Thermoanalytic Determination Method of Plant Biomass Lignin Content
The technology of plant biomass and determination method is applied in the field of detecting the lignin content of plant biomass by thermal analysis, which can solve the problems of complicated operation and complicated detection steps, and achieve the effects of reducing environmental pollution, saving experimental steps, and avoiding the use of
Inactive Publication Date: 2018-07-31
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Therefore, there is an urgent need to find a way to establish the relationship between anaerobic thermal parameters and lignin content of plant biomass by using thermogravimetric analysis and differential calorimetry scanning to solve the problems of cumbersome lignin detection steps and complicated operations.
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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 classified according to different parts such as roots, leaves, stems, etc., and they are killed at 90°C for 1 to 2 hours, and thoroughly dried 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. 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 indicators: such as figure 1 As shown, use the Universal Analysis 2000 software to open the DSC result file, and use 450°C to 500°C as the startin...
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Abstract
The invention discloses a method for thermal analysis and determination of plant biomass lignin content, which comprises the following steps: (1) preparation of plant biomass samples; (2) standard organic matter anaerobic condition slow pyrolysis characterization parameter standard; ( 3) Natural plant biomass anaerobic condition slow pyrolysis characterization parameter standard; (4) Plant biomass sample DSC scanning experiment to obtain the DSC spectrum of natural plant biomass anaerobic slow pyrolysis characterization parameter standard; (5) Interpretation of DSC spectrum to obtain thermal index; (6) Calculation of lignin. The invention saves a large number of experimental steps, effectively shortens the experimental time, avoids the use of acidifying agents, and reduces environmental pollution.
Description
technical field [0001] The invention relates to a method for measuring lignin content, in particular to a method for detecting plant biomass lignin content 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. Among them, lignin is an amorphous, aromatic polymer that widely exists in plants and contains oxyphenylpropanol or its derivatives in its molecular structure. It is one of the main components of plant tissues, accounting for about 15% to 30% of its chemical composition. [0003] At present, lignin analysis techniques mainly include Klason method, ultraviolet spectrophotometry, reversed-phase high-performance liquid chromatography, redox method, ammonolysis method, non-aqueous conductivity titration method, etc. The principle of the Klason method is to use concentr...
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IPC IPC(8): G01N25/00G01N1/28
Inventor 吴丰昌郭飞穆云松廖海清胡艳香宝白英臣钱峰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI