CN203117142U - Device for detecting content of formaldehyde in food - Google Patents
Device for detecting content of formaldehyde in food Download PDFInfo
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- CN203117142U CN203117142U CN 201320016957 CN201320016957U CN203117142U CN 203117142 U CN203117142 U CN 203117142U CN 201320016957 CN201320016957 CN 201320016957 CN 201320016957 U CN201320016957 U CN 201320016957U CN 203117142 U CN203117142 U CN 203117142U
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Abstract
The utility model discloses a device for detecting the content of formaldehyde in food. The device comprises a pH electrode, an analog-digital converter, a processor, a memory and a display, wherein the signal output end of the pH electrode is connected with the signal input end of the processor through the analog-digital converter; the display signal output end of the processor is connected with the display; and the data communication end of the processor is connected with the memory. By using the device, the content of formaldehyde in food can be detected rapidly, efficiently and accurately.
Description
Technical field
The utility model relates to the Fast Detection Technique to noxious material in the food, is specifically related to a kind of pick-up unit of formaldehyde in food content.
Technical background
Formaldehyde is a kind of protoplasm poisonous substance that destroys biological cell protein, can people's skin, respiratory tract and internal organ be caused damage, and anesthesia people's nervous centralis can cause pulmonary edema, hepatic coma, kidney failure etc.The World Health Organization (WHO) confirms that formaldehyde is teratogenesis, carcinogen, is allergen, and long-term contact will cause gene mutation.Formaldehyde pollution problem at present mainly concentrates in room, textile and the food.Contain a large amount of Lauxites based on formaldehyde in the artificial boards such as the scale board in indoor decoration material and the furniture, fiberboard, particieboard, all contain formaldehyde in all kinds of paint, the coating.Textile uses the N-methylol compound that contains formaldehyde as resin finishing agent in process of manufacture, to increase the elasticity of fabric, improves crapyness, also uses the resin cation that contains formaldehyde to improve dyefastness, causes formaldehyde residue problem in the textile.In addition, because economic interests are ordered about, some lawless persons are food additives with formaldehyde, as water-soaked food add formaldehyde anticorrosion with coagulated protein, improve outward appearance, increase mouthfeel, adding formaldehyde in the inebriant prevents muddiness, increases transparency, these all can cause the severe contamination of food, the infringement health.Expressly provided in " Food Hygiene Law of the People's Republic of China " and forbidden that formaldehyde is as food additives.This shows that the formaldehyde pollution problem has spread to each corner in the life, the serious threat health should cause showing great attention to of people.Content of formaldehyde has become an important safety index of pollution monitoring in current room, textile, the food.Therefore study that a kind of citizen can independently finish in the own home, easy, sensitive, quick, directly perceived, accurate, economic formaldehyde detection method will have very big market outlook.
Along with improving constantly of people's living standard, the requirement of daily life condition is also improved constantly, yet the intoxicating phenomenon of formaldehyde also constantly increase, the serious harm people's is healthy.The formaldehyde detection method mainly contains spectrophotometric method, electrochemical assay, vapor-phase chromatography, liquid phase chromatography, sensor method and titrimetry etc. at present.The material that spectrophotometric method is based on different molecular structures absorbs the selectivity of electromagnetic radiation and a kind of qualitative, the quantitative analysis method of setting up, and is that the most conventional a kind of method is detected in room, textile, formaldehyde in food.Electrochemical methods is based on the variation of the electric current (voltammetry) that produces in the chemical reaction, electric weight (coulometry), current potential (potential method), judges the method that the concentration of analyte in the reaction system is carried out quantitative test.Vapor-phase chromatography be formaldehyde under acid condition, be adsorbed on scribble 2,4-dinitrophenylhydrazine (2,4-DNPH) on 6201 carriers, generate stable formaldehyde hydrazone.Behind the carbon disulphide wash-out, separate through OV-chromatographic column, measure with hydrogen flame ionization detector.Liquid phase chromatography is that (2,4-DNPH) absorption generates 2,4-nitro phenylhydrazone to formaldehyde, uses CHCl by 2,4-dinitrophenylhydrazine under acid condition
3Extract, concentrate, with first alcohol and water (methyl alcohol: water=6: 4) take off and wash SiCl
8Post separates, and ultraviolet 360nm measures at the place.Sensor for detection of formaldehyde has electrochemical sensor, optical sensor and photoproduction sensor etc., electrochemical sensor is relatively simple for structure, cost is lower, and wherein high-quality properties of product are stable, and measurement range and resolution can reach the requirement of Indoor Environment Detection substantially.Titrimetry is exactly with excessive a certain material and formaldehyde reaction, and then makes it to react completely with other these excessive materials of a certain material titration, and writes down volume and the concentration that expends this material this moment, calculates then, releases the content of formaldehyde at last.
