CN1811392A - Method for detecting ferric iron content in powder material - Google Patents
Method for detecting ferric iron content in powder material Download PDFInfo
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- CN1811392A CN1811392A CN 200610008144 CN200610008144A CN1811392A CN 1811392 A CN1811392 A CN 1811392A CN 200610008144 CN200610008144 CN 200610008144 CN 200610008144 A CN200610008144 A CN 200610008144A CN 1811392 A CN1811392 A CN 1811392A
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Abstract
The present invention relates to a semiquantitative detection method of ferric content in powder material. Said method includes the following steps: firstly, preparing various reagents required for developing color; respectively preparing standard sample and sample to be detected; then collecting original image information of developed standard sample and sample to be detected; comparing chromatic values of them to obtain ferric content range of sample.
Description
Technical field
The invention belongs to the detection technique field, particularly based on the detection method of ferric iron content in a kind of powder material of computing machine colourity identification.
Background technology
Asiderosis is a kind of global trophic disturbance disease, and this problem is particularly outstanding in developing country.In China, the iron deficiency phenomenon is ubiquity also.For addressing this problem, add after iodine, soy sauce adds iron continue salt, the Chinese government has taked to strengthen this behave of iron again in flour.It should be noted that the iron Excessive Intake also can cause super oxidative damage, cause angiocardiopathy, therefore, need monitor its content.The quantitative detecting method of iron mainly contains atomic absorption spectrography (AAS) and spectrophotometric method in the flour at present.The atomic absorption method sample preparation time is long, and apparatus expensive detects the cost height, is difficult for popularizing.And need earlier colorimetric again behind the treatments of the sample with spectrophotometric method, the sample preparation process is loaded down with trivial details, makes troubles to production.Stipulated a kind of qualitative checking method in addition among the AACC40-40, this method utilizes the reaction of iron and developer to make sample surfaces the characteristic of punctation occur, but the ferric iron in the qualitative detection sample.Spot characteristics according to naked-eye observation also can be done semi-quantitative analysis to the iron in the sample.This method is simple, speed is fast, but poor accuracy, subjectivity strong, lack unified standard.
Summary of the invention
The objective of the invention is limitation at prior art and proposed detection method based on ferric iron content in a kind of powder material of computing machine colourity identification.It is characterized in that the detection method of ferric iron content may further comprise the steps in the described powder material:
Step 1, the required reagent of preparation chromogenic reaction, this reagent is mixed by 1: 1 volume ratio by 2M hydrochloric acid and 10wt% potassium rhodanate solution;
Step 2, the standard model for preparing known ferric iron content, in the sample that has also recorded its intrinsic iron content without the iron reinforcement, add ferric iron hardening agent 10,20,30,40,50mg/kg respectively, the iron content of standard model is an intrinsic iron content and interpolation iron amount sum in the sample, the careful mixing, promptly get the standard model of known iron content;
Step 3, the standard model and the testing sample of known iron content of getting equivalent is stand-by, and the developer of getting step 1 again is to colour comparator, and the colour comparator that vibrates gently makes developer be uniformly distributed in the colour comparator bottom surface;
Step 4 is added to ready standard model and testing sample respectively in the colour comparator that developer is housed respectively, and the sample addition is advisable to be paved with the colour comparator bottom surface and can be soaked into by developer fully;
Step 5, sample place standard model and testing sample after the colour developing on the image acquisition device after leaving standstill reaction 10～25min, gather original image information;
Step 6, utilize computing machine to read the image information of standard sample, draw the relation curve of ferric iron content and chromatic value, the chromatic value for the treatment of test sample colour developing picture that passes through to be gathered and the chromatic value of standard sample colour developing picture compare, and draw the ferric iron content scope of sample.
Described ferric iron hardening agent is NaFeEDTA, ferric citrate or ferric pyrophosphate; They are for dissociateing the food ferrous-fortifier of ferric ion under sour environment.
Outside the described developer sulphur removal potassium cyanide solution, also has the material that produces depth different colours reactant with the ferric iron substance reaction of different content.
