Method for detecting organic carbon-water distribution coefficient of aromatic hydrocarbon in actual soil

A technology of distribution coefficient and organic carbon, which is applied in the field of environmental risk assessment and measurement, can solve the problems of unsuitable highly hydrophobic organic compounds, underestimation of Koc value, and large model fluctuations, etc., and achieves simple and easy calculation methods, direct methods, and easy access Effect

Pending Publication Date: 2019-02-22
北京市生态环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of large fluctuations between different models, poor reproducibility and inapplicability to highly hydrophobic organic compounds in the method of establishing the Kow-Koc correlation model to calculate the Koc value, and the traditional method based on measuring soil liquid phase The actual measurement method of the total concentration in the soil is greatly affected by the dissolved organic matter in the soil, which leads to the obvious underestimation of the Koc value, and a method for determining the organic carbon-water partition coefficient of aromatic hydrocarbons in the actual soil is proposed.

Method used

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  • Method for detecting organic carbon-water distribution coefficient of aromatic hydrocarbon in actual soil
  • Method for detecting organic carbon-water distribution coefficient of aromatic hydrocarbon in actual soil
  • Method for detecting organic carbon-water distribution coefficient of aromatic hydrocarbon in actual soil

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Embodiment 1

[0037] Embodiment 1: a method for measuring the organic carbon-water partition coefficient of aromatic hydrocarbons in actual soil, comprising the following steps:

[0038] S1. Collect the soil polluted by aromatic hydrocarbons, put the contaminated soil sample in a cool place to air dry, remove impurities such as plant roots and gravel, crush it and pass it through a 100-200 mesh sieve, put it in a ziplock bag and place it at 4 °C Store in dark environment;

[0039] S2. Weighing a certain amount of contaminated soil treated in S1, and measuring the concentration of aromatic hydrocarbons (Cs) in the soil;

[0040] S3. Weighing a certain amount of contaminated soil treated in S1, and measuring the soil organic carbon content (foc);

[0041] S4. Take out the disposable polydimethylsiloxane fiber (passive sampler) and cut it into 2-5cm long fiber segments. Soak the fiber segment in methanol solution for 24-25h. Ultrasonic cleaning with deionized water 2-3 times, 10-20min each t...

Embodiment 2

[0061] Embodiment 2: Based on Embodiment 1, the difference is that the soil polluted by phenanthrene is collected, and the contaminated soil sample is placed in a cool place for air-drying and crushing. After crushing, it is passed through a 150-mesh sieve for subsequent use. After the polluted soil, measure the concentration of phenanthrene in the soil (Cs) and the content of phenanthrene organic carbon in the soil (foc), take out the disposable polydimethylsiloxane fiber (passive sampler), and cut into 3cm long fiber segments , soak the fiber segment in methanol solution for 24 hours, after soaking, ultrasonically clean it with sterilized deionized water for 3 times, each time for 15 minutes, dry it for later use, use a 25mL brown chromatographic bottle as the reaction vessel, and weigh 5g of it for treatment The final contaminated soil is placed in the reaction container, and an appropriate amount of sterilized deionized water is added according to the solid-liquid ratio of ...

Embodiment 3

[0063] Embodiment 3: Based on Examples 1 and 2, the difference is that the soil polluted by benzo(a)anthracene is collected, and the contaminated soil sample is air-dried and pulverized, and then passed through a 100-mesh sieve for subsequent use. Amount of contaminated soil after treatment, measure the concentration (Cs) of benzo(a) anthracene in the soil and the organic carbon content (foc) of benzo(a) anthracene in the soil, take out the disposable polydimethylsiloxane fiber ( Passive sampler), and cut into 2cm fiber segments, soak the fiber segments in methanol solution for 24h, after soaking, use sterilized deionized water to ultrasonically clean twice, each time for 10min, dry and set aside, use 20mL The brown chromatographic bottle was used as the reaction vessel, and 2g of the treated contaminated soil was weighed and placed in the reaction vessel, and an appropriate amount of sterilized deionized water was added according to the solid-to-liquid ratio of 1:3 to form a s...

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Abstract

The invention discloses a method for detecting an organic carbon-water distribution coefficient of aromatic hydrocarbon in actual soil and belongs to the technical field of environmental risk evaluation and measurement. The method for detecting the organic carbon-water distribution coefficient of the aromatic hydrocarbon in the actual soil specifically comprises the steps of detecting the concentration (C1) of an aromatic hydrocarbon compound absorbed to a passive sampler adsorbing material in an equilibrium state to predicate a freely dissolved concentration (Cfree) in a soil liquid phase onthe basis of an equilibrium distribution theory and combining the concentration (Cs) in the soil and an organic carbon content (foc) in the soil to calculate a Koc value. The method for detecting theorganic carbon-water distribution coefficient of the aromatic hydrocarbon in the actual soil, disclosed by the invention, has the advantages that the sensitivity is high; the operation is simple; requirements on data information are relatively low; the applicability is good; problems that the fluctuations among different models are great, the reproducibility is poor and the Kow-Koc correlation model method is not suitable for high hydrophobic organic compounds by using the Kow-Koc correlation model method are solved; problems that the influences of dissolved organic matters in the soil on a traditional actual detecting method are great and the Koc value can be obviously undervalued are solved; and the method is of great significance to objectively evaluate migration and transformation of the aromatic hydrocarbon compound in the soil and harms of the aromatic hydrocarbon compound to physical health.

Description

technical field [0001] The invention relates to the technical field of environmental risk assessment and measurement, in particular to a method for measuring the organic carbon-water partition coefficient of aromatic hydrocarbons in actual soil. Background technique [0002] Aromatic hydrocarbons usually refer to hydrocarbons containing a benzene ring structure in the molecule, such as benzene series, polycyclic aromatic hydrocarbons, etc. These compounds have low water solubility, high hydrophobicity, and generally have environmental persistence and high toxicity. Harmful to the environment and human health, it is currently the most important type of environmental pollutants. Soil is a complex environmental system composed of solid, liquid, and gas phases. After entering the soil system, organic compounds are distributed among the three phases of solid, liquid, and gas, and finally reach equilibrium. The ratio of the concentration in the phase is the organic carbon-water p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/86
CPCG01N30/06G01N30/86
Inventor 贾晓洋夏天翔姜林张丹
Owner 北京市生态环境保护科学研究院
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