Yet all there is such or such problem in these methods, though spectrophotometric method is easy and simple to handle, and stable performance, error is little, is not subjected to the interference of acetaldehyde, but colored solutions stable existence 12 hours.Advantages such as it is strong that the gas chromatography detection compound has an antijamming capability, easy and simple to handle, but detection limit is lower, therefore often is used as the standard detecting method of compound.The suffered interfering material of sensor method is many, and owing to electrolyte and tested formaldehyde gas generation irreversible chemical reaction are consumed, so its mission life is generally shorter.The optical sensor price comparison is expensive, and volume is bigger, is not suitable for online real-time analysis, and the popularity of its use is restricted.Though the photoproduction sensor has improved selectivity, because activity and the other factors of enzyme cause the sensor instability, lack practicality, and the selling at exorbitant prices of general formaldehyde gas sensor, be difficult to popularize.Titrimetry is difficult to control, and the error of calculation is relatively large, is subjected to the influence of extraneous factor easily.
The utility model content
The purpose of this utility model is at above-mentioned technical matters, and a kind of pick-up unit of formaldehyde in food content is provided, and this method and apparatus can detect the content of formaldehyde in food fast, efficiently, accurately.
For realizing this purpose, the pick-up unit of the formaldehyde in food content that the utility model is designed, it comprises pH electrode, analog to digital converter, processor, storer and display, wherein, the signal output part of described pH electrode connects the signal input part of processor by analog to digital converter, the demonstration signal output part of processor connects display, the data communication end connected storage of processor.
Also be provided with wave filter between described pH electrode and the analog to digital converter.
Compared with prior art, the utlity model has following advantage:
1, the utility model directly draws the content of formaldehyde by the variation of the reaction generation pH value of sodium sulphite and formaldehyde according to the variation of pH value.
2, the utility model is broken previous qualitative analysis with the sodium sulphite PARA FORMALDEHYDE PRILLS(91,95), directly carries out quantitative Treatment with the sodium sulphite PARA FORMALDEHYDE PRILLS(91,95) without other chemical reagent, draws the content of formaldehyde in the original solution.
3, the utility model is simple to operation, does not need large-scale instrument, only needs some simple chemical reagent, does not have complicated chemical reaction, and is easy, and cheapness can more accurately be measured the content of formaldehyde at normal temperatures.
4, the utility model is highly sensitive, and error is less relatively, and suffered interfering material is few.
In sum, little, the technology of investment of the present utility model simple, without the need for certain conditions, easy to operate, the content that can detect formaldehyde more fast and accurately.
Description of drawings
Fig. 1 is first group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 100,000 times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 2 is second group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 12.5 ten thousand times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 3 is the 3rd group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 200,000 times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 4 is the 4th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 250,000 times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 5 is the 5th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 500,000 times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 6 is the 6th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 62.5 ten thousand times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 7 is the 7th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution behind 1,000,000 times the formalin dilute solution, add the graph of a relation between formalin dilute solution volume and the pH at every turn;
Fig. 8 is the relation between formaldehyde quality and the pH value;
Fig. 9 is the structural representation of pick-up unit of the present utility model;
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Formaldehyde in food content detection device as shown in Figure 9, it comprises pH electrode, analog to digital converter, processor, storer and display, the signal output part of pH electrode connects the signal input part of processor by analog to digital converter, the demonstration signal output part of processor connects display, the data communication end connected storage of processor.The various quality of above-mentioned formaldehyde and the linear relationship y=1*10 of corresponding pH value
9x
5+ 9*10
7x
4-2*10
6x
3-40348x
2+ 529x+9.73 is stored in the storer.