The invention has the beneficial effects as follows that on the basis of AACC40-40 detection method utilize potassium rhodanide to generate red complex with the ferric iron reaction under sour environment, and iron content is many more, the red complex color of generation is dark more.Within the specific limits, the weight of iron content and complexing product color presents good positive correlation.Sample after the processing is solid-state, and available scanner images acquired information based on the reflected light principle makes the image information of gained be more suitable for analyzing, and this method has been avoided the strong shortcoming of AACC40-40 detection method subjectivity, thereby has improved the precision that detects.Compare with traditional atomic absorption method and spectrophotometric method, it is simple that this method has sample preparation, detection speed is fast, required instrument cost is low, require low to the environmental baseline of measuring, free of contamination characteristics are suitable in powder product manufacturing enterprises such as flour, ground rice, milk powder and other need be to powder materials iron content especially and make the factory of sxemiquantitative fast detecting and promote.
Embodiment
The detection method of ferric iron content in a kind of powder material that the limitation that The present invention be directed to prior art has proposed to discern based on computing machine colourity.The detection method of ferric iron content may further comprise the steps in the described powder material:
Step 1, the required reagent of preparation chromogenic reaction, this reagent is mixed by 1: 1 volume ratio by 2M hydrochloric acid and 10wt% potassium rhodanate solution;
Step 2, the standard model for preparing known ferric iron content, in the sample that has also recorded its intrinsic iron content without the iron reinforcement, add ferric iron hardening agent 10,20,30,40,50mg/kg respectively, the iron content of standard model is an intrinsic iron content and interpolation iron amount sum in the sample, the careful mixing, promptly get the standard model of known iron content; Wherein the ferric iron hardening agent is: NaFeEDTA, ferric citrate or ferric pyrophosphate; They are for dissociateing the food ferrous-fortifier of ferric ion under sour environment.
Step 3, the standard model and the testing sample of known iron content of getting equivalent is stand-by, and the developer of getting step 1 again is to colour comparator, and the colour comparator that vibrates gently makes developer be uniformly distributed in the colour comparator bottom surface;
Step 4 is added to ready standard model and testing sample respectively in the colour comparator that developer is housed respectively, and the sample addition is advisable to be paved with the colour comparator bottom surface and can be soaked into by developer fully;
Step 5, sample place standard model and testing sample after the colour developing on the image acquisition device after leaving standstill reaction 10～25min, gather original image information;
Step 6, utilize computing machine to read the image information of standard sample, draw the relation curve of ferric iron content and chromatic value, the chromatic value for the treatment of test sample colour developing picture that passes through to be gathered and the chromatic value of standard sample colour developing picture compare, and draw the ferric iron content scope of sample.
Outside the described developer sulphur removal potassium cyanide solution, also has the material that produces depth different colours reactant with the ferric iron substance reaction of different content.Below be that the present invention will be described in detail for example with flour.
1. take by weighing the 10g potassium rhodanate, it is mixed with the solution that concentration is 10wt%; Get the hydrochloric acid solution that concentration is 2M again, respectively get the above-mentioned two kinds of solution of 10ml and evenly mix, promptly get developer.
2. the flour standard model for preparing known ferric iron content, add respectively in the flour of its intrinsic iron content that the iron equivalent is 10,20,30,40,50mg/kg strengthening without iron and recorded, ferrous-fortifier wherein is NaFeEDTA, ferric citrate or ferric pyrophosphate.For guaranteeing accuracy of detection, selected ferrous-fortifier should be identical with the hardening agent in the testing sample.The iron content of standard model is an intrinsic iron content and interpolation iron amount sum in the flour, and potpourri is carefully mixed, and promptly gets the flour standard model of known iron content.
3. flour standard model and the flour sample to be measured of getting known iron content are stand-by, and the sample amount of taking should pipette the 2.5mL developer to colour comparator greater than 6g, and the colour comparator that vibrates gently makes developer be uniformly distributed in the colour comparator bottom surface.
4. ready flour is added in the colour comparator that developer is housed, earlier a small amount of flour is added in the colour comparator, the flour addition is advisable to be paved with the colour comparator bottom surface and can be soaked into by developer fully.Beginning application of sample speed can not be too fast, to prevent the situation that bubble appears in dyeing inequality and coloured moiety.
5. after sample leaves standstill reaction 15min, standard model and testing sample after the colour developing are placed on the image acquisition device, gather original image information.
