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Preparation method of formaldehyde standard gas

A preparation method and standard gas technology, which can be used in measurement devices, instruments, scientific instruments, etc., and can solve problems such as unrealistic

Inactive Publication Date: 2009-03-18
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, it is unrealistic to calibrate a single or a small amount of formaldehyde detectors using the above method to prepare formaldehyde standard gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] 1. Use a clean and dry 100mL all-glass syringe as the gas distribution container for formaldehyde;

[0019] 2. Use a micro-syringe to draw 5 μL of chemically pure or analytically pure or superior pure concentrated formaldehyde solution (35% to 40%) into a sealed 100mL glass syringe filled with clean air filtered through an activated carbon column, and blow it evenly with a hair dryer until Cool to room temperature after complete volatilization;

[0020] 3. Immediately transfer the gas in the syringe to another dry, clean, sealed glass syringe of the same volume and let it stand for 15 minutes;

[0021] 4. Transfer the dry formaldehyde gas in the syringe to another dry and clean sealed glass syringe of the same volume and let it stand for 60 minutes;

[0022] 5. Take an appropriate amount of formaldehyde gas after the above treatment, inject it carefully and slowly into the absorption liquid, calibrate its formaldehyde content with phenol reagent spectrophotometry, and ...

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Abstract

The invention discloses a preparation method of standard formaldehyde gas, which comprises the following steps: absorbing 1-10 muL dense formaldehyde solution with 35-40 percent density by microinjector; injecting the dense formaldehyde in the sealing and clean of the first glass injector with full of active carbon column; heating the first glass injector to volatilize the formaldehyde solution; cooling the first glass injector to the indoor temperature; transmitting the formaldehyde gas from the first glass injector to the second and third glass injectors; marking the disposed formaldehyde gas through standard method as the formaldehyde reservation gas; adapting the clean air filtered by active carbon column as diluent to finish the standard formaldehyde gas of random density.

Description

technical field [0001] The present invention relates to a kind of preparation method of standard gas, more specifically relate to a kind of preparation method of standard formaldehyde gas. Background technique [0002] The formaldehyde detector uses a relative comparison method for measurement. Usually, the instrument is calibrated with a zero formaldehyde gas and a standard concentration of formaldehyde gas, and the obtained standard curve is stored in the instrument. During the measurement, the instrument compares the electrical signal generated by the concentration of the gas to be measured with the electrical signal of the standard concentration, and calculates the accurate value of the formaldehyde gas concentration. Therefore, zeroing the instrument at any time and frequently calibrating the instrument are necessary tasks to ensure the accuracy of the formaldehyde detector. [0003] Formaldehyde is chemically unstable, easily soluble in water, and easy to polymerize. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25G01N30/02
Inventor 葛启仁
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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