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Method for simultaneously and rapidly detecting contents of multiple heavy metal elements in salt

A technology for element content and heavy metals, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of spectral instrument test interference, accurate measurement of various heavy metal elements, deviation of results, etc., to achieve high accuracy and sensitivity, eliminate interference. Interference of heavy metal ion spectrometry and the effect of fast analysis

Inactive Publication Date: 2014-04-09
HUBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAUOF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many kinds of heavy metal elements in table salt, such as copper, zinc, lead, cadmium and barium, etc., but due to the special salt effect of table salt, it will interfere with the test of spectral instruments, which will cause a large deviation in the results, so that there is no way to simultaneously Accurately measure the content of various heavy metal elements in table salt
At present, there is no relevant detection standard for the simultaneous determination of the contents of various heavy metal elements in table salt in China. Therefore, how to overcome the salt effect and provide a method for simultaneously accurate and rapid detection of the contents of various heavy metal elements in table salt is the quality and safety inspection of table salt. important issues facing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Weigh 5g of table salt, add 1mL of heavy metal mixed standard solution (Cu=10μg / mL, Zn=10μg / mL, Cd=1μg / mL, Pb=10μg / mL, Ba=10μg / mL) to dissolve in water, dilute to In a 500mL volumetric flask, prepare a salt solution with a concentration of 0.01g / mL, that is, the standard addition level of each heavy metal ion in the table salt is Cu=2mg / kg, Zn=2mg / kg, Cd=0.2mg / kg, Pb= 2mg / kg, Ba=2mg / kg;

[0021] 2) Pour 500mL of common salt solution into the 732-type cation exchange resin column at a flow rate of 3.5mL / min to enrich sodium ions and heavy metal ions. The diameter of the 732-type cation-exchange resin column is 10mm to control the resin layer. The height is 10cm;

[0022] 3) Use 500mL of 0.1mol / L hydrochloric acid solution to elute the 732-type cation exchange resin column at a flow rate of 4.5mL / min to remove the sodium ions adsorbed on the 732-type cation-exchange resin;

[0023] 4) Use 100mL3mol / L hydrochloric acid solution to elute the 732-type cation exchange re...

Embodiment 2

[0027] 1) Weigh 7.5g of table salt, add 15mL of heavy metal mixed standard solution (Cu=10μg / mL, Zn=10μg / mL, Cd=1μg / mL, Pb=10μg / mL, Ba=10μg / mL) to dissolve in water, dilute to volume In a 500mL volumetric flask, prepare a salt solution with a concentration of 0.015g / mL, that is, the standard addition level of each heavy metal ion in the table salt is Cu=20mg / kg, Zn=20mg / kg, Cd=2mg / kg, Pb =20mg / kg, Ba=20mg / kg;

[0028] 2) Pour 500mL of common salt solution into the 732-type cation exchange resin column at a flow rate of 4mL / min to enrich sodium ions and heavy metal ions. The diameter of the 732-type cation-exchange resin column is 15mm, and the height of the resin layer is controlled to be 30cm;

[0029] 3) Use 500mL of 0.125mol / L hydrochloric acid solution at a flow rate of 5.5mL / min to elute the 732-type cation exchange resin column to remove the sodium ions adsorbed on the 732-type cation-exchange resin;

[0030] 4) Use 200mL of 2.5mol / L hydrochloric acid solution at a flo...

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Abstract

The invention discloses a method for simultaneously and rapidly detecting the contents of multiple heavy metal elements in salt. The method comprises the following steps: pouring a salt solution into a 732 type cation exchange resin column at a certain flow velocity, exchanging hydrogen ions on a sulfonic acid group of resin in the resin column with sodions and heavy metal ions in the salt, and enriching the sodions and heavy metal ions in a salt solution; eluting the sodions adsorbed on the 732 type cation exchange resin column by using a diluent hydrochloric acid solution, removing the sodions, eluting the heavy metal ions on special resin by using a concentrated hydrochloric acid solution, and collecting a receiving solution in the step; and finally, measuring the collected receiving solution by using an inductively coupled plasma emission spectrometer, and measuring the contents of various heavy metal elements in the receiving solution. According to the method, a salt effect of the salt is overcome, the content of multiple heavy metals in the salt can be simultaneously, accurately and rapidly detected, and the method has the advantages of simplicity in operation, high analysis speed, high accuracy, high sensitivity and the like.

Description

technical field [0001] The invention relates to a method for rapidly detecting the contents of multiple heavy metal elements in table salt simultaneously, and belongs to the field of food safety detection. technical background [0002] As we all know, heavy metal elements are quite harmful to the human body. Once heavy metal elements enter the human body and accumulate to a certain extent, they will coordinate with important substances in the human body, changing the normal physiological functions of the substance, and even entering the nervous system to interfere with the body. The normal function of the disease leads to pathological changes, which can lead to death in severe cases. Salt is one of the most important substances that humans depend on for survival, and it is also the most commonly used seasoning in cooking. Human beings must ingest a certain amount of salt every day in order to ensure the normal operation of the body. Therefore, it is very important to contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 陈建华陈魏胡德聪马晶晶陈志涛
Owner HUBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAUOF THE PEOPLES REPUBLIC OF CHINA
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