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Analyzing method of investigating copper ion content in 'chemical processed reed leaf'

An analytical method and technology of copper ions, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. and other problems, to achieve the effect of accurate results, simple procedures and less sampling

Inactive Publication Date: 2006-11-29
吴康
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AI Technical Summary

Problems solved by technology

[0006] It can be seen from the above reports that the current detection of copper ion content in "chemical Zongye" only stays on physical methods, which cannot be accurately qualitative and quantitative; and the chemical methods used in the labor

Method used

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Examples

Experimental program
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Example Embodiment

[0021] Example 1

[0022] Weigh 10 grams of "chemical rice dumpling leaves", shred them and put them in a beaker, add 80 ml of 5% hydrochloric acid, heat and boil for 15 minutes, remove and cool, and dilute to 100 ml with distilled water. Pipette 1 ml of sample solution into a colorimetric tube, add a few drops of 20% ammonium citrate solution, 1 ml of 20% sodium sulfite solution (or 4 drops of 20% hydroxylamine hydrochloride solution) 2 drops of thymol blue indicator, hydrochloric acid and lemon Adjust the pH of the ammonium acid solution to 1~2 (the solution just turned orange-red), add 2 ml of 0.002% dithizone carbon tetrachloride solution and shake vigorously for 2 minutes to compare the color with the standard series.

[0023] Standard series: Divide the copper standard solution equivalent to 0, 0.2, 0.5, 1.0, 1.5, 2.0, 3.0, 4.0 micrograms, and prepare according to the operating procedures.

[0024] According to the colorimetric results, the sample is between 1.5 micrograms a...

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Abstract

The invention relates to an analyzing method for detemining the copper ion content in 'chemical glutinous rice dumpling leaf', especially relating to an analyzing method for detemining the copper ion content in 'chemical glutinous rice dumpling leaf' by thizone colorimetry. And it does not use expensive instruments but directly adopts universal pipette, beaker, funnel, dissolving tube, colorimetric tube, balance, etc, and dissolves copper ions in the chemical glutinous rice dumpling leaf with acid, adds in various reagents and achieves a purpose of making colorimetry with standard object after impurities are separated. And its technical solution: heating the 'chemical glutinous rice dumpling leaf' with HCl and dissolving copper salts adhering to the chemical glutinous rice dumpling leaf and forming copper ions, then extracting them by dithizone from 0.05-0.5mol/L HCl solution into tetrachloride carbon and finally determining by colorimetry. And the invention has beneficial effects of less sampling quantity, simple and convenient procedure, accurate result and practicality.

Description

Technical field [0001] The invention relates to an analysis method for measuring copper ion content in "chemical zong leaves", in particular to an analysis method for dithizone colorimetric determination of copper ion content in "chemical zong leaves". Background technique [0002] The full text of the article "How to Identify "Chemical Zongye"" written by Xi Huize on May 9 this year in Xinmin Evening News in Shanghai, China is as follows: [0003] The latest test results from the light industry food quality supervision department broke the news again. The agency has set up 8 quality inspection stations across the country, and has randomly checked more than 100 zongzi leaves for consumers. The amount generally exceeds the standard, and it is not uncommon to exceed the standard by 30 to 50 times. The highest competition reaches 1500 mg / kg! The "(Hygienic Standard for Copper Limit in Food") stipulates that the copper content in food should be ≤ 10 mg / kg. [0004] The reason w...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 吴艺豪
Owner 吴康
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