6. utilize computing machine to read the image information of standard model, draw the relation curve of ferric iron content and chromatic value, the develop the color chromatic value of picture of the chromatic value of the testing sample colour developing picture that passes through to be gathered and standard model compares, and draws the ferric iron content scope of sample.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. the detection method of ferric iron content in the powder material is characterized in that the detection method of ferric iron content may further comprise the steps in the described powder material:
Step 1, the required reagent of preparation chromogenic reaction, this reagent is mixed by 1: 1 volume ratio by 2M hydrochloric acid and 10wt% potassium rhodanate solution;
Step 2, the standard model for preparing known ferric iron content, in the sample that has also recorded its intrinsic iron content without the iron reinforcement, add ferric iron hardening agent 10,20,30,40,50mg/kg respectively, the iron content of standard model is an intrinsic iron content and interpolation iron amount sum in the sample, the careful mixing, promptly get the standard model of known iron content;
Step 3, the standard model and the testing sample of known iron content of getting equivalent is stand-by, and the developer of getting step 1 again is to colour comparator, and the colour comparator that vibrates gently makes developer be uniformly distributed in the colour comparator bottom surface;
Step 4 is added to ready standard model and testing sample respectively in the colour comparator that developer is housed respectively, and the sample addition is advisable to be paved with the colour comparator bottom surface and can be soaked into by developer fully;
Step 5, sample place standard model and testing sample after the colour developing on the image acquisition device after leaving standstill reaction 10～25min, gather original image information;
Step 6, utilize computing machine to read the image information of standard sample, draw the relation curve of ferric iron content and chromatic value, the chromatic value for the treatment of test sample colour developing picture that passes through to be gathered and the chromatic value of standard sample colour developing picture compare, and draw the ferric iron content scope of sample.
2. according to the detection method of ferric iron content in the described powder material of claim 1, it is characterized in that described ferrous-fortifier is: NaFeEDTA, ferric citrate or ferric pyrophosphate; They are for dissociateing the food ferrous-fortifier of ferric ion under sour environment.
3. according to the detection method of ferric iron content in the described powder material of claim 1, it is characterized in that outside the described developer sulphur removal potassium cyanide solution, also having the material that produces depth different colours reactant with the ferric iron substance reaction of different content.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610008144 CN1811392A (en) | 2006-02-22 | 2006-02-22 | Method for detecting ferric iron content in powder material |
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| CN 200610008144 CN1811392A (en) | 2006-02-22 | 2006-02-22 | Method for detecting ferric iron content in powder material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590202A (en) * | 2012-02-17 | 2012-07-18 | 天津市捷威动力工业有限公司 | Measuring method of iron |
| CN102866124A (en) * | 2012-09-14 | 2013-01-09 | 天津力神电池股份有限公司 | Method for testing Fe<3+> content of lithium iron phosphate |
| CN103323412A (en) * | 2013-05-30 | 2013-09-25 | 攀钢集团江油长城特殊钢有限公司 | Thiocyanate spectrophotometry method for detecting iron content of high-temperature alloy |
| CN109781930A (en) * | 2019-03-20 | 2019-05-21 | 金川集团股份有限公司 | Ferrimetry test paper in a kind of nickel electrowinning system solution |
| CN112945951A (en) * | 2021-03-21 | 2021-06-11 | 西北农林科技大学 | Method for color development determination of iron distribution and content of different parts of wheat grains |
-
2006
- 2006-02-22 CN CN 200610008144 patent/CN1811392A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590202A (en) * | 2012-02-17 | 2012-07-18 | 天津市捷威动力工业有限公司 | Measuring method of iron |
| CN102590202B (en) * | 2012-02-17 | 2014-06-04 | 天津市捷威动力工业有限公司 | Measuring method of iron |
| CN102866124A (en) * | 2012-09-14 | 2013-01-09 | 天津力神电池股份有限公司 | Method for testing Fe<3+> content of lithium iron phosphate |
| CN103323412A (en) * | 2013-05-30 | 2013-09-25 | 攀钢集团江油长城特殊钢有限公司 | Thiocyanate spectrophotometry method for detecting iron content of high-temperature alloy |
| CN103323412B (en) * | 2013-05-30 | 2015-07-22 | 攀钢集团江油长城特殊钢有限公司 | Thiocyanate spectrophotometry method for detecting iron content of high-temperature alloy |
| CN109781930A (en) * | 2019-03-20 | 2019-05-21 | 金川集团股份有限公司 | Ferrimetry test paper in a kind of nickel electrowinning system solution |
| CN112945951A (en) * | 2021-03-21 | 2021-06-11 | 西北农林科技大学 | Method for color development determination of iron distribution and content of different parts of wheat grains |
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