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Improved method for detecting zinc through atomic fluorescence spectrophotometer

An atomic fluorescence spectrophotometry, reducing agent technology, applied in the field of analysis and detection, can solve the problems of lack of stability of experimental data, poor reproducibility of experimental results, existence of memory effect, etc. little interference effect

Inactive Publication Date: 2016-03-09
GUANGZHOU PONY TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have shown that although this type of organic reagent has a sensitizing effect on the fluorescence intensity, it has a memory effect. Repeated measurements of the same mass fraction of zinc standard solution 10 times, the results have large deviations, the experimental data lacks stability, and the experimental results are reproduced. poor sex

Method used

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  • Improved method for detecting zinc through atomic fluorescence spectrophotometer
  • Improved method for detecting zinc through atomic fluorescence spectrophotometer
  • Improved method for detecting zinc through atomic fluorescence spectrophotometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 10 grams of crushed fresh cabbage sample into a 50mL porcelain crucible, add 1mL of 10% phosphoric acid, transfer it to a muffle furnace after carbonization on a low fire, ash at 500°C for 8 hours, take it out and cool it, add a small amount of 10% hydrochloric acid to dissolve And transfer it to a 50mL volumetric flask, add 1.25mL hydrochloric acid and 10mL 2.0% potassium thiocyanate solution, dilute to the mark with water and shake well, and do reagent blank and standard addition recovery experiments. Pipette 1mL, 2mL, 5mL, 8mL, 10mL of 1000μg / L zinc standard solution into a 50mL volumetric flask, add 1.25mL of hydrochloric acid and 10mL of 2.0% potassium thiocyanate solution, dilute to the mark with water and shake well, Prepare working curves of zinc standard solutions with mass fractions of 20 μg / L, 50 μg / L, 80 μg / L, 100 μg / L, and 200 μg / L, respectively. The fluorescence intensity of the working curve of the standard solution and the sample solution was measu...

Embodiment 2

[0040]Weigh 0.3 g of air-dried, crushed and sieved soil into a 50 mL polytetrafluoroethylene cup, add a small amount of water and 10 mL of hydrochloric acid to moisten the soil, volatilize at low temperature until about 2 mL remains, then cool, add 5 mL of nitric acid, 5 mL of hydrofluoric acid and 3 mL of perchloric acid Heat the flying silicon, add nitric acid hydrofluoric acid perchloric acid in proportion to continue flying silicon according to the digestion situation, until the content of the crucible is viscous, remove and cool, add 1mL nitric acid to dissolve the residue, transfer to a 50mL volumetric flask, add 1.25 Make mL of hydrochloric acid and 10 mL of 2.0% potassium thiocyanate solution, dilute to the mark with water and shake well, and do reagent blank and standard addition recovery experiments. Pipette 1mL, 2mL, 5mL, 8mL, 10mL of 1000μg / L zinc standard solution into a 50mL volumetric flask, add 1.25mL of hydrochloric acid and 10mL of 2.0% potassium thiocyanate s...

Embodiment 3

[0042] Take 25mL of tap water in a 50mL volumetric flask, add 1.25mL of hydrochloric acid and 10mL of 2.0% potassium thiocyanate solution, make the volume up to the mark with water and shake well, and do reagent blank and standard addition recovery experiments. Pipette 1mL, 2mL, 5mL, 8mL, 10mL of 1000μg / L zinc standard solution into a 50mL volumetric flask, add 1.25mL of hydrochloric acid and 10mL of 2.0% potassium thiocyanate solution, dilute to the mark with water and shake well, Prepare working curves of zinc standard solutions with mass fractions of 20 μg / L, 50 μg / L, 80 μg / L, 100 μg / L, and 200 μg / L, respectively. The fluorescence intensity of the working curve of the standard solution and the sample solution was measured with an atomic fluorescence spectrometer. After calculation, the zinc content in tap water was 54.7 μg / L, and the recovery rate was 97.7%.

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Abstract

The invention discloses an improved method for detecting zinc through an atomic fluorescence spectrophotometer, and belongs to the field of analysis and detection. The method comprises the steps that a working curve of a zinc standard solution containing 2.5% hydrochloric acid and 0.20% potassium thiocyanate is prepared; a solution containing 0.7% potassium hydroxide, 3.0% potassium borohydride and 0.0025% 1, 10-phenanthroline is prepared as a reducing agent; a 2.5% hydrochloric acid solution is prepared as carrying current. The method is applicable to detecting zinc content through the atomic fluorescence spectrophotometer to replace a special analysis reagent provided by an instrument company, and the problem that the black precipitate phenomenon or memory phenomenon which is insoluble in hydrochloric acid is generated when an improving agent reacts with potassium borohydride is avoided. The method is simple, reliable and low in interference, and has the low detection limit and high accuracy.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and relates to a method for detecting zinc by using an atomic fluorescence photometer. Background technique [0002] Zinc is an indispensable trace element for the growth and development of animals, plants and human body. If the intake of zinc is improper, the physiological functions of animals, plants or human body will be seriously damaged. Taking the human body as an example, zinc deficiency will affect various organs, causing various diseases such as decreased immunity, digestive system lesions, endocrine system disorders, respiratory system infections, abnormal brain development, and decreased reproductive ability; When the zinc content is too high, it will cause dizziness, nausea, diarrhea, vomiting and other symptoms. In severe cases, it may cause epilepsy and other mental diseases. Therefore, the analysis and determination of zinc is of great significance to life science, environmen...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6404
Inventor 宋薇李梅伍伟超关智维韦英
Owner GUANGZHOU PONY TESTING TECH
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