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◉ Introduce
Common heavy metal elements in textiles and leather include lead, nickel, cadmium, copper, arsenic, mercury cobalt and chromium, etc. The main source is the use of dyes and auxiliaries in the processing process, such as various metal complex dyes, flame retardants, Tanning agents, etc.
◉ Harm
Heavy metals are very difficult to be biodegraded. Heavy metals can interact strongly with proteins and enzymes in the human body, making them inactive, and may also accumulate in some organs of the human body, resulting in chronic poisoning.
◉ Detection Method
Heavy metal detection is mainly spectroscopic and mass spectrometry. include:
(1) Atomic absorption spectroscopy (FAAS, GFAAS)
Characteristic spectral radiation is emitted by a light source such as a hollow cathode lamp, passes through the atomizer, and obtains monochromatic light from the spectroscopic system, and then passes through the photomultiplier tube to reach the detector. When the atomizer injects samples, the light passes through the atomizer. A part is absorbed and the transmittance is reduced. According to Lambert Beer's law, the absorbance is proportional to the concentration of the sample, so the concentration of the sample can be obtained from the absorbance. Atomic absorption spectrometry includes flame atomic absorption spectrometry and graphite furnace atomic absorption spectrometry. The former is easy to use and the latter has high sensitivity, and is widely used in the field of heavy metal detection.
(2) Atomic fluorescence spectroscopy (AFS)
When an excitation light source with a certain intensity is used to irradiate atomic vapor containing a certain concentration of the element to be measured, atomic fluorescence of a certain intensity will be generated, and the content of the element in the sample to be measured can be obtained by measuring the intensity of the atomic fluorescence. The instrument is relatively simple, has high sensitivity, and is easy to use. It is an economical and practical inorganic element detection instrument.
(3) Inductively Coupled Plasma Emission Spectroscopy (ICP-AES)
Using a high energy source, the electrons are first excited from the ground state to a higher energy level, and the excited electrons release energy and fall back to the lower energy level, and emit light with a characteristic wavelength in the form of radiation. According to the relationship between the luminous intensity and the concentration of the element to be measured , the content of the element to be measured in the sample can be obtained. ICP-AES/OES has the characteristics of high precision, high sensitivity, low matrix interference, wide linear range, etc., and can detect multiple elements at the same time, and has been widely used.
(4) Inductively coupled plasma mass spectrometry (ICP-MS), etc.
Inductively coupled plasma mass spectrometry (ICP-MS) is a detection technology that combines plasma technology and mass spectrometry technology, using inductively coupled plasma technology as the ion source and mass spectrometry technology as the detection method. Electrons are excited using a high energy source and dislodged from the electron shells of atoms, producing free electrons and positively charged ions. After the ions are extracted, they pass through the mass filter and are detected. The concentration of the element to be measured can be determined by directly measuring the number of ions passing through the mass filter. The analysis method has the characteristics of high sensitivity, strong resolution, low detection limit, wide analysis range, fast analysis speed, accurate detection results, and can detect almost all elements in the periodic table, and has good application prospects.
To sum up, it can be seen that the spectral techniques represented by atomic absorption spectroscopy, atomic fluorescence spectroscopy and atomic emission spectroscopy and mass spectrometry represented by inductively coupled plasma mass spectrometry have been applied to the detection of heavy metal elements in textiles and leather. .
Atomic absorption spectrometry, atomic fluorescence spectrometry and atomic emission spectrometry have played an important role in the detection of heavy metal elements in textiles and leather due to mature technology and low cost.
Although inductively coupled plasma mass spectrometry has advanced technology, high detection sensitivity and wide dynamic range, it has a high cost and has not been popularized in the field of textile and leather detection. widely used.
◉ Compliance Services
As a professional third-party testing and certification service organization, Jiayu Testing has qualifications such as CMA, CNAS, CBTL, CPSC, and has obtained laboratory accreditation from multiple authoritative certification agencies at home and abroad. The laboratory is strictly built and managed according to standards, equipped with advanced instruments and equipment, and has a skilled professional technical team with rich industry service experience and strong testing technology capabilities. It is proficient in various regulatory standards and provides heavy metal testing services to assist enterprises in actively responding to regulatory requirements and effectively improving product compliance. Welcome to contact us at 400-9269-886!
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