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Detection method of organic acids in environment

A detection method and technology for organic acids, which can be used in measurement devices, instruments, scientific instruments, etc., can solve the problems of low concentration, high detection limit, non-linearity, etc., and achieve the effect of simple pretreatment and low detection limit.

Inactive Publication Date: 2017-06-13
SHANDONG ANALYSIS & TEST CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the disadvantages of being unfriendly to the environment and the human body, high detection limit, and non-linearity at low concentrations in the gas chromatography or liquid chromatography method for detecting organic acids in the environment in the prior art, the present invention provides a simple, Fast, Accurate, and Sensitive Detection of Organic Acids in the Environment

Method used

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  • Detection method of organic acids in environment
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  • Detection method of organic acids in environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the determination of elution program and analysis condition

[0030] Design and select the appropriate eluent concentration and flow rate. The goal of the second stage is to elute strongly retained ions such as Cl-, SO42-, NO3-, etc. Based on the experimental experience of detecting inorganic anions, the KOH concentration is set to 30mM. Under this condition, the strongly retained ions It can be completely eluted, so only the concentration of eluent in the first and third stages needs to be discussed. The effects of KOH concentrations of 0.5, 0.8, 1.0, 1.2mM and flow rates of 0.5, 1.0, 1.2mL / min on retention time and resolution were investigated. The experimental results are shown in Table 1, Table 2 and Table 3.

[0031] Table 1 The retention time and resolution of each substance under different eluent concentrations when the flow rate is 0.5mL / min

[0032]

[0033] Table 2 The retention time and resolution of each substance under different eluent co...

Embodiment 2

[0049] Example 2: Linearity, detection limits and precision of the method

[0050]The corresponding mixed standard series solutions were prepared from the standard stock solutions of each component, and analyzed according to the chromatographic detection conditions described in Example 1. According to the retention time qualitative, the peak area external standard method quantitatively obtained the linear regression equation and the correlation coefficient of each component. The reagent blank of this method is ultrapure water, and acetic acid, formic acid, propionic acid, and butyric acid were not detected in the reagent blank. Therefore, the detection limit of the method was calculated according to the provisions of the HJ168-2010 standard according to the whole steps of sample analysis.

[0051] The standard stock solution of described formic acid, acetic acid is made into the standard stock solution of 1000m / L with chromatographically pure formic acid, acetic acid reagent (...

Embodiment 3

[0057] Embodiment 3: the anti-interference experiment of method

[0058] Add a certain amount of F to the standard solution of formic acid, acetic acid, propionic acid and butyric acid - , Cl - , SO 4 2- , NO 3 - To test the feasibility and accuracy of the organic acid detection method. The result shows F - , Cl - , SO 4 2- , NO 3 - The retention times are 9.193, 20.473, 22.137 and 23.470min respectively, such as figure 1 shown. Therefore, the high concentration of Cl in the sample - , SO 4 2- , NO 3 - Does not interfere with the detection of formic, acetic, propionic, and butyric acids. f - The retention time of acetic acid is closer to the retention time of 10.743min before acetic acid, but usually the F in water samples - The content is low and will not interfere with the detection of acetic acid. When F - When the content is high, the acid can be tested for spiked recovery to ensure the accuracy of the test results.

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Abstract

The invention relates to the technical field of environment detection, in particular to a detection method of organic acids in an environment. The detection method comprises the following steps: acquiring an environmental sample; per-treating the sample: removing particulate matters and heavy metals; detecting a sample by using an ion chromatography; the elution procedure is shown as follows: 0.0-17.0 min in case of KOH concentration being 1.0 mM, 17.0-25.0 min in case of KOH concentration being 30.0 mM and 25.0-30.0 min in case of KOH concentration being 1.0 mM. The detection method has the benefits that the detection limit of the organic acids is low, detection requirements for the sample with lower content of the organic acids can be met, and a quick and effective method can be provided for simultaneous detection of formic acids, acetic acids, propionic acids, butyric acids and other small-molecular weight organic acids in surface water, underground water, waste water, ambient air, waste gas and other environmental samples.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method for detecting organic acids in the environment. Background technique [0002] Formic acid, acetic acid, propionic acid, and butyric acid are simple organic acids, which are important chemical raw materials and are widely used in industrial production such as rubber, medicine, fuel, and leather. Formic acid, acetic acid, propionic acid and butyric acid have pungent odor and are corrosive, which can damage eyes, mucous membranes, respiratory tract and skin, and can cause pathological changes in severe cases. Formic acid and acetic acid are the main organic acids in atmospheric precipitation. In recent years, it has been reported that low molecular weight organic acids are an important cause of acid rain. Some enterprises containing formic acid, acetic acid, propionic acid, and butyric acid are not treated up to the standard discharge, and the brewing waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 孙芸芸于帅栾玲玉李剑赵艳荣
Owner SHANDONG ANALYSIS & TEST CENT
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