T/CI 110-2022 Active Group standards

T/CI 110-2022 Magnetic biochar thin film diffusion gradient technique (MB-DGT) for extracting effective trivalent and pentavalent arsenic from soil

Publish Date: 2022-11-14 Implement Date: 2022-11-14 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CI 110-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Pollution, pollution control, and protection

Publish Date: 2022-11-14

Implement Date: 2022-11-14

Scope

Scope: This document establishes the extraction method, calculation method, and technical requirements for effective trivalent and pentavalent arsenic in site soil using magnetic biochar membrane diffusion gradient technology. This document is applicable to the detection of effective trivalent and pentavalent arsenic in site soil. Main technical content: 3.1 Bioavailability: Based on the total amount of pollutants in soil, bioavailability is closely related to soil environmental conditions and the chemical form of pollutants. It refers to the amount of pollutants that can directly interact with organisms and produce responses within a certain period of time. 3.2 Diffusive Gradients in Thin Films (DGT): DGT is a novel in situ method for collecting and measuring the effective state or bioavailability of heavy metals. 3.3 Biochar: Biochar is a type of insoluble, stable, highly aromatic, and carbon-rich solid material produced by slow thermal decomposition at 700°C in an oxygen-free environment from biological residues (such as rice straw). It is mainly a black solid with a loose structure, pores, fine particles, and a light texture, mainly composed of elements such as C, H, O, and N. 3.4 Magnetic Biochar: Made by modifying biochar with magnetic materials, magnetic biochar has a larger specific surface area and more developed pore structures, making it easy to be recovered and reused by magnets. 4. Determination Procedure 4.1 Composition of the MB-DGT Device: The MB-DGT device is composed of a fixed layer (fixed membrane, Φ=25.00 mm, δ=0.40 mm) and a diffusion layer (diffusion membrane, Φ=25.00 mm, δ=0.80 mm) and a water filtration membrane (0.45 μm pore size). Target ions diffuse through the diffusion layer and are captured by the fixed membrane, forming a linear gradient distribution in the diffusion layer. 4.2 Determination of Diffusion Coefficients: The diffusion coefficient is determined using the diffusion cell method. The diffusion coefficients of trivalent and p