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A kind of leaching method of soluble organic carbon in soil

A soluble and organic carbon technology, which is applied in the detection of soil soluble substances in agriculture and the extraction of organic carbon in soil, can solve the problems of measurement interference, bursting of TOC instrument combustion tube, etc., and achieve significant technical effects

Active Publication Date: 2017-04-19
INST OF SOIL & FERTILIZER XINJIANG ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention aims to provide a method for extracting soluble organic carbon in soil, which effectively extracts the soluble organic carbon components in soil and solves the problem of using K 2 SO 4 During leaching, K 2 SO 4 The TOC instrument combustion tube burst problem caused by too high concentration also solves the interference of salt ions in the soil with high salt content, and obtains good technical results

Method used

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  • A kind of leaching method of soluble organic carbon in soil
  • A kind of leaching method of soluble organic carbon in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one: a kind of leaching method of soluble organic carbon in soil

[0026] A specific method for leaching soluble organic carbon in soil has the following steps:

[0027] (1) Sample weighing: Weigh 10.00g of fresh sample into a 100mL bottle.

[0028] (2) Extraction: add 0.5mol / LK 2 SO 4 40 mL of the solution was placed on a shaker and oscillated at 200 r / min for 30 min, and then filtered using a 0.45 μm filter membrane through a vacuum filtration device specially provided in the present invention, and the filtrate was collected in a 50 mL centrifuge tube.

[0029](3) The vacuum filtration device used in the above steps includes a suction filter assembly with the outlet downward and a vacuum device assembly. The suction filter assembly includes a column tube (1), a funnel-shaped assembly (2) with a downward outlet and a filter medium body (3), the vacuum device includes a rubber catheter (5), a vacuum liquid storage device (6), and a test tube (7); the filte...

Embodiment 2

[0033] Embodiment two: Soil solution suction filtration device

[0034] See attached figure 1 to attach figure 2 It can be seen that the soil solution suction filtration device provided by the present invention includes a suction filter assembly and a vacuum device assembly with the outlet downward, and the suction filter assembly includes a column tube (1), a funnel-shaped assembly (2) with a downward outlet and a filter medium body ( 3), the vacuum device includes a rubber catheter (5), a vacuum liquid storage device (6), and a test tube (7). The filter medium body (3) is bonded to the upper opening of the funnel-shaped component (2). The opening at the lower end of the column tube (1) is seamlessly connected with the opening at the upper end of the funnel-shaped component (2), and is clamped by the clamp (4). There is an opening at the upper end of the column tube (1) to facilitate liquid addition. The opening of the lower end of the funnel-shaped component (2) is seaml...

Embodiment 3

[0045] Example Three: Extraction of Soluble Organic Carbon in Soil

[0046] A method for leaching soluble organic carbon in soil provided by the present invention has been operated and applied in experiments, scientific research and production practice, and the specific steps for leaching soluble organic carbon in soil are as follows.

[0047] (1) Weighing samples: Weigh 5 fresh samples of 10.00g and put them into 100mL bottles respectively.

[0048] (2) Extraction: add 0.5mol / LK respectively 2 SO 4 40 mL of the solution was placed on a shaker and oscillated at 200 r / min for 30 min, and then filtered using a 0.45 μm filter membrane through the vacuum filtration device provided by the present invention as in Example 2, and the filtrate was collected in a 50 mL centrifuge tube.

[0049] (3) Salt removal: place the filtrate in the centrifuge tube in a 4°C low-temperature refrigerator for 1 hour to analyze the salt in the filtrate, then place the centrifuge tube in a high-speed ...

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Abstract

The invention discloses a method for extracting soluble organic carbon in soil. The method comprises the following steps: weighing 10.00g of a sample, putting the sample into a 100mL bottle, adding 40mL of a 0.5mol / L K2SO4 solution, putting on an oscillator for oscillating for 30min at the speed of 200rpm, carrying out suction filtration by using a special vacuum suction filtration device, collecting filtrate in a 50mL centrifugal tube, putting the filtrate in a low-temperature refrigerator at 4 DEG C to refrigerate for 1h, so that salt in the filtrate is separated out, centrifuging for 5min at the high speed of 2500rpm, so that the salt precipitates and is layered with the filtrate, and measuring supernate in the centrifugal tube by using a TOC instrument so as to obtain the content of the soluble organic carbon in the soil. The soluble organic carbon in the soil is effectively extracted; the problem that a combustion tube of the TOC instrument is exploded due to too-high concentration during extracting by using K2SO4 is solved; simultaneously, interference of saline ions in the soil having the high salt content to measurement is also solved, and therefore, the method has good practicability.

Description

technical field [0001] The invention belongs to the technical field of soil soluble substance detection in agriculture, and more specifically, the invention relates to the technical field of organic carbon extraction in soil. Background technique [0002] Soil soluble organic carbon (Dissolved Organic Carbon, DOC) refers to various organic carbon dissolved in soil solution, including soluble sugars, hydrocarbons, polyphenolic compounds, amino acids, fatty acids, aromatic acids, humus, etc. It is well known and generally operationally defined as water-soluble organic carbon passing through a 0.45 μm microporous membrane. The determination of soil solution DOC has become an important item in the analysis of soil chemical properties. At present, the latest method commonly used in the world - total organic carbon (TOC) analyzer method. This method has the advantages of short measurement period, high sensitivity, good reproducibility, easy automatic control, and no secondary po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/40
Inventor 杨金钰许咏梅孙九胜唐光木祁通单娜娜王新勇谭新霞
Owner INST OF SOIL & FERTILIZER XINJIANG ACAD OF AGRI SCI
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