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A detection method for comparison test of formaldehyde emission by dryer method

A technology of formaldehyde emission and detection method, which is applied in the detection field of formaldehyde emission comparison test by dryer method, can solve the problems of poor timeliness, high cost, poor uniformity and stability, etc.

Active Publication Date: 2020-12-11
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of poor uniformity and stability of the wood-based panel samples used in the existing dryer method for formaldehyde emission testing, the problems of poor timeliness and high cost of technical solutions

Method used

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  • A detection method for comparison test of formaldehyde emission by dryer method
  • A detection method for comparison test of formaldehyde emission by dryer method
  • A detection method for comparison test of formaldehyde emission by dryer method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A detection method for the comparison test of formaldehyde emission in a dryer method, comprising:

[0067] Step 1: Standard Curve Drawing

[0068] 11) Formaldehyde solution calibration;

[0069] Transfer 1mL of formaldehyde solution with a concentration of 35-40% to a 1000mL volumetric flask, and dilute to the mark with distilled water; then measure 20mL of formaldehyde solution, 25mL of 0.05mol / L iodine standard solution, 10mL of 1mol / L hydroxide Sodium standard solution was mixed in a 100mL Erlenmeyer flask with a stopper; after standing in a dark place for 15min, 15mL of 1mol / L sulfuric acid solution was added to the mixture; excess iodine was titrated with 0.1mol / L sodium thiosulfate solution, and the titration approached the end point Add a few drops of 1% starch indicator and continue the titration until the solution becomes colorless; at the same time, use 20mL distilled water to do a blank parallel test;

[0070] The mass concentration of formaldehyde solutio...

Embodiment 2

[0130] A kind of desiccator method formaldehyde emission comparative test detection method: standard curve drawing, with embodiment 1;

[0131] Determination of the background concentration of the box is 0.005mg / m 3 , in line with the background concentration ≤ 0.006mg / m 3 the test conditions.

[0132] Take 1.25mL of analytically pure formaldehyde solution with a concentration of 37%, and dilute it to 750mL as a customized formaldehyde solution (concentration of formaldehyde solution is 0.6167‰).

[0133] Take 30ml of custom-made formaldehyde solution and pour it into a 100mL beaker (beaker diameter 59mm), place the beaker in the center of the wire support net in time (within 5min), and close the desiccator.

[0134] The test method is the same as in Example 1.

[0135] Repeated experiments of the same sample in 3 different laboratories, numbered No. 1, No. 2, and No. 3, respectively. Table 7-9 shows the measurement results of No. 1-3 formaldehyde custom-made solutions by t...

Embodiment 3

[0150] A kind of desiccator method formaldehyde emission comparative test detection method: standard curve drawing, with embodiment 1;

[0151] Determination of the background concentration of the box is 0.004mg / m 3 , in line with the background concentration ≤ 0.006mg / m 3 the test conditions.

[0152] Take 1.25mL of analytically pure formaldehyde solution with a concentration of 37%, and dilute it to 1000mL as a customized formaldehyde solution (the concentration of formaldehyde solution is 0.4625‰).

[0153] Take 30ml of custom-made formaldehyde solution and pour it into a 100mL beaker (beaker diameter 59mm), place the beaker in the center of the wire support net in time (within 5min), and close the desiccator.

[0154] The test method is the same as in Example 1.

[0155] Repeated experiments of the same sample in 3 different laboratories, numbered No. 1, No. 2, and No. 3, respectively. Table 11-13 shows the measurement results of No. 1-3 formaldehyde custom-made solutio...

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Abstract

The invention relates to a detection method for dryer method formaldehyde emission comparison test, and belongs to the technical field of formaldehyde detection. The method comprises the following steps: S1, drawing a standard curve; S2, preparing a customized formaldehyde solution; S3, preparing a dryer; S4, placing the customized formaldehyde solution; S5, carrying out sampling; and S6, measuring the mass concentration of formaldehyde. The problem that an existing artificial board sample for testing the formaldehyde emission through a dryer method is poor in uniformity and stability and theproblem that the technical scheme is poor in timeliness and high in cost are solved. The invention provides a detection method for dryer method formaldehyde emission comparison test, which is simple in preparation, simple and convenient to operate and less affected by external interference factors.

Description

technical field [0001] The invention relates to the technical field of formaldehyde concentration detection, and specifically provides a detection method for a comparison test of formaldehyde release by a drier method. Background technique [0002] GB 18580-2017 "Formaldehyde release in wood-based panels and their products for interior decoration materials" implemented on May 1, 2018, the new version of the standard stipulates that the test method for formaldehyde release from wood-based panels is 4.60 formaldehyde release in GB / T 17657-2013 Quantity determination - 1m 3 The provisions of the climate chamber method are carried out, while the perforation extraction method, desiccator method and gas analysis method in the old version of the standard are only used for production quality control. The standard stipulates the size of the test piece, length l=(500±5)mm; width b=(500±5)mm, and the surface area of ​​the test piece is 1m 2 , the test method and limit value of formal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N1/28
CPCG01N1/28G01N21/3103
Inventor 唐召群伍艳梅蒋松林赵磊王瑞
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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