Method for determining content of lead in leather material, and special cutting and preforming device for method

Abstract

The invention discloses a method for determining the content of lead in a leather material, and a special cutting and preforming device for the method. The method comprises the following steps: firstly, cutting to-be-determined leather into strip-shaped materials with equal width; secondly, putting the strip-shaped materials into a cutting device, cutting and preforming through different folding layers to produce a plurality of groups of to-be-determined samples with different thicknesses; then putting the to-be-determined samples into an X-ray fluorescence spectrometer which is used for determining the to-be-determined samples and measuring the content of lead in each group of to-be-determined samples, averaging from the value, tending to be stable, of the content of a plurality of groups of lead; then turning the to-be-determined samples, measuring the value of the content of lead on the back side through the mode, and similarly averaging from the value, tending to be stable, of the content of a plurality of groups of lead; finally, averaging from two groups of averages, namely the value of content of lead in the leather material. According to the technical scheme, compared with the traditional microwave digestion-ICP method, and by utilizing the characteristic of the X-ray fluorescence spectrometer, the invention provides a novel method for directly determining lead in the leather material by adopting the X-ray fluorescence spectrometer, thus being a fast and effective testing method with nondestructive sample characters.

Description

Technical field: [0001] The invention relates to the technical field of leather measuring methods, in particular to a method for measuring lead content in leather materials and a special cutting and pressing device thereof. Background technique: [0002] According to the Consumer Product Safety Commission (CPSC Consumer Product Safety Association) CPSIA H.R.4040 Act and Restriction of the use of certain Hazardous Substances (RoHS Restriction of Hazardous Substances Directive), the lead content in leather and its products is restricted. That is to say, the lead content in all leather products must be limited, so that the lead content in leather products must be tested. [0003] At present, the method commonly used to detect the lead content in leather products is the microwave digestion-ICP method. The principle of this method is: grind the leather sample to be determined, then put the ground sample into the digestion tank, add an appropriate amount of acid solution in the d...

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Problems solved by technology

[0004] It can be seen from the above description that the current microwave digestion-ICP detection procedure is not only tedious and time-consuming, but also requires destructive treatment of samples

This method has increasingly restricted the detection efficiency in the current detection process, and cannot meet the current needs. For this, the inventor once proposed to use the EDXRF (X-ray Fluorescence Analyzer) method, which not only consumes Short time and relatively low detection cost

The EDXRF analysis method is usually used in the determination of soil heavy metals, metal coatings and other design metals. There are certain limitations in the application of leather. Due to the high penetration of X-rays, the final recorded spectrum not only includes The spectrum of the sample is not included, and it also contains the spectrum of a large number of background elements in the sample, resulting in the final measured lead metal content may be higher than the actual content, resulting in a large error in the measured value of the product

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