CN1869665A - Analyzing method of investigating copper ion content in 'chemical processed reed leaf' - Google Patents
Analyzing method of investigating copper ion content in 'chemical processed reed leaf' Download PDFInfo
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- CN1869665A CN1869665A CN 200610085126 CN200610085126A CN1869665A CN 1869665 A CN1869665 A CN 1869665A CN 200610085126 CN200610085126 CN 200610085126 CN 200610085126 A CN200610085126 A CN 200610085126A CN 1869665 A CN1869665 A CN 1869665A
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- glutinous rice
- copper ion
- rice dumpling
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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
Affiliated technical field
The present invention relates to the analytical approach of investigating copper ion content in a kind of " chemical processed reed leaf ", the analytical approach of content of copper ion in particularly a kind of dithizone colorimetric estimation " chemical processed reed leaf ".
Background technology
Chinese Shanghai " Xinmin Evening News " habit in 9 days Mays in this year Hui Ze writes articles " how discerning " chemical processed reed leaf " " to the contents are as follows in full:
From the quick-fried again news of the up-to-date testing result of light industry and food quality supervised department, this mechanism is provided with 8 quality inspection stations throughout the country altogether, spot-check rice-pudding leaf of censorship pyramid-shaped dumpling more than 100 parts for the consumer altogether, the copper content that detects generally exceeds standard, exceed standard 30～50 times unrare, the highest competing reaches 1500 milligrams/kilogram! And " (in the food copper limit the quantity of hygienic standard " regulation, the content of copper should≤10 milligrams/kilogram in the food.
The pyramid-shaped dumpling wrappage why can cupric, and reason is that supplier is the green appearance that keeps fresh rice-pudding leaf, adopts chemicalses such as copper sulphate, cupric chloride to soak with artificial " enlarging afforested area ".
Look is distinguished in " chemical processed reed leaf " discriminating conduct: quick-frozen pyramid-shaped dumpling, vacuum pyramid-shaped dumpling, shortening pyramid-shaped dumpling, adding man-hour must thermophilic digestion, so can not present bud green color again.Color and luster is bud green and uniform, is " chemical processed reed leaf " mostly.Distinguish flavor: rice-pudding leaf seems bud green, but pyramid-shaped dumpling goes into pot and return to boil and do not have that burst of natural rice-pudding leaf delicate fragrance, even also has light Sulfur flavor, and this type of pyramid-shaped dumpling obviously also adopts " chemical processed reed leaf " mostly.Distinguish to boil water: if rice-pudding leaf is through chemical treatment, and color is relatively stable, and after the heating, the change color of water is little or present slight green; Green color as water is apparent in view, illustrates that its chemical raw material content is very high; And after the pyramid-shaped dumpling that primary colors rice-pudding leaf the packs heating, water can present faint yellow.
As can be seen, for the detection of content of copper ion in " chemical processed reed leaf ", only rest on the physical method at present from above-mentioned report, these class methods are qualitative and quantitative accurately; And enter the chemical method that adopts in the laboratory because analytic process is numerous and diverse, instrument is valuable to make the accident of current " chemical processed reed leaf " measure content of copper ion to it, does not temporarily also have accurately qualitative, accurate quantitative fast and convenient method.
Summary of the invention
The also incomplete deficiency of copper ion assay method in existing in order to overcome " chemical processed reed leaf ", the objective of the invention is in order to provide a kind of ratio faster and accurate analytical method, this analytical approach without expensive instrument directly adopt general Chemical Analysis Lab general in transfer pipet, beaker, funnel, dissolving pipe, color comparison tube, it equality, by the copper ion in rice-pudding leaf is dissolved with acid, add all ingredients, reach impurity and separate back and reference material colorimetric purpose.
The technical solution adopted for the present invention to solve the technical problems is: " chemical processed reed leaf " is bonded at mantoquita on " chemical processed reed leaf " with the hydrochloric acid heating for dissolving, form copper ion, borrow colourimetry to measure after in 0.05～0.5mol/L hydrochloric acid solution, being extracted into carbon tetrachloride solution with dithizone then, palladium, gold, silver, mercury and bismuth also react with dithizone with this understanding, but these constituent contents are very low, plumbous, zinc and cadmium can allow several milligrams to exist noiselessly, and procedure of test is as follows:
Main agents:
The copper standard solution takes by weighing 0.0500 gram fine copper silk and is dissolved in a small amount of rare nitric acid, is evaporated near doing, and adds 4 milliliters of concentrated hydrochloric acids and number ml water, boils, and moves in 500 milliliters of volumetric flasks, and is diluted to scale with water.Every milliliter of cupric of this solution 100 micrograms.
Get above-mentioned solution is diluted to every milliliter of cupric 1 microgram with 0.05M hydrochloric acid standard solution.Join with stylish.
Ammonium citrate solution 20% is purified with dithizone.
Sodium sulfite solution 20% is purified with dithizone.
Thymol blue indicator 0.05%
Dithizone stock solution 0.02% carbon tetrachloride solution.
Dithizone working fluid 0.002% forms stock solution for 10 times with the phenixin dilution.
