Method for determining content of cadmium in Pd950 ornament

Abstract

The invention relates to a method for determining the content of cadmium in a Pd950 ornament. The method is characterized by comprising the following steps of carrying out microwave digestion by nitrohydrochloric acid, enabling the volume to be constant, determining by an ICP (Inductively Coupled Plasma) spectrograph and the like, so as to determine the content of the cadmium in the Pd950 ornament rapidly and accurately. According to the method, the disadvantages of a sample treatment and detection method in the prior art are overcome; the consumed time is short, the dosage of reagents is small and the loss of elements to be detected of samples is small; the accuracy of an analysis result is high, the harm to operating personnel is small and the operation is easy.

Description

technical field [0001] The invention relates to the field of precious metal jewelry, in particular to a method for detecting cadmium content in Pd950 jewelry. Background technique [0002] Toxic metals such as cadmium in Pd950 jewelry will be corroded by human sweat and slowly diffuse into the skin. Cadmium will damage the immune, reproductive, nervous and other systems of the human body, and even cause cancer. The international community attaches great importance to the hazards of cadmium. The European Union's WEEE Directive (2002 / 96EC) and RoHS Directive (2002 / 95 / EC) have made strict regulations and restrictions on cadmium content. my country's "Regulations on Limits of Harmful Elements in Jewelry" standard (GB28480-2012) requires that the content of cadmium in jewelry must be less than 0.1%, and the detection of cadmium in jewelry has attracted more and more attention. [0003] In China, the cadmium content in jewelry is generally tested according to the standards of "X-...

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Problems solved by technology

X-ray fluorescence spectrometry is greatly affected by factors such as coating or chemical treatment on the surface of the sample, shape, detection time, detection area, uniformity, spectral interference, etc., and has high requirements for chemical sample preparation; using inductively coupled emission spectrometry (ICP- When testing cadmium by AES, the method of heating and digesting with ordinary electric hot plate is used, and the specific microwave digestion conditions are not given. Not only the labor intensity is high, the time is long, the amount of reagents is large, and the cadmium is easy to be lost, which affects the analysis. The accuracy of the results. In addition, the standard comparison method is used for the determination, which is not as accurate as the standard curve method.

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