In the technique scheme, in order to guarantee the quality of pH electrode output signal, also be provided with wave filter between pH electrode and the analog to digital converter.
Formaldehyde in food content detecting method of the present utility model is: under the condition that has sodium sulphite to exist, add formalin, then the pH value of solution will rise, the trend that the pH value rises is directly proportional with the concentration of formaldehyde in the formalin, change according to the pH value in the solution, can find out the concentration of formaldehyde with the variation relation of pH value, finally can draw the concentration of formaldehyde in the ortho-formaldehyde solution according to the pH value of measuring at last, further can draw the content of formaldehyde in the initial soln.
This method comprises the steps: specifically
Step 101: many groups formaldehyde mass percentage content of getting certain volume is that 37 ~ 40% formalin solution is packed in the corresponding container, formalin solution in every group of container is diluted to 100 ~ 1000 times that are lower than national Specification formaldehyde in food content, and above-mentioned every group of formalin solution has different extension rates;
Step 102: configuration concentration is the sodium sulfite solution of 0.097 ~ 0.1g/L, simultaneously, and configuration pH meter buffer solution;
Step 103: use the pH meter buffer solution of preparing to carry out the calibration of pH meter;
Step 104: it is 8 ~ 11 strong basicity dilution formalin solution that the formalin solution after each dilution in the step 101 is configured to pH, measures the pH value of each strong basicity dilution formalin solution again with pH meter, and writes down pH value at this moment;
Step 105: in each strong basicity dilution formalin solution of step 104, add the sodium sulfite solution that disposes in the step 102, formaldehyde in the strong basicity dilution formalin solution of the addition assurance correspondence of sodium sulfite solution is by complete reaction, treat to measure with pH meter after formaldehyde is by complete reaction the pH value of every group of formalin solution correspondence this moment, the strong basicity that has added sodium sulphite to above-mentioned each group is diluted the formalin dilute solution that adds certain volume in the formalin solution several times again, the extension rate of every group of formalin solution of configuration is corresponding one by one (namely dilute formalin solution and joined by the formalin dilute solution that has diluted 100,000 times in the step 1, at first group of strong basicity that has added sodium sulphite, 100,000 times the formalin dilute solution that diluted the dilution that adds certain volume in the formalin solution several times by first group of strong basicity that has added sodium sulphite in the extension rate of the formalin dilute solution that adds in above-mentioned every group of strong basicity dilution formalin solution that has added sodium sulphite and the step 101; Second group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 12.5 ten thousand times in the step 1, in second group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 12.5 ten thousand times formalin dilute solution; The 3rd group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 200,000 times in the step 1, in the 3rd group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 200,000 times formalin dilute solution; The 4th group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 250,000 times in the step 1, in the 4th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 250,000 times formalin dilute solution; The 5th group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 500,000 times in the step 1, in the 5th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 500,000 times formalin dilute solution; The 6th group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 62.5 ten thousand times in the step 1, in the 6th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 62.5 ten thousand times formalin dilute solution; The 7th group of strong basicity dilution formalin solution that has added sodium sulphite joined by the formalin dilute solution that has diluted 1,000,000 times in the step 1, in the 7th group of strong basicity dilution formalin solution that has added sodium sulphite, add several times certain volume dilution 1,000,000 times formalin dilute solution), and after each the adding, measure the corresponding pH value in each time formalin dilute solution adding back by pH meter, and write down above-mentioned all pH values, when above-mentioned every group of strong basicity dilution formalin solution that has added sodium sulphite added the formalin dilution of corresponding extension rate several times, the volume of each formalin dilute solution that adds and the corresponding relation of pH value were seen Fig. 1 ~ 7;
Step 106: add the volume of formaldehyde in the formalin dilute solution and this time according to each time in the step 105 and add corresponding pH value behind the formalin dilute solution, determine the various volumes of formaldehyde and the linear relationship of corresponding pH value, thereby determine the various quality of formaldehyde and the linear relationship of corresponding pH value;
Step 201: detect in the food whether have formaldehyde, do not consider for the food that does not have formaldehyde to exist;
Step 202: carry out milled processed for the food that has formaldehyde, put into fixing container vessels adding distil water then and dissolve, obtain existing the aqueous solution of the food of formaldehyde;
Step 203: the aqueous solution of getting the food that has formaldehyde is in fixing vessel, add a certain amount of strong base solution then, make its pH value in 8 ~ 11 scopes, be the sodium sulfite solution of 0.097 ~ 0.1g/L again to the concentration that wherein adds certain volume, formaldehyde in the strong basicity dilution formalin solution of the addition assurance correspondence of sodium sulfite solution is by complete reaction, after treating complete reaction, measure the pH value of this solution, and the various quality of the formaldehyde determined in this pH value and the step 106 linear relationship with corresponding pH value compared, determine the corresponding formaldehyde quality of pH value of this solution.
