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Grazing incidence X-ray fluorescence measuring device for quickly detecting heavy metal content in cosmetics

A technology for fluorescence measurement and cosmetics, applied in the field of swept-in X fluorescence measurement devices, can solve the problems of time-consuming and complicated operation, and achieve the effects of low cost, low labor intensity and short measurement time.

Active Publication Date: 2015-07-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] Most of the existing inspection methods are atomic absorption spectrophotometry and atomic fluorescence spectrophotometry, but these methods are complex and time-consuming, and can only measure one element at a time

Method used

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  • Grazing incidence X-ray fluorescence measuring device for quickly detecting heavy metal content in cosmetics
  • Grazing incidence X-ray fluorescence measuring device for quickly detecting heavy metal content in cosmetics
  • Grazing incidence X-ray fluorescence measuring device for quickly detecting heavy metal content in cosmetics

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Embodiment 1

[0029] 1. The silver target X-ray tube 1 of Dandong Dongfang Electron Tube Factory is used, and the X-ray tube high voltage 6 is set to 15,000 volts, which can effectively excite the special X-ray fluorescence of heavy metals in the sample; the angle stage 13 of Japan Sigma Company is used to make the excitation The angle between the X-rays emitted by the light source and the sample surface is 0.35 degrees, the distance between the X-ray tube 1 and the sample surface is 50 mm, and the diameter of the collimator 2 is 2 mm to ensure the best resolution of the heavy metal measuring instrument.

[0030] 2. The angle between the SDD-123 silicon drift detector 3 and the sample surface is 90 degrees and the distance is 15 mm, which is also used to ensure a better resolution of the analyzer.

[0031] 3. The excitation light source, detection device and digital multi-channel spectrometer 10 are fixed in the iron box 5 of 1 mm. The iron box 5 not only plays the role of electric shielding...

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Abstract

The invention discloses a grazing incidence X-ray fluorescence measuring device for quickly detecting the heavy metal content in cosmetics. The device comprises an excitation light source, a detecting device, a sample table, an analyzer and a circuit output device, wherein the excitation light source comprises an X-ray tube, X-ray tube high voltage and a collimator arranged at the outlet of the X-ray tube; the detecting device comprises a silicon drift detector, detector high voltage, a charge-sensitive preamplifier and a pulse-shaping amplifier; the sample table comprises a manual rotation displacement table, a goniometer table and a sample box; the analyzer is a digitized multi-channel spectrometer; the circuit output device comprises a computer, a stamper and a displayer. Through regulating the position and angle of the sample table, the X-ray emitted from the X-ray tube can irradiate on a cosmetic sample with a small angle to stimulate the characteristic X-ray fluorescence information of the heavy metal elements in the cosmetic sample, the fluorescence information is received by the silicon drift detector, converted into energyspectrum applicable to analysis by the digitized multi-channel spectrometer after being formed and amplified by the pulse-shaping amplifier, and the energyspectrum is processed and controlled by the computer.

Description

Technical field: [0001] The invention relates to a grazing-type X-ray fluorescence measuring device for quickly detecting the content of heavy metals in cosmetics, which adopts the principle of grazing-type X-ray fluorescence analysis, and can especially quickly detect the content of heavy metals in cosmetics, which belongs to the field of rapid analysis of elements. Background technique: [0002] There are many kinds of metals and non-metals contained in cosmetics, some of which are deliberately added to achieve certain specific effects. For example, adding mercury can often have a whitening effect, because mercury compounds will destroy the enzyme activity of the epidermis, so that melanin cannot be formed; lead oxides have a certain covering effect; they can also be used for whitening; arsenic has effects on proteins and various amino acids. Strong affinity, due to its special physical properties, it shows the characteristics of being easily absorbed by organisms, and is ...

Claims

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Application Information

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IPC IPC(8): G01N23/223
Inventor 张焱贾文宝张新磊安达奇陈达
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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