Method for quantitatively detecting multiple heavy metals in leather at same time based on LIBS (Laser-Induced Breakdown Spectroscopy) technology

Abstract

The invention discloses a method for quantitatively detecting multiple heavy metals in leather at the same time based on an LIBS (Laser-Induced Breakdown Spectroscopy) technology. The method adopts an LIBS detecting system which is formed by a Q-switched pulse Nd:YAG (Yttrium Aluminum Garnet) laser, an echelle grating spectrometer, an ICCD (Intensified Charge-Coupled Device) detector, a rotating platform and the like. The method comprises the following steps: firstly, regulating laser energy by an energy attenuation system consisting of a half-wave plate and a laser Glan prism, gathering the laser energy on the surface of a sample which is fixed to the rotating platform through a focusing lens, and ablating, gasifying and ionizing substances on the surface of the detected sample, thus forming laser plasma; secondly, obtaining a spectral signal of the laser plasma through a spectrum collection system, analyzing and converting element types corresponding to a spectral line, and obtaining content information of characteristic elements through conversion; thirdly, obtaining concentrations of heavy metal elements by combining a CF (Calibration-free)-LIBS method according to the obtained information of the elements.

Description

Technical field [0001] The invention relates to a detection technology of heavy metals, in particular to a rapid detection method based on laser induced breakdown spectroscopy technology combined with a free calibration method for simultaneous and rapid quantitative detection of multiple heavy metals in leather. Background technique [0002] Leather products are commodities exported by Zhejiang Province, and their output value and export status are self-evident. Heavy metals are extremely harmful to the human body. Countries and regions such as the European Union and the United States have strict requirements for heavy metals in leather. According to the current detection methods, the annual cost is huge and it also takes a lot of time. In the past few years of work, we have found that the proportion of heavy metals such as Pb, Cd, Cr, etc. detected in footwear products is not high, which means that we have spent a lot of money and time in a risk rate. Things. [0003] At present...

AI Technical Summary

Problems solved by technology

In order to solve the problem that the existing laser-induced breakdown spectroscopy technology is usually only for inorganic solid samples, but it is difficult to detect organic samples

[0008] In order to solve the problem of complex and time-consuming technical procedures for detecting the content of heavy metal elements in leather, the technical solution adopted in the present invention is:

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