Technique scheme is utilized following chemical equation HCHO+Na
2SO
3+ H
2O-→ HOCH
2-SO
3Na+NaOH detects the formaldehyde in the food, but because the sodium sulphite hydrolysis is alkalescence, in order to get rid of the interference of sodium sulphite hydrolysis, therefore the utility model is before using this reaction equation detection, at first carry out titration with NaOH, build the environment of an alkalescence, allow this be reflected at reaction under the alkali condition (because initial soln might be acid, when the utility model adds sodium sulphite, just may be by a reaction part, cause the formaldehyde can not be by complete reaction, and sodium sulphite exist hydrolysis in solution, its hydrolysis is alkalescent, the utility model is built alkaline environment also can suppress its hydrolysis simultaneously) because this reaction makes the pH value in the solution that variation take place, carry out test of many times, under the variable concentrations condition, test, find out a kind of volume of formaldehyde and the relation between the pH value.Therefore, with the pH value of solution as signal acquisition point, finish the collection to signal, carry out signal then and handle, finally utilize various effective algorithms to carry out data and handle, find out and a kind ofly be suitable for this and install simple algorithm, according to initial to relation further analyze, carry out final data and handle, draw in the initial soln content of formaldehyde more accurately, reach purpose fast and accurately.
In the step 101 of such scheme, described formalin solution has 7 groups, the volume of every group of formalin solution is 1ml, described 7 groups of formalin solutions are diluted 1,000,000,62.5 ten thousand, 500,000,250,000,200,000,12.5 ten thousand and 100,000 times respectively (because the content of formaldehyde is not higher than 2000ppm in the national standard, the content of formaldehyde that the laboratory will be considered also will be lower than national standard, and the multiple of formalin dilution is very big when therefore doing experiment).
In the technique scheme, pH meter buffer solution is pH6.86 solution, and this pH6.86 solution is by GR potassium dihydrogen phosphate 3.387g, GR sodium hydrogen phosphate 3.533g, is dissolved in the high purity deionized water of 1000mL to obtain.
In the technique scheme, in the step 104, it is 8 ~ 11 strong basicity dilution formalin solution that the sodium hydroxide solution that adds concentration in the formalin solution after each dilution and be 0.0096 ~ 0.01mol/L makes formalin solution become pH.Above-mentioned sodium hydroxide solution is prepared with solid sodium hydroxide, and the content of NaOH is not less than 96% in the solid sodium hydroxide.
