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Acetylacetone method and high performance liquid chromatography
Comparison of detection of formaldehyde content in coatings
Formaldehyde is usually a colorless gas with a pungent odor, which is irritating to human eyes and nose
.
Formaldehyde polymerizes at low temperature to form trioxane, which becomes free formaldehyde when it escapes when heated and can be slowly released into the air at room temperature, causing indoor environmental pollution
.
In the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization, formaldehyde is listed as a class of carcinogens .
Online coatingol.
com
.
With the increase of people’s awareness of environmental protection and the importance of their own health, attention to the content of formaldehyde in coatings has continued to increase.
Therefore, the requirements for the limit of formaldehyde content in coatings are becoming more and more stringent, followed by the requirements for the determination of formaldehyde content in coatings.
Also getting higher and higher
.
The national compulsory standard GB 18582-2020 "Limit of Hazardous Substances in Wall Coatings for Buildings" compared to the previous version has reduced the limit of formaldehyde content from 100mg/kg to 50mg/kg; according to the requirements of GB/T 35602-2017 "Green Product Evaluation Coatings", The interior and exterior wall coatings and interior wall putty of water-based architectural coatings have two items of formaldehyde content and free formaldehyde limit requirements, and correspond to different detection methods
.
The comparison of the two commonly used standards for formaldehyde content detection methods in coatings is shown in the table below
.
Table 1: Comparison of different detection methods for formaldehyde content
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| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-size: 12px; overflow-wrap: break-word ;"> GB/T 23993-2009-Acetylacetone spectrophotometry | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> 1. 2. 3. | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 14px;"> 5mg/kg |
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-size: 12px; overflow-wrap: break-word ;"> GB/T 34683-2017-High performance liquid chromatography | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> 1. Acetonitrile extraction sample 2. 3. | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 14px;"> 1. |
Uncertainty evaluation of different detection methods
The main factors affecting the determination of formaldehyde content are sample pretreatment methods and quantitative detection methods
Table 2: Comparison of different pretreatment methods
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: center; font-size: 12px;"> Pre-treatment method | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px; text-align: center;"> advantage | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px; text-align: center;"> shortcoming |
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: left; font-size: 12px;"> Distillation (GB/T 23993-2009) | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> 1. 2. 3. | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> 1. 2. 3. |
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: left; font-size: 12px;"> Extraction method (GB/T 34683-2017) | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> 1. 2. | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px;"> Large amount of organic solvents |
Table 3: Characteristics of different quantitative methods
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: center; font-size: 12px;"> Quantitative detection method | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 12px; text-align: center;"> Features |
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: left; font-size: 12px;"> Acetylacetone spectrophotometry | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 14px;"> 1. 2. 3. 4. |
| us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; text-align: left; font-size: 12px;"> High performance liquid chromatography | us" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word ; font-size: 14px;"> 1. 2. 3. 4. |
In contrast, the acetylacetone spectrophotometric method uses distillation to process paint samples, which will increase the uncertainty of the test results
.
Coatings or certain raw materials (such as surfactants, biocides) are mixtures of multiple substances.
When implementing the GB 18582 standard, the detection of formaldehyde content is to use distillation to process the sample, which is likely to distill out interfering substances or decompose to produce formaldehyde , Resulting in unsatisfactory detection data
.
In summary, the different methods for detecting formaldehyde content in paint products have their own characteristics.
The acetylacetone spectrophotometry is suitable for products with higher formaldehyde content and has a wide measurement range, but there are many interference factors and high uncertainty in the detection results
.
Some paint raw materials are easy to decompose or volatilize after high temperature distillation, or samples with low free formaldehyde content, high performance liquid chromatography will be more accurate
.
