretical basis for thermal anal...

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Application Information

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IPC IPC(8): G01N25/48
Inventor 郭飞吴丰昌胡艳廖海清孙福红穆云松白英臣苏海磊
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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