Method for quickly and sensitively detecting contents of various elements in salt

Abstract

The invention provides a method for quickly and sensitively detecting the contents of various elements in salt. The method comprises the following steps: (1) filling a column with maleic rosin glyceryl acrylate macroporous adsorption resin to prepare a solid-phase extraction cartridge; (2) allowing a salt solution to pass through the solid-phase extraction cartridge prepared in the step (1) at a flow velocity of 1.0-2.0 mL / min; (3) leaching the solid-phase extraction cartridge with a 30% ethanol solution; (4) eluting the solid-phase extraction cartridge with acetic acid and collecting eluate flowing out from the solid-phase extraction cartridge; and (5) determining the collected eluate by using atomic absorption spectrometry and carrying out quantitative and qualitative analysis on various elements in the eluate. The detection method provided by the invention is simple and convenient in determination, can overcome interference caused by the salt effect of the salt, and is capable of rapidly and accurately detecting various mineral elements and heavy metal elements in salt at the same time.

Description

technical field [0001] The invention belongs to the technical field of food element content detection, and in particular relates to a method for rapidly and sensitively detecting the content of various elements in table salt. Background technique [0002] The food industry is a lifeline industry related to the national economy and people's livelihood, and it is also an important symbol of a country's economic development level and people's quality of life. Edible salt industry, as an important branch of the food industry, is a kind of seasoning widely used in food. It is a necessity in people's life and plays an important role in people's dietary life. There are many kinds of edible salt in my country. In addition to raw salt and refined salt, there are also special salts based on refined salt with various trace elements or nutrients added, such as low-sodium salt, iodized salt, zinc-added salt, and selenium-added salt. [0003] Salt is a necessary seasoning for everyone in...

AI Technical Summary

Problems solved by technology

The state has strict regulations on the content of heavy metals in commercial salt, but there are no clear regulations on the content range, nutrition and safety of most mineral elements in commercial salt, especially the so-called fortified nutrient salt

Due to the complexity of the matrix components in table salt and the diversity of content changes, especially the special salt effect of sodium chloride in the matrix, it will seriously interfere with the testing of spectral instruments, resulting in large deviations in measurement results, resulting in the inability to simultaneously measure The content of mineral elements and heavy metal elements in table salt is accurately measured

[0004] Yang Zhen and others proposed a method for the rapid determination of trace elements in table salt by X-ray fluorescence spectrometry, and calculated the content of trace elements in table salt by setting the K value, but the calculation process was complicated and the instrument detection process brought Errors lead to large deviations in trace element content after calculation, and the calculation method is complicated, mainly used for the determination of metal elements and harmful elements in table salt; China Salt Haolong Salt Chemical Co., Ltd. has developed a method to detect ferric citrate in green table salt The method of ammonium content, by preparing standard solution of ammonium ferric citrate, and setting different upper and lower limit concentration ranges for absorbance measurement, by controlling the absorbance within the range of endpoints, to detect whether the content of ammonium ferric citrate is up to standard, this method adopts spectroscopic The absorbance is measured by a photometer. The standard solution needs to measure the absorbance many times and take the average value. Due to the error of the instrument itself and multiple operations, it is easy to cause the measurement result to be outside the endpoint range, and the deviation is large.