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A method for predicting the partition coefficient of organic matter in different herb-air systems based on chlorophyll correction factors

A technology of correction factor and air distribution, applied in measuring devices, biological testing, analytical materials, etc., can solve the problem of less research, achieve the effect of reducing workload, overcoming species differences, and realizing safety assessment

Active Publication Date: 2020-05-01
DALIAN NATIONALITIES UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, at present, there are few studies on revealing the interspecies variation of plant absorption of gaseous pollutants and providing a comprehensive and effective analysis method for plant passive sampling techniques, and are in a bottleneck stage
As the global air pollution problem becomes more and more serious, the accurate prediction of the plant-air partition coefficient (K PA ) is of great significance and value for evaluating the concentration of organic matter in the atmosphere from the concentration of organic matter enriched in plants, but the K of different plants PA There are significant differences in the values, so how to overcome the interspecific differences of plants and find a simple and feasible method to predict the K of different plants PA The value method is very important for air quality assessment and ecological risk assessment, and it will also simplify the monitoring of air pollutants

Method used

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  • A method for predicting the partition coefficient of organic matter in different herb-air systems based on chlorophyll correction factors
  • A method for predicting the partition coefficient of organic matter in different herb-air systems based on chlorophyll correction factors
  • A method for predicting the partition coefficient of organic matter in different herb-air systems based on chlorophyll correction factors

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Experimental program
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Effect test

Embodiment 1

[0032] Select different herbs, ryegrass, plantain, and yarrow, and determine the plant-air partition coefficients of polychlorinated biphenyls (PCBs) on different herbs at 25°C.

[0033] S1. At first, measure above-mentioned reference plant chlorophyll content Chl respectively 1 and the plant-air partition coefficients of PCBs compounds on reference plants. Chl 1 It is measured by spectrophotometry, and 80% acetone is used to extract plant chlorophyll under dark conditions within a certain time interval. Measure the absorbance value A of the chlorophyll solution at wavelengths of 645nm and 663nm respectively 645 、A 663 . Then calculated by the formula (6).

[0034] Chl (mg / L) = 20.2A 645 +8.02A 663 (6)

[0035] Among them, A 645 is the absorbance value of the chlorophyll extract at a wavelength of 645nm; A 663 is the absorbance value of the chlorophyll extract at a wavelength of 663nm.

[0036] K PA1 It is the plant-air partition coefficient of a certain organic c...

Embodiment 2

[0044] S1. Taking ryegrass in Table 1 as the reference plant, according to the plant-air partition coefficient K of PCBs on ryegrass provided in Table 1 PA Calculate the benchmark normalized K of this organic compound on ryegrass PA / Ch Value, Ryegrass Chl 1 = 1.14; plantain Chl 2 = 1.38, namely

[0045]

[0046] S2. Calculate the transition value K' of the predicted distribution coefficient PA ,Right now

[0047] K' PA = K PA / Ch ×Chl 2 (3)

[0048] S3. Since the oil content of plants or other environmental factors may have an inevitable impact on the calculation results, a constant β is introduced to correct the calculation results. Since the values ​​of β are roughly the same for the same plant, only by calculation The measured value K of the distribution coefficient of one or a part of the PCB compound on the plant to be tested PA2实测 The β value used for the calculation of the plant can be deduced, and then the distribution coefficient K of the remaining PCBs co...

Embodiment 3

[0060] The present embodiment takes ryegrass in table 1 as reference plant, according to the plant-air partition coefficient K of PCBs on ryegrass provided in table 1 PA Calculate the benchmark normalized K of this organic compound on ryegrass PA / Ch Value, Ryegrass Chl 1 = 1.14; Yarrow Chl 2 =1.52, calculate Yarrow K according to formula (1)-(6) PA2 The results are shown in Table 3.

[0061] Table 3 The partition coefficient of PCBs on ryegrass predicts its K on yarrow PA

[0062]

[0063] Table 3 is to apply the method proposed by the present invention to estimate the K of various organic matter on yarrow according to the plant-air partition coefficient of PCBs on ryegrass PA It can be seen that the calculation results corrected by the constant β are in good agreement with the real measured K PA The error between them is small and has strong reliability.

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Abstract

The invention provides a method for predicting a distribution coefficient of an organic matter in different herbaceous plant-air systems based on a chlorophyll correction factor. The method is a method capable of estimating the KPA values of different plants more accurately and effectively, the species difference of the plants is overcome, the plant-air distribution coefficients of the organic matter on different herbaceous plants are effectively predicted, the method provided by the invention is conducive to accurately predicting the concentration of volatile organic pollutants in the atmosphere, is conducive to achieving the secure evaluation of volatile chemicals and toxic and harmful gases, and achieving the standardization of grassland ecological balance, food chain safety and human health risk assessment, and is also conducive to the application and management of chemicals. Furthermore, the environmental information of grassland volatile matters obtained by the method provided bythe invention is of great significance for analyzing the grassland ecological environment quality and the climate change influence.

Description

technical field [0001] The invention belongs to the technical field of predicting the enrichment of organic matter in plants and the level of existence in the atmosphere, and specifically relates to a method for studying the concentration of enriched organic matter in plant leaves at low cost and predicting its correlation with the level of low-concentration organic matter in the atmosphere. Background technique [0002] Most of the environmental organic pollutants are volatile and semi-volatile. Due to their high utilization rate, large environmental discharge, and easy bioaccumulation, they pose a serious threat to the environment and ecosystem. Such volatile and semi-volatile organic pollutants ( The global distribution and toxicity of VOCs and SVOCs have attracted increasing attention. [0003] In recent decades, sensitive and effective techniques for the collection and analysis of gaseous organic pollutants have received extensive attention. The sampling methods of atm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/48G01N33/00G01N21/31
Inventor 董玉瑛徐燕孙国权朱松梅邹学军
Owner DALIAN NATIONALITIES UNIVERSITY
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