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Method of fast detecting formol

A formaldehyde and fast technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of high instrument price, interference, cumbersome operation, etc., and achieve short detection time , Low investment in testing equipment and low testing costs

Inactive Publication Date: 2006-08-30
CHONGQING ACAD OF METROLOGY & QUALITY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are a series of sensitive and accurate methods for the determination of formaldehyde, such as spectrophotometric colorimetry, chromatographic analysis, and electrochemical oscillographic polarography. However, these methods need to be measured in the laboratory after sampling. Continuous rapid determination, analysis data lag, so most of them are not suitable for rapid detection in the field
In recent years, the rapid formaldehyde detection method based on the electrochemical principle has been widely used: such as the electrochemical sensor formaldehyde detector produced by the British PPM company and INTERSCAN company, the electrochemical formaldehyde detector produced by the Japanese COSMOS company and the American ESC company. Electrochemical formaldehyde detectors, these portable formaldehyde detectors have fast analysis speed, but the price of the instrument is high, the accuracy is poor, the interference is serious, and it is only suitable for the determination of formaldehyde in the air, not the formaldehyde in liquid and solid samples.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Saw a series of composite floor samples to be tested, with a length of (120±1) mm and a width of (40±1) mm; add 20 mL of deionized water to the absorption dish containing the extract. Put the container with the sample and the absorption dish into a household microwave oven with a microwave frequency of 2.45GHz and a microwave power of 1000W, start the microwave for rapid extraction, and the extraction time is 1min. Draw 10mL of the extracted formaldehyde solution into a 50mL Erlenmeyer flask with a stopper, add 10mL of acetylacetone (0.4% by volume) and 10mL of ammonium acetate solution (20% by mass), shake well, start microwave (frequency 2.45GHz) for rapid Color development, the color reaction time is 10s, and yellow solutions with different color depths are obtained. Take the composite floor with a formaldehyde content of 1.5mg / L measured by the GB18584 dryer method as a standard sample, and take the same operation steps as above to obtain a yellow solutio...

Embodiment 2

[0033] Embodiment 2: Get the series veneer samples that have measured the formaldehyde content by the GB18584 drier method, saw and cut into long (150 ± 1) mm, wide (50 ± 1) mm sample blocks; , add 30 mL of deionized water. Put the container with the sample and the absorption dish into the microwave reactor, the microwave frequency is 2.45GHz, the microwave power is 800W, start the microwave for rapid extraction, and the extraction time is 30s. Draw 10mL of the extracted formaldehyde solution into a 50mL Erlenmeyer flask with a stopper, add 10mL of acetylacetone (0.4% by volume) and 10mL of ammonium acetate solution (20% by mass), shake well, start microwave (frequency 2.45GHz) for rapid Color development, the color reaction time is 15s, and yellow solutions with different color depths are obtained. Measure the absorbance A of the series of yellow solutions at 412 nm on the spectrophotometer with a cuvette with a thickness of 5 mm. Taking the formaldehyde content of the seri...

Embodiment 3

[0034] Embodiment 3: weigh 1.0g ferric ammonium sulfate [NH 4 Fe(SO 4 ) 2 12H 2 O, superior grade], dissolved with 0.1mol / L hydrochloric acid solution, and diluted to 100mL, to obtain ferric ammonium sulfate solution. Accurately weigh 0.1 g of phenol reagent [hydrochloric acid-3-methyl-2-benzothiazolone hydrazone, C 6 h 4 SN(CH 3 )C:NNH 2·HCl, referred to as MBTH] Add water to dissolve, pour it into a 100mL volumetric flask, add water to the mark, that is, absorb the original solution. Draw 5mL of the absorption stock solution, add 95mL of water, and mix well to obtain the absorption solution. Sawing the plywood sample to be tested, the length is (120±1) mm, the width is (40±1) mm; add 10 mL of the above-mentioned phenol reagent absorption liquid to the absorption dish containing the extraction liquid. Put the container containing the sample and the absorption dish into a household microwave oven with a microwave frequency of 2.45GHz and a microwave power of 900W, star...

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Abstract

The invention relates to a method to testing formaldehyde rapidly that uses water or formaldehyde developer as liquid extract, taking extract to the releasing material from the tested sample lasting for at least 3 minutes, and the microwave frequency range is 1GHz-30GHz. Adding formaldehyde developer into the extract liquid of tested sample, mixing to equal, heating the extract liquid and observing the alteration of the color to take qualitative analysis whether the liquid contains formaldehyde and determining whether the sample contains formaldehyde. By comparing the color of the liquid with standard color, the content of the sample would be measured. The invention has short testing time, low const and would be used in and locale.'

Description

(1) Technical field [0001] The invention relates to a method for detecting formaldehyde in solid samples, in particular to a method capable of rapidly detecting formaldehyde on site. (two), background technology [0002] Adhesives for wood-based panels are mainly urea-formaldehyde resin glue. Unfortunately, urea-formaldehyde glue will continue to release a large amount of free formaldehyde during the process of making glue and pressing boards, and the wood-based panels made of urea-formaldehyde glue during its long-term use. The wood-based panels made of urea-formaldehyde glue, such as medium density fiberboard, particleboard, plywood, composite flooring, and blockboard, release free formaldehyde slowly and continuously to the surrounding environment. The peak period is within 3 years, and the decline period is within 3-15 years. 15 Years later, the problem of environmental pollution in its release can be lifted. The concentration of free formaldehyde in humans is 0.2mg / m ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 吕长富周冕汤远志王豪
Owner CHONGQING ACAD OF METROLOGY & QUALITY INST
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