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A method for measuring soil soluble organic carbon isotope

An organic carbon and soluble technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of difficult and incomplete oxidation, and achieve the effects of good measurement stability, avoiding high temperature, and simplifying pretreatment procedures.

Inactive Publication Date: 2019-06-11
INST OF GENETICS & DEVELOPMENTAL BIOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

The TOC oxidation methods include wet oxidation (WO) and high temperature catalytic combustion (HTC). For the organic matter in the soil solution (mainly fulvic acid and some humic acid), wet oxidation has difficulty and incomplete oxidation. , this method has certain disadvantages

Method used

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  • A method for measuring soil soluble organic carbon isotope

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Experimental program
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Effect test

Embodiment 1

[0063] 1) Extraction of water-soluble organic carbon from soil samples: Weigh 30g of soil samples that have been naturally air-dried and passed through a 1mm sieve into a 250ml plastic bottle, add 30ml of high-purity water, that is, the water-to-soil mass ratio is 1:1, shake for 10 minutes at 25°C, and centrifuge. Take the supernatant; acidify the supernatant with 85% phosphoric acid until the pH is less than 2, then filter through a 0.45 μm water filter membrane, and collect the supernatant in a 50ml glass vial.

[0064] 2) Sample concentration: Freeze-dry the supernatant in 1); add 500 μl of high-purity water to the freeze-dried sample, vortex and oscillate to redissolve; take 100 μl of the reconstituted solution in a silver boat, and place it in an oven at 50°C for drying Dry, repeat this process 2-5 times to accumulate sample volume to meet the needs of instrument detection, and wrap the sample.

[0065] 3) EA-IRMS measurement: the sample is burned in the oxygen-rich combu...

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Abstract

The invention discloses a method for measuring a soil soluble organic carbon isotope. In the method, an EA-IRMS method is adopted. The method comprises the following steps: firstly, extracting soil water-soluble organic carbon through a multi-water to soil mass ratio method to obtain a solution containing the soil water-soluble organic carbon; then, concentrating the obtained solution through freeze drying; adding purified water into concentrated substances for re-dissolving, drying and measuring delta<13>C through EA-IRMS. The novel method for measuring the soil soluble organic carbon isotope provided by the invention is rapid and efficient, is easy and convenient to operate, and has high measuring accuracy.

Description

technical field [0001] The invention belongs to the technical field of soil soluble substance detection, and relates to the measurement of soil soluble organic carbon isotopes, in particular to a method for soil soluble organic carbon isotopes. Background technique [0002] Soil soluble organic carbon refers to the mixed carbon composed of organic matter that can dissolve in the water phase in the soil at room temperature and natural pH conditions. In experimental operation, it usually refers to water-soluble organic matter that can pass through a 0.45 μm microporous membrane. [0003] The chemical composition of soil soluble organic carbon is organic matter with different structures and molecular weights, such as low molecular weight free amino acids, carbohydrates, organic acids, etc., and large molecular weight enzymes, amino sugars, polyphenols, and humus, etc., but the main part is water-soluble Sexual organic carbon. [0004] Soil soluble organic carbon is an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 胡玉昆胡佳宏王仕琴孟俊星
Owner INST OF GENETICS & DEVELOPMENTAL BIOLOGY CHINESE ACAD OF SCI
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