Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

In-situ biochar-soil mineral composite sample collection method

A technology for sample collection and biochar, which is applied in the fields of biochemical equipment and methods, biofuels, and sample preparation for testing, etc. The effect of small workload and simple preparation method

Active Publication Date: 2020-12-08
YANCHENG INST OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manual separation method requires manual screening, and the particles of biochar and soil are small, so the method is inefficient and requires a lot of work; the steps of the chemical separation method are complicated and cumbersome, especially some chemical substances may kill some microorganisms and change the quality of biochar. Some properties affect the accuracy of the experimental results. For example, if the chemical separation method is used to separate, acid will be used for pretreatment, which will damage the carbonate in the soil and affect the experimental results.
Currently commonly used density separation media include tetrabromoethane, diiodomethane diluted with triethyl orthophosphate, and sodium polytungstate. Different density solutions need to be configured, and Basile-Doelsch et al. adopt the density separation method (preparation of 1700-2600kg / m 3 Wait for 10 different density grades of sodium polytungstate to achieve precise separation) to extract the density of the soil near the volcano is greater than 1900kg / m 3 According to this, the influence of minerals on the fixation of carbon in the soil near the volcano was proved; Kramer et al. studied the influence of high content of C and N in sodium polytungstate on the chemical properties of soil density separation, and the results showed that: when When the content of C and N in sodium polytungstate is lower than 0.06mg / g, it will not pollute the soil density separation; when it is higher than 0.06mg / g, it is recommended to use traditional testing methods to detect possible pollution effects; when It cannot be used when the C / N content is greater than 0.5mg / g; sodium polytungstate also has its limitations: 1) It is necessary to prepare a variety of different high-concentration solutions, which requires a large workload and high cost; 2) the experimental process is prone to pollution, The result is not accurate enough

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • In-situ biochar-soil mineral composite sample collection method
  • In-situ biochar-soil mineral composite sample collection method
  • In-situ biochar-soil mineral composite sample collection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 prepares carbon film

[0022] The fired wheat straw charcoal (for the preparation method of biochar, please refer to the literature "Bao Lei et al., Research progress in the preparation and application of biochar materials, new chemical materials [J], 2019, 47(7): 54-59") Grind and pulverize evenly in a mortar, grind and pulverize, and pass through a 280-mesh sieve to obtain wheat straw biochar powder (hereinafter referred to as "charcoal powder").

[0023] Take 0.2g of charcoal powder and add 100 μL of 2% binder PVDF and 200 μL of solvent N-methylpyrrolidone into a mortar, mix to obtain a viscous coating, and spread the coating evenly on a surface 12 cm long and wide One side surface of 6cm graphite paper (base); after smearing, put the graphite paper in an oven at 85°C to dry for 1 hour, then put the graphite paper in an oven at 120°C to dry for 3 hours, take it out and cool to room temperature, After the paint dries, a coating is formed on the surface o...

Embodiment 2

[0029] Embodiment 2 Soil in-situ test

[0030] The present embodiment adopts the soil in-situ collection method, and the specific operation steps are as follows: dig a small rectangular ditch with a shovel or shovel according to the placement depth of the carbon film (slightly larger than the carbon film, if the burial depth exceeds the height of the carbon film, it can be placed in the soil layer surface markings).

[0031] Insert the prepared carbon film vertically into the natural soil in the field, and at the same time ensure that the surface of the carbon film coating is in full contact with the soil. The soil must completely cover the surface of the carbon film so that the carbon film on the graphite paper is completely covered by the soil. The distance between each carbon film is about 10cm (such as figure 2 shown).

[0032] At installations 15d and 30d, the carbon film was carefully removed by digging a pit near the carbon film while pushing it sideways without rota...

Embodiment 3

[0048] Embodiment 3 binding agent screening test

[0049] In this example, the binder phenolic resin PF is used instead of the PVDF used in Example 1 to prepare a pure carbon-carbon membrane, and the rest of the preparation steps are the same as in Example 1.

[0050] Detect the bond strength of coating and graphite paper after 15 days and 30 days respectively, and the method of bond strength detection can be found in literature (Zhang Feng et al. 2017, Influence of composition and heat treatment temperature on the bond performance of phenolic resin-based binder, Journal of Ceramics [ J], 38(5), 688-691). Test results such as image 3 shown.

[0051] Depend on image 3 It can be seen that with the prolongation of time, the bond strength of phenolic resin PF decreases, and a small part of carbon particles fall off after 30 days, which is not suitable for long-term field testing, while PVDF has strong adhesion and can prevent carbon particles for a long time. Grains fall off...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
coating thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses an in-situ biochar-soil mineral composite sample collection method, relates to the technical field of agricultural soil improvement and remediation, and aims to solve the technical problems that in-situ tracking and analysis of soil quality applied to an existing biochar farmland are inconvenient, biochar soil mineral composite ex-situ separation is difficult and the like.The method comprises the following steps: preparing a graphite paper-loaded biochar film, putting the graphite paper-loaded biochar film into soil, compounding biochar and soil minerals in a natural soil ecosystem, taking out the biochar film after a short time or a long time, and unloading the biochar film to obtain an in-situ sample without any treatment, thereby being used for subsequent characterization. The method is simple, the field environment charcoal effect can be simulated rapidly and accurately, and convenience is provided for visually displaying the spatial heterogeneity of the field environment charcoal effect.

Description

technical field [0001] The application relates to the field of biochar, in particular to an in-situ biochar-soil mineral composite sample collection method. Background technique [0002] At present, the overall situation of my country's soil environment is worrying, especially the problem of farmland soil pollution has attracted widespread attention from all walks of life, and the pollution of farmland in some areas has become very serious. Scholars and researchers have proposed a variety of soil restoration and treatment programs, such as in-situ restoration, Ex-situ restoration, thermal restoration, application of soil amendments, etc. Among them, biomass charcoal is a solid material formed by pyrolysis of biomass under high temperature, low oxygen or anaerobic conditions. It has a developed pore structure, a relatively large surface area, and has dual characteristics of hydrophilic and hydrophobic. There are various functional groups on the surface. A large number of posi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N19/04G01N1/28G01N1/12G01N1/04C12Q1/06
CPCG01N33/24G01N19/04G01N1/28G01N1/286G01N1/12G01N1/04C12Q1/06G01N2001/2866Y02E50/10
Inventor 严金龙全桂香王慧崔立强
Owner YANCHENG INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com