Analysis method of heavy metals in textiles

An analysis method and textile technology, applied in the analysis of materials, material analysis using wave/particle radiation, preparation of test samples, etc., can solve problems that are not conducive to the safety of testing personnel, pollute the environment, and expensive instruments, etc., to save strong acid and strong oxidants, simple spectral lines, and fast detection speed

Inactive Publication Date: 2013-11-13
THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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Problems solved by technology

The test methods corresponding to the above textile heavy metal limit regulations generally use atomic absorption spectrometry or inductively coupled plasma emission spectrometry. These instruments are relatively expensive, and require samples to be digested in advance and final

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  • Analysis method of heavy metals in textiles
  • Analysis method of heavy metals in textiles
  • Analysis method of heavy metals in textiles

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Embodiment Construction

[0021] The present invention uses X-ray fluorescence analysis method to analyze the content of heavy metals in textiles. The principle is: after the sample is irradiated by suitable X-rays, the electrons in the heavy metal atoms are expelled, and a vacancy is generated in the atomic orbit, and the electrons in the outer layer transition To this track, to fill this vacancy, the excess energy is released in the form of X-ray fluorescence, which can be regarded as a spectral line in the spectrum. The energy of X-ray fluorescence depends on the energy difference between the transition orbitals. The energy of each atom is certain, so the characteristic spectral lines emitted are also certain, which can be qualitative. After measuring the fluorescence intensity, check the corresponding concentration from the standard curve or use the linear regression equation of the standard curve to calculate the content of the heavy metal element to be measured in the sample.

[0022] The purpose...

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Abstract

The invention discloses an analysis method of heavy metals in textiles. The method comprises the following steps: firstly, uniformly mixing cadmium nitrate, nickel nitrate, lead nitrate and lithium borate, and grinding to prepare a plurality of standard reserve substances in different mass concentrations; secondly, mixing the standard reverse substances with standard polyester-accompanied fragments to prepare a plurality of standard products in different mass concentrations; thirdly, measuring the fluorescence intensity of each element in the standard products, drawing a scatter diagram by taking the concentration as an X axis and the fluorescence intensity of the element as a Y axis to obtain a standard curve of each element and calculating a linear regression equation of each standard curve; and finally, measuring the X ray fluorescence intensities of cadmium, nickel and lead in a textile sample to be detected, checking the corresponding concentrations on the standard curve, or calculating the concentrations of the cadmium, the nickel and the lead in the sample to be detected according to the linear regression equations. The analysis method disclosed by the invention can be used for directly testing an original sample without damaging the sample and high in detection speed; the dosages of strong acid and a strong oxidant for digestion are reduced, and the damages to environments and testers are reduced.

Description

technical field [0001] The invention relates to a qualitative and quantitative analysis method for heavy metals in textiles. Background technique [0002] In recent years, with the enhancement of people's awareness of ecological and environmental protection, the safety and environmental protection of textile and clothing have gradually attracted people's attention. Heavy metal pollution in textiles and clothing as daily consumer goods has also attracted widespread attention. There are many directives and regulations on the limit of heavy metals in textiles distributed in Europe and the United States. For example, Directive 91 / 338 / EEC stipulates that the total amount of separators in final textile products shall not exceed 100 mg / kg, and the US Consumer Product Safety Improvement Act stipulates that the lead content in children’s products shall not exceed 100 mg. / kg. The test methods corresponding to the above textile heavy metal limit regulations generally use atomic abso...

Claims

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Application Information

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IPC IPC(8): G01N23/223G01N1/28
Inventor 吴俭俭陈海相赵珊红谢维斌孙国君阮毅刘婷李丹
Owner THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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