In the technique scheme, in the step 105, in each strong basicity dilution formalin solution of step 104, add the sodium sulfite solution 10ml that disposes in the step 102; Dilute the formalin dilute solution that divides five each 1ml of adding in the formalin solution to the above-mentioned strong basicity that each has added sodium sulphite.Above-mentioned sodium sulfite solution is prepared with solid sodium sulfite, and the content of sodium sulphite is not less than 97% in the solid sodium sulfite.Because the sodium sulphite hydrolysis is alkalescence, in order to get rid of the interference of sodium sulphite hydrolysis, therefore we are before using this reaction equation detection, at first carry out titration with NaOH, build the environment of an alkalescence, allow this be reflected at reaction under the alkali condition (because initial soln might be acid, when we add sodium sulphite, just may be by a reaction part, cause the formaldehyde can not be by complete reaction, and sodium sulphite exists hydrolysis in solution, its hydrolysis is alkalescent, and we build alkaline environment also can suppress its hydrolysis simultaneously), sodium sulfite solution is excessive, and the amount of sodium sulphite fixes, and the amount experiment that therefore can only change formaldehyde goes out the volume of formaldehyde and the relation of pH value.
In the technique scheme, in the step 106, the various quality of formaldehyde are y=1*10 with the linear relationship of corresponding pH value
9x
5+ 9*10
7x
4-2*10
6x
3-40348x
2+ 529x+9.73, wherein, x represents the quality of formaldehyde, y represents corresponding pH value.In experiment, what write down all is volume and the concentration of formaldehyde, so can find out volume and (the similar relation as shown in Figure 1 of the relation between the pH value of the formaldehyde of each concentration earlier, this relation is the relation that volume is corresponding with the pH value just), the concentration range of formaldehyde is determined owing to add, therefore volume can be converted to the quality of formaldehyde, finally can draw the quality of formaldehyde and the corresponding relation between the pH value, draw the counter quality of releasing formaldehyde in the ortho-formaldehyde solution of the pH value of in the end measuring according to this relation then, judge according to national standard whether this food meets the nation's security standard again.
In the technique scheme, national Specification formaldehyde in food content is not for being higher than 2000ppm.
In the technique scheme, also need to dispose the saturated Klorvess Liquid of 3mol/L, soak the pH electrode.
In the technique scheme, pH meter fully to specifications step and supporting damping fluid calibrate, mainly to control the temperature of damping fluid exactly well, this temperature is the temperature under the experiment condition.The temperature range of experiment is 23 ℃ ~ 26 ℃.
Fig. 1 has represented the relation between formaldehyde volume and the pH value, and horizontal ordinate is represented the volume of formaldehyde (concentration known) among Fig. 1, and ordinate is represented the pH value that records, and the volume of formaldehyde and pH value are inversely proportional to.The laboratory that records according to each group draws the linear relationship value of each group with the method for similar Fig. 1 then, again according to these concern to push away the quality of formaldehyde and the relation between the pH value, relation as shown in Figure 2, by the concentration relationship computational analysis to the front, the concentration of formaldehyde that this relation is fit to is less than 0.0022mg/ml, when concentration is higher, will produce than mistake, therefore, during formaldehyde in detecting food, with the bigger multiple of formalin solution dilution ratio in the step 101.
The content that this instructions is not described in detail belongs to this area professional and technical personnel's known prior art.
Claims (2)
1. the pick-up unit of a formaldehyde in food content, it is characterized in that: it comprises pH electrode, analog to digital converter, processor, storer and display, wherein, the signal output part of described pH electrode connects the signal input part of processor by analog to digital converter, the demonstration signal output part of processor connects display, the data communication end connected storage of processor.
2. the pick-up unit of formaldehyde in food content according to claim 1 is characterized in that: also be provided with wave filter between described pH electrode and the analog to digital converter.
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| CN 201320016957 CN203117142U (en) | 2013-01-11 | 2013-01-11 | Device for detecting content of formaldehyde in food |
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| CN 201320016957 CN203117142U (en) | 2013-01-11 | 2013-01-11 | Device for detecting content of formaldehyde in food |
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| CN203117142U true CN203117142U (en) | 2013-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091371A (en) * | 2013-01-11 | 2013-05-08 | 江汉大学 | Detection method and detection device for content of formaldehyde in foods |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091371A (en) * | 2013-01-11 | 2013-05-08 | 江汉大学 | Detection method and detection device for content of formaldehyde in foods |
| CN103091371B (en) * | 2013-01-11 | 2015-12-02 | 江汉大学 | The detection method of formaldehyde in food content |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20150111 |
|
| EXPY | Termination of patent right or utility model |