Use and Principle of the Filter Material Tester

The increasing global trade disputes are the main reason for the "green barriers" of textile industry. Developed countries all have strict regulations on the content of harmful substances in their entry and exit textiles. Therefore, the textile tester take for example the Wet Penetration Tester has become a popular product, and this article will introduce it to you.

With the increasing global trade disputes, developed countries have set up barriers to entry for textiles from developing countries through so-called "green barriers" in order to protect their precarious textile industry.



Under the current competitive environment, the traditional textile quality management standards can no longer meet the requirements of the current international trade market for textile quality. With the intensification of international textile competition, it is believed that the restrictions on textile ecological and health standards will become the main indicators to measure textile quality in the future, and the requirements for textile safety inspection will gradually become stricter.

Common chemical detection methods and suggestions for improvement

Detection of formaldehyde

Formaldehyde is widely used in the production process of textiles, especially the textile auxiliary agent with formaldehyde as reactant has stronger durability; However, fabrics treated with formaldehyde have better crease resistance and shrinkage resistance. However, due to the adverse effects of formaldehyde on human health, the detection of formaldehyde content in textiles has become an important part of its safety detection. Generally speaking, the methods for detecting formaldehyde content in textiles mainly include the following.

Meteorological chromatographic determination

The determination method of meteorological chromatography finally determines the formaldehyde content of textiles by measuring the polarity of formaldehyde released by trace amounts. Traditional formaldehyde trace is determined by acetylacetone colorimetry. However, due to the problems of small current measurement range and complicated measurement procedures, it is difficult to adapt to the characteristics of multiple batches and varieties of textiles and large fluctuation range of formaldehyde content in foreign trade.

After analyzing the chemical characteristics of formaldehyde and combining with the practical experience of long-term detection, we found that choosing 2,4-dinitrophenylhydrazine (2,4-DNPH) as derivatization agent and cyclohexane as extractant to detect formaldehyde residue in textiles not only greatly simplified the detection steps and expanded the linear detection range of content, but also reduced the risk of the detection process due to the low toxicity of cyclohexane, thus greatly improving the trace detection range of formaldehyde in textiles.

Atomic spectrophotometry

At present, the most widely used method for determination of heavy metal residues in textiles is flame atomic absorption spectrometry. More than 60 kinds of heavy metal elements that may remain in textiles can be detected effectively and quickly by flame atomic absorption spectrometry. Because the method has simple detection steps and relatively wide detection range, it has a good detection effect on heavy metal residues in textiles.

In contrast, although the graphite furnace atomic absorption spectrometry has higher efficiency, its detection range is relatively small, and it is easily affected by the external environment, thus affecting the accuracy of measurement. For several common heavy metal elements, such as arsenic and mercury, the detection effect of this method is not ideal, so it is suggested to use atomic fluorescence spectrometry for detection.

Inductively coupled plasma emission spectrometry

As far as the current practice of detecting heavy metal content in textiles is concerned, inductively coupled plasma emission spectrometry (ICP-AES) is one of the most effective methods. However, this method also has some defects, such as a slight lack of sensitivity in detecting mercury content in textiles, and the mercury content in general textiles is relatively low, so it is difficult to meet the detection needs simply by ICP-AES.

However, if it is used in combination with cyanide generator, and the elements to be measured are sent to ICP in the form of mercury vapor and separated, it can reduce matrix interference and enhance enrichment, thus reducing the detection limit of analysis and reaching the standard of extractable trace mercury in textiles.