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The sample is digested by a wet method and evaporated to near dryness. The residue is dissolved and dissolved to make a mother liquid, and the residue is directly measured and the amount of the mother liquid is taken, and the mixture is directly diluted with the solution and the solution, and the method is directly determined. When the precision is expressed by the coefficient of variation, the recoveries of the spiked samples are less than 95%.
The determination results of the above mineral elements in the standard reference material of cabbage are in good agreement with the standard values ​​of the certificate.
The method has the advantages of simple and rapid operation, high sensitivity precision and high precision.
To provide some new and useful information for further study on the nutritional and medicinal value of wild purslane.
Determination of Spinach Zhongqiu Hongmei Chen Xiangying Li Xuehui Shenzhen Health and Epidemic Prevention Station by Graphite Furnace Atomic Absorption Spectrometry Establish an accurate and simple method for determining the error of spinach in the National Bureau of Standards.
METHODS: The horizontal heating platform of Zechuan was used to determine the lead in spinach by using a Zeeman effect button background graphite furnace atomic absorption method to chlorinate magnesium nitrate as a matrix modifier.
As a result, the method reduces background absorption interference and ashing loss, and improves sensitivity to improve precision.
The method detection limit is 3 recovery rate. It is concluded that the method is accurate and reliable and has certain practical value.
Determination of Lead Interference and Elimination of Lead in High-Calcium Foods Liang Hongjie Liang Chunsui Guangdong Provincial Center for Disease Control aims to determine the interference of lead in calcium in high-calcium foods by graphite furnace atomic absorption spectrometry, and to promote the use of dihydrogen phosphate Amine dechlorination is used as a mixed matrix modifier to increase the ashing temperature and atomization temperature and to reduce gas phase interference due to molecular interference and atomization stages in the ashing stage.
Methods A series of sample liquids containing different concentrations of interfering ions and the same concentration of lead were prepared. The temperature conditions of the pure standard were selected, and the absorbance was measured by the instrument. The matrix was added with the phosphoric acid dihydrogenamine chloride to separate the phosphoric acid. The dihydroamine chlorination measures the ashing temperature or the atomization temperature to measure the absorbance and calculate the recovery.
Results According to the measured recovery rate and background absorption, it was determined that the dihydrogenamine dichloride was used as a matrix modifier to inhibit the interference of calcium and error.
Conclusion With the selected mixed basis modifier, the results obtained by measuring the standard are in accordance with the indication range. The watermark and the slope of the standard curve containing the matrix are consistent, indicating that the addition of the matrix into the matrix during the error detection can inhibit the calcium contained within the matrix. effect.
However, as the calcium concentration increases, the background absorption signal increases and the matrix composition is complex. At this time, the standard addition method should be used.
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