A method for precise quantitative analysis of metal elements

Abstract

The invention relates to the field of analytical chemistry, and more specifically relates to a method for precise quantitative analysis of metal elements using a patented technology combining a standard addition method and a differential method. This analysis method adopts the combination of standard addition method and difference method, and designs the standard curve concentration calculation formula based on the difference method. Combined with software calculation, the standard addition method is used to establish the standard curve, which improves the efficiency of preparing the standard curve and effectively reduces the matrix concentration. The interference caused by the effect, so as to realize the precise quantification of metal elements. This method greatly reduces the amount of calculation when using the traditional standard addition method to prepare a standard curve, thereby improving the accuracy and speed of quantitative analysis of harmful metal elements, so that the standard addition method can replace the standard curve method (external standard method), allowing metal elements to be accurately Quantitative methods can be applied to the detection of batch samples and as an efficient method of measuring element concentrations when the instrument used does not have a special device for measurement using the standard addition method.

Description

technical field [0001] The invention relates to the field of analytical chemistry, and more specifically relates to a patented precise quantitative analysis method for precise quantification of harmful metal elements using a standard addition method and a differential method. Background technique [0002] Metal elements are widely distributed in nature. Heavy metals represented by elements such as lead, cadmium, and mercury are used in various fields of production and in all aspects of life. However, due to some outstanding environmental problems, or some areas are producing areas of harmful metal elements, the detection and control of harmful metal elements in the environment and food are extremely important to ensure the health of the people. The standard curve method (external standard method) is suitable for the case where the matrix of the standard curve and the sample matrix are roughly the same. The advantage is that the analysis speed is fast. The disadvantage is tha...

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Problems solved by technology

[0004] In 2015, Qu Liangyi, Mai Jinhuan, Wang Xiao and others from the Guangdong Provincial Key Laboratory of Urban Water Cycle and Water Quality Safety published "Simultaneous Determination of Polychlorine for Drinking Water by Standard Addition Method Inductively Coupled Plasma Mass Spectrometry" in "Guangdong Chemical Industry" Arsenic, cadmium and lead in aluminum, the standard addition method is to take 6 equal volumes of the solution to be tested, add the same concentration and different volumes of the standard solution of the element to be tested from the second part, and then dilute it with a blank to the same volume. Volume, under the same experimental conditions, measure the signal strength of each solution in turn, and then draw a calibration curve of the signal strength against the added concentration. In the whole process of this method, the standard solution is put into six containers and then fixed to volume, and then measured on the machine, not only increases Therefore, the standard addition method is only used when the number of samples is small and the matrix is ​​relatively complex.

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