Test sample for determining contents of lead and cadmium in table salt and preparation method of test sample

• Main Authors: LIU XIAOHUI, HUANG HAORAN, LIU YAPING, FANG SUILIAN, CAI YUQING, HONG JINGWEI, LIU WENWU
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention belongs to the technical field of food detection, and discloses a preparation method of a test sample for determining the content of lead and cadmium in table salt, and the preparation method comprises the following steps: adding a digestion solution into a table salt sample to be detected for digestion to obtain a digestion solution; adding a magnesium chloride solution into the digestion solution, uniformly mixing, adjusting the pH value of the solution to 7-8, and adding tetramethylammonium hydroxide to obtain a precipitate; and adding a nitric acid solution into the precipitate for dissolving to obtain a to-be-tested sample. The test sample for determining the content of lead and cadmium in salt can effectively avoid the influence of sodium ions on the determination of the content of lead and cadmium and reduce background interference so as to improve the stability and accuracy of the determination result of lead and cadmium. 本发明属于食品检测技术领域，公开了一种用于食盐中铅和镉含量测定的供试品的制备方法，包括如下步骤：在待测食盐样品中加入消解液进行消解得