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Method for detecting formaldehyde in air

A detection method, formaldehyde technology, applied in the field of formaldehyde detection in the air, can solve the problems of deviation, difficulty and volatility of the final detection result of formaldehyde content, and achieve the effect of low detection limit, high accuracy and low pretreatment cost

Inactive Publication Date: 2018-06-22
安徽宏远职业卫生技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since formaldehyde is very soluble in water and volatile, it is difficult to directly measure the content of formaldehyde in the air.
Moreover, during the detection process of formaldehyde, due to the influence of moisture in the air, there is a large deviation in the final detection result of formaldehyde content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of detection method of formaldehyde in the air that the present invention proposes, comprises the following steps:

[0025] S1. Add 16 mL of distilled water into the absorption tube of the porous glass plate;

[0026] S2. Use the sampling gas pump to collect gas in the environment, fill the gas into the porous glass plate absorption tube, and obtain the formaldehyde absorption liquid, wherein the sampling flow rate of the sampling gas pump is 1.2L / min, and the sampling volume is 40L;

[0027] S3, take formaldehyde to dilute and prepare the standard formaldehyde solution that concentration is 0.1, 0.2, 0.4, 0.6, 0.8g / L;

[0028] S4, determine gas chromatography measurement condition, the standard formaldehyde solution of preparation is carried out gas chromatography measurement;

[0029] Wherein, the detection condition of gas chromatography is:

[0030] Carrier gas: high purity helium;

[0031] Carrier gas flow rate: 1.2ml / min;

[0032] Chromatographic column...

Embodiment 2

[0038] A kind of detection method of formaldehyde in the air that the present invention proposes, comprises the following steps:

[0039] S1. Add 22mL of distilled water into the absorption tube of the porous glass plate;

[0040] S2. Use the sampling gas pump to collect gas in the environment, fill the gas into the porous glass plate absorption tube, and obtain the formaldehyde absorption liquid, wherein the sampling flow rate of the sampling gas pump is 1.5L / min, and the sampling volume is 40L;

[0041] S3, take formaldehyde to dilute and prepare the standard formaldehyde solution that concentration is 0.1, 0.2, 0.4, 0.6, 0.8g / L;

[0042] S4, determine gas chromatography measurement condition, the standard formaldehyde solution of preparation is carried out gas chromatography measurement;

[0043] Wherein, the detection condition of gas chromatography is:

[0044] Carrier gas: high purity helium;

[0045] Carrier gas flow rate: 1.2ml / min;

[0046] Chromatographic column:...

Embodiment 3

[0052] A kind of detection method of formaldehyde in the air that the present invention proposes, comprises the following steps:

[0053] S1. Add 18mL of distilled water into the absorption tube of the porous glass plate;

[0054] S2. Use the sampling gas pump to collect gas in the environment, fill the gas into the porous glass plate absorption tube, and obtain the formaldehyde absorption liquid, wherein the sampling flow rate of the sampling gas pump is 1.3L / min, and the sampling volume is 40L;

[0055] S3, take formaldehyde to dilute and prepare the standard formaldehyde solution that concentration is 0.1, 0.2, 0.4, 0.6, 0.8g / L;

[0056] S4, determine gas chromatography measurement condition, the standard formaldehyde solution of preparation is carried out gas chromatography measurement;

[0057] Wherein, the detection condition of gas chromatography is:

[0058] Carrier gas: high purity helium;

[0059] Carrier gas flow rate: 1.2ml / min;

[0060] Chromatographic column:...

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Abstract

The invention discloses a method for detecting formaldehyde in the air, belonging to the technical field of air detection. The method comprises the following steps: adding 16-22 mL of distilled waterinto a porous glass plate absorption tube; collecting gas in an environment, and filling the porous glass plate absorption tube with the collected gas so as to obtain a formaldehyde-absorbed solution;diluting formaldehyde to prepare standard formaldehyde solutions with concentrations which are in a range of 0.1-1.0 g / L and present at least five different concentration gradients; determining gas chromatographic determination conditions, subjecting the prepared standard formaldehyde solutions to gas chromatographic determination, and drawing a standard curve; and carrying out gas chromatographic determination on the formaldehyde-absorbed solution. The method of the invention can realize rapid and direct detection of the content of formaldehyde in the air, has high sensitivity, low detectionlimit, no complicated pre-treatment process and high accuracy of detection results, and is an accurate, efficient and sensitive analysis method for determining the content of formaldehyde.

Description

technical field [0001] The invention relates to the technical field of air detection, in particular to a method for detecting formaldehyde in air. Background technique [0002] Formaldehyde is a protoplasmic poison and one of the main pollutants in the air. It has been identified as a potential dangerous carcinogen and an important environmental pollutant by the World Health Organization (WHO) and the U.S. Environmental Protection Agency (EPA). In recent years, there have been many reports about formaldehyde. Formaldehyde has carcinogenic and cancer-promoting hazards, especially for the elderly, children, and pregnant women with low immunity. Surveys show that long-term excessive inhalation of formaldehyde can cause various serious diseases such as nasopharyngeal cancer and throat cancer. The harm of formaldehyde to human body is mainly manifested through aspects such as allotriosmia, stimulation, allergy, abnormal pulmonary function, abnormal liver function, and immunolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 夏怀翔赵华芝孔玉萍严章飞方栋张强段志祥
Owner 安徽宏远职业卫生技术服务有限公司
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