A method for judging the effective service life of graphite tubes in graphite furnace atomic absorption spectrometers

Abstract

The invention discloses a method for judging the effective life of a graphite pipe in a graphite furnace atomic absorption spectrometer. The method takes pumpkin powder as a quality control sample, and comprises the steps of carrying out microwave digestion pretreatment on the pumpkin powder; segmenting the use period of the new graphite pipe into different stages according to the sintering times, accumulating the data of lead content of the quality control sample detected by adopting a graphite furnace atomic absorption spectrometry, and calculating the population mean X and the population standard deviation sigma of the lead content of the quality control sample; drawing a quality control chart by taking X as a center line and X + / -2 sigma as an upper warning line and a lower warning line; when the lead content of the quality control sample exceeds the warning lines X + / -2 sigma, recording the sintering times of the graphite pipe, which is the maximum sintering times of the graphite pipe, and confirming by using the certified reference material of lead. The method is reasonable in design, economical, practical and simple and convenient to operate, and is capable of lowering experimental cost and guaranteeing the accuracy of testing results.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for judging the effective service life of a graphite tube in a graphite furnace atomic absorption spectrometer, more specifically, a method for judging trace elements such as lead in food by a graphite furnace atomic absorption spectrometer A method for the useful life of graphite tubes. Background technique [0002] In recent years, with the development of industrial technology, some harmful metal elements such as lead, cadmium, and copper have entered food. Due to the accumulation of these metals in the human body, they may have teratogenic, carcinogenic and mutagenic effects. Therefore, heavy metal pollution is one of the key areas of food safety supervision. Atomic absorption spectrometry (AAS) has the advantages of high sensitivity (ng / mL~pg / mL), high accuracy, high selectivity, and fast analysis speed, and is widely used in the detection of various heavy metal ...

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Problems solved by technology

At the same time, in the relevant research on the influence of graphite tube performance changes on the determination results of lead content in food, how to improve the processing technology to minimize the influence of external factors, choose appropriate and easily obtained verification, use certified In terms of solving technical problems such as reference materials and reducing the cost of certified reference materials, there are currently no relevant technical reports

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