Method for measuring content of copper in sodium chloride

Abstract

The invention discloses a method for measuring the content of copper in sodium chloride through an inductively coupled plasma atomic emission spectrometer and belongs to the technical field of chemical detection. The method comprises the steps of specimen pretreatment, adjusting of a dual-platinum-net atomizer, preparation of a copper element calibration curve and calculating of the precision degree, and thus the target of accurately detecting the content of copper in the sodium chloride is achieved. The measuring range of w(Cu) is 0.1*10<-6>~100*10<-6>. According to the method for measuring the content of copper in the sodium chloride, the detection technical problem of trace copper in the sodium chloride is solved, powerful technical support is provided for correctly selecting and evaluating a sodium chloride salt solution used for a salt spray test widely used internationally and predicting corrosion resistance and the service life of a paint film, and the advanced level of the detection field is reached.

Description

technical field [0001] The invention belongs to the technical field of chemical element detection, in particular to an inductively coupled plasma atomic emission spectrometer quantitative analysis method for copper content in sodium chloride, measuring range: w(Cu)0.1×10 -6 ~100×10 -6 . Background technique [0002] "Plasma Emission Spectroscopic Analysis" (edited by Xin Renxuan, Chemical Industry Press, first edition in January 2005), page 228 has the determination method of S, B, Na, Ca elements in seawater, and the spectrometer used is ARL 35000, not It involves the determination method of Cu element in seawater; page 231 has extraction and enrichment of trace elements in seawater. Although there is Cu element, it needs to be extracted and enriched with extremely toxic organic solvents. At the same time, it is necessary to add pyrrolidine disulfide amino Ammonium formate reagent, nitrobenzene diluent, etc., easy purity problems lead to increased blank value; page 232 ha...

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Problems solved by technology

[0002] "Plasma Emission Spectroscopic Analysis" (edited by Xin Renxuan, Chemical Industry Press, first edition in January 2005), page 228 has the determination method of S, B, Na, Ca elements in seawater, and the spectrometer used is ARL 35000, not It involves the determination method of Cu element in seawater; page 231 has extraction and enrichment of trace elements in seawater. Although there is Cu element, it needs to be extracted and enriched with extremely toxic organic solvents. At the same time, it is necessary to add pyrrolidine disulfide amino Ammonium formate reagent, nitrobenzene diluent, etc., easy purity problems lead to increased blank value; page 232 has the separation, enrichment and determination of trace elements in saturated refined brine, and the saturated refined brine is evaporated to dryness, because the evaporation process is long , It is easy to cause the occurrence of pollution phenomena such as the stripping of trace elements in the container, and does not involve the determination method of Cu element in saturated refined brine; there is no method for preparing the calibration curve of copper element using sodium chloride sample

There are no current and effective national standards, industry standards, local standards, and enterprise standards for chemical analysis of copper content in sodium chloride

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