CN102121905A - Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof - Google Patents
Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof