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Method for detecting trace formaldehyde

A detection method and formaldehyde technology, applied in the field of analytical chemistry, can solve the problems of not conforming to the concept of green environmental protection detection, consumption of toxic organic solvents, complex and harsh operating conditions, etc., and achieve good application prospects, simple sample pretreatment, and wide linear range. Effect

Inactive Publication Date: 2014-03-19
CHANGCHUN ZHONGYUAN INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it requires the use of large instruments, consumes a large amount of toxic organic solvents, the cost of consumables is high, and the operating conditions are complicated and harsh. It is not suitable for on-site detection and does not conform to the detection concept of green environmental protection.

Method used

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  • Method for detecting trace formaldehyde
  • Method for detecting trace formaldehyde
  • Method for detecting trace formaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Add 500μL of the standard solution into a 5mL centrifuge tube, add 100-300μL of 1.0mol / L NaOH solution and 200μL of 5g / L AHMT solution and mix well. Derivatize for 20min at room temperature. Take out 10 μL and add 500 μL of the enhancement reagent, mix for 2.5 min at room temperature, and measure the Raman strength. At the same time, a blank experiment was performed. Calculate and deduct the blank Raman intensity, the influence of 1.0mol / L NaOH solution dosage on Raman intensity is as follows: figure 2 Shown. In the range of 100-300μL, with the increase of the amount of NaOH solution, the blank Raman intensity first increases and then decreases, reaching the maximum when the amount is 200μL. Therefore, the optimal amount of 1.0mol / L NaOH solution in the derivatization reagent is 200μL.

Embodiment 2

[0031] Add 500μL of the standard solution to a 5mL centrifuge tube, add 200μL of 1.0mol / L NaOH solution and 100~300μL of 5g / L AHMT solution and mix well. Derivatize for 20min at room temperature. Take out 10 μL and add 500 μL of enhancer reagent, mix for 2.5 min at room temperature, and measure the Raman intensity. At the same time, a blank experiment was performed. Calculate and deduct the blank Raman strength, the effect of the amount of 5g / L AHMT solution on the Raman strength is as image 3 Shown. In the range of 100-300μL, as the dosage of AHMT solution increases, the blank Raman intensity will increase first and then decrease, reaching the maximum when the dosage is 200μL. Therefore, the optimal amount of 5g / L AHMT solution in the derivatization reagent is 200μL.

Embodiment 3

[0033] Add 500μL of standard solution to a 5mL centrifuge tube, add 200μL of 1.0mol / L NaOH solution and 200μL of 5g / L AHMT solution and mix well. Derivatize at room temperature for 10-30min. Take out 10 μL and add 500 μL of the enhancement reagent, mix for 2.5 min at room temperature, and measure the Raman strength. At the same time, a blank experiment was performed. Calculate the blank Raman intensity, the influence of the derivatization time on the Raman intensity is as Figure 4 Shown. In the range of 10 to 30 minutes, with the increase of time, the blank Raman intensity gradually increases, and reaches the maximum at 20 minutes, and there is no change in the extended time, which proves that the derivatization is complete in 20 minutes. Therefore, the best time for derivatization is 20 minutes.

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Abstract

The invention discloses a method for detecting trace formaldehyde, and belongs to the technical field of analytical chemistry. The method for detecting trace formaldehyde comprises the following steps: by taking an extract of a solid sample or a filtrate of a liquid sample as a liquid to be detected, adding a derivatization reagent into the liquid to be detected, and deriving at room temperature so as to obtain a derivative product; adding a small amount of the derivative product into a reinforcing agent, and standing for minutes at room temperature; testing a raman spectrum within a range of 600-1800cm<-1> by using a portable type laser-raman spectrometer, and quantitatively detecting trace formaldehyde according to a regression equation between the formaldehyde concentration c and a peak area A which is obtained after the blank solution peak area is deducted at (832+ / -5)cm<-1>. The method disclosed by the invention is simple to operate, low in cost, good in reproducibility and high in sensitivity, the limit of quantification can be 1mu g / L, the detection on trace formaldehyde is achieved, and the method is applicable in on-site detection and easy to popularize, and has good application prospect.

Description

Technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a surface enhanced Raman spectroscopy method for detecting the concentration of trace formaldehyde in food and environmental water. Background technique [0002] Formaldehyde is an important chemical raw material and organic solvent. It has a pungent odor at low concentrations and is listed as a suspected carcinogen by the International Agency for Research on Cancer (IARC). Ingestion or inhalation of formaldehyde can cause irritation to the mucous membrane of the digestive tract, causing symptoms such as nausea, vomiting, and shock, as well as renal damage. It is generally believed that the lethal dose of oral formaldehyde is 3.5~5.25mg / m 3 . [0003] The formaldehyde in food mainly comes from two aspects. On the one hand, it comes from the food manufacturing material itself. Because formaldehyde is an intermediate product of cell metabolism, some foods contain a certain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/28
Inventor 宋大千马品一
Owner CHANGCHUN ZHONGYUAN INSTR
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