Method for performing accurate quantitative analysis on metal elements

Abstract

The invention relates to the field of analytical chemistry, in particular to a method for performing accurate quantitative analysis on metal elements by a patent technology combining a standard addition method and a differential method during accurate quantification. According to the analysis method, the standard addition method and the differential method are combined; a standard curve concentration calculation formula based on the differential method is designed; in combination with software calculation, a standard curve is established by using the standard addition method; the efficiency ofpreparing the standard curve is improved; and the interference caused by the matrix effect is effectively reduced, so that accurate quantification of the metal elements is realized. According to themethod, the calculated amount of preparing the standard curve by using the traditional standard addition method is greatly reduced, so that the quantitative analysis precision and speed of the harmfulmetal elements are improved; the standard addition method can replace the standard curve method (an external standard method); the accurate quantification method for the metal elements can be appliedto the detection of batch samples; and the method serves as a method for efficiently measuring the element concentration when a used instrument measures a special device without 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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