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Pretreatment method for carbon-nitrogen stable carbon isotope assay of liquid sample

A technology for stabilizing carbon isotopes and liquid samples, which is applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of insufficient sample concentration, large error of detection results, and undetectable results, etc., and achieve water absorption effect Good, cheap results

Inactive Publication Date: 2015-04-01
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem in the existing detection method that the error of the detection result is large or even undetectable due to the lack of sample concentration in the existing detection method, and provides a pretreatment method for the determination of carbon and nitrogen stable carbon isotopes in liquid samples

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  • Pretreatment method for carbon-nitrogen stable carbon isotope assay of liquid sample
  • Pretreatment method for carbon-nitrogen stable carbon isotope assay of liquid sample
  • Pretreatment method for carbon-nitrogen stable carbon isotope assay of liquid sample

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specific Embodiment approach 1

[0013] Specific embodiment one: a kind of liquid sample carbon nitrogen stable carbon isotope determination pretreatment method of this embodiment is carried out according to the following steps:

[0014] 1. Preparation of zeolite powder: Weigh zeolite and add it into a porcelain crucible, then place the porcelain crucible in a muffle furnace, and heat at a temperature of 900-1000°C for 3.5h-4.5h to obtain zeolite powder;

[0015] 2. Preparation of the liquid sample to be tested: add 0.8mg to 1.2mg of the zeolite powder obtained in step 1 into a tin cup, then use a syringe to take 1μL to 10μL of the solution to be tested and add it to the tin cup containing the zeolite powder. The tin cup is wrapped into a solid cylinder to obtain the liquid sample to be tested;

[0016] 3. Detection: put the liquid sample to be tested in step 2 into the EA-IRMS for testing, and obtain the stable isotope value of carbon and nitrogen in the liquid sample.

[0017] The purpose of step 1 of this...

specific Embodiment approach 2

[0022] Embodiment 2: This embodiment is different from Embodiment 1 in that the zeolite described in step 1 is 180-220 mesh zeolite. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the zeolite described in step 1 is 200 mesh zeolite. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a pretreatment method for carbon-nitrogen stable carbon isotope assay of a liquid sample, belongs to the technical field of sample pretreatment, and aims at solving the problem in a conventional detection method that the errors of the detection result is large or even the result cannot be obtained as the required sampling concentration cannot be reached. The pretreatment method comprises the following steps: I, preparing zeolite powder, II, preparing a liquid sample to be detected; and III, detecting. By adopting the pretreatment method, the requirement on the concentration of carbon-nitrogen is reduced by 10 times when compared with that of a standard automatic liquid sampler feeding method, and the requirement on the size of a sample to be detected is also reduced by 50 times; secondly, zeolite as an additive is a porous silica-alumina mixed oxide which is very low in price and very good in water absorption effect, most importantly the carbon-nitrogen carbon stable isotope assay result is not affected by zeolite, and the steps are simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of sample pretreatment, and in particular relates to a pretreatment method for measuring carbon and nitrogen stable carbon isotopes of liquid samples. Background technique [0002] Stable isotope ratio mass spectrometers are widely used in ecology, environment, soil, hydrology and other related fields. For example: using 13 C-isotope-labeled soybean plants, after the soybeans mature, the plant residues are decomposed by soil microorganisms, and the calibration 13 Soybean leaves, stems and roots after C were subjected to a decomposition process test, by detecting the 13 C content, comparing the difference in soil organic carbon components before and after adding exogenous organic carbon (soybean residues) to the soil, and according to 13 Quantitative distribution of C among components, analyze the (positive, negative or none) effect of exogenous carbon on the transformation of soil intrinsic organic carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N27/62
Inventor 张少庆王国平张玉霞
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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