Operating performance:
Take by weighing " chemical processed reed leaf " 10 gram, it is torn up put into beaker and add 80 milliliters of 5% hydrochloric acid, heated and boiled 15 minutes is taken off cooling, with distilled water diluting to 100 milliliter.Draw 1 ml sample solution in color comparison tube, add several 20% ammonium citrate solutions, 2 of 1 milliliter of (or 4 20% oxammonium hydrochloride solution) thymol blue indicator of 20% sodium sulfite solution, regulate pH to 1～2 (it is orange red that solution just has been) with hydrochloric acid and ammonium citrate solution, add behind 2 milliliters of the 0.002% dithizone carbon tetrachloride solutions firmly jolting 2 minutes, with the standard series colorimetric.
Standard series: branch is got the copper standard solution and is equivalent to 0,0.2, and 0.5,1.0,1.5,2.0,3.0,4.0 micrograms reach colour developing by operating performance, and its color range should be obvious.
The invention has the beneficial effects as follows that sampling amount is less, simple procedure, the result is accurate, has practicality.
Embodiment:
Embodiment 1
Take by weighing " chemical processed reed leaf " 10 gram, it is torn up put into beaker and add 80 milliliters of 5% hydrochloric acid, heated and boiled 15 minutes is taken off cooling, with distilled water diluting to 100 milliliter.Draw 1 ml sample solution in color comparison tube, add several 20% ammonium citrate solutions, 2 of 1 milliliter of (or 4 20% oxammonium hydrochloride solution) thymol blue indicator of 20% sodium sulfite solution, regulate pH to 1～2 (it is orange red that solution just has been) with hydrochloric acid and ammonium citrate solution, add behind 2 milliliters of the 0.002% dithizone carbon tetrachloride solutions firmly jolting 2 minutes, with the standard series colorimetric.
Standard series: branch is got the copper standard solution and is equivalent to 0,0.2, and 0.5,1.0,1.5,2.0,3.0,4.0 micrograms are by the operating performance preparation.
Through the colorimetric result, this sample is judged as 1.7 micrograms between standard series 1.5 micrograms and 2.0 micrograms, calculates by following formula:
Calculate content of copper ion milligram/kilogram=1.7 * 10=17 by above-listed formula.By " in the food copper limit the quantity of hygienic standard " regulation, copper content should≤10 milligrams/kilogram in the food.Present embodiment can be declared defective.
Claims (1)
1. the analytical approach of content of copper ion in the dithizone colorimetric estimation " chemical processed reed leaf ", it is characterized in that " chemical processed reed leaf " is bonded at mantoquita on " chemical processed reed leaf " with the hydrochloric acid heating for dissolving, form copper ion, measure by means of colourimetry after in 0.05～0.5mol/L hydrochloric acid solution, being extracted into carbon tetrachloride solution with dithizone then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610085126 CN1869665A (en) | 2006-05-27 | 2006-05-27 | Analyzing method of investigating copper ion content in 'chemical processed reed leaf' |
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| CN 200610085126 CN1869665A (en) | 2006-05-27 | 2006-05-27 | Analyzing method of investigating copper ion content in 'chemical processed reed leaf' |
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| CN1869665A true CN1869665A (en) | 2006-11-29 |
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| CN 200610085126 Pending CN1869665A (en) | 2006-05-27 | 2006-05-27 | Analyzing method of investigating copper ion content in 'chemical processed reed leaf' |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650300B (en) * | 2009-09-10 | 2011-04-06 | 安徽泰格生物技术股份有限公司 | Method for qualitatively detecting copper ions in sample |
| CN104544492A (en) * | 2014-10-02 | 2015-04-29 | 罗福仲 | Steamed rice dumpling leaf capable of removing free copper and preparation method thereof |
| CN110082348A (en) * | 2019-06-21 | 2019-08-02 | 福建农林大学 | A kind of method of rice Zn content rapid dyeing identification |
-
2006
- 2006-05-27 CN CN 200610085126 patent/CN1869665A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650300B (en) * | 2009-09-10 | 2011-04-06 | 安徽泰格生物技术股份有限公司 | Method for qualitatively detecting copper ions in sample |
| CN104544492A (en) * | 2014-10-02 | 2015-04-29 | 罗福仲 | Steamed rice dumpling leaf capable of removing free copper and preparation method thereof |
| CN104544492B (en) * | 2014-10-02 | 2016-05-18 | 罗福仲 | A kind of preparation method of rice-pudding leaf of removing free copper |
| CN110082348A (en) * | 2019-06-21 | 2019-08-02 | 福建农林大学 | A kind of method of rice Zn content rapid dyeing identification |
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Owner name: WU KANG Free format text: FORMER OWNER: WU YIHAO Effective date: 20090724 |
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Effective date of registration: 20090724 Address after: Room 2, unit 5, Dai Jie district, Jindong street, Jindong District, Zhejiang, Jinhua Province, 302, China: 321000 Applicant after: Wu Kang Address before: Room 2, unit 2, agriculture bank dormitory, 85 Chang An street, 404 Laguna Colorada Road, Wucheng District, Zhejiang, Jinhua Province, China: 321000 Applicant before: Wu Yihao |
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Open date: 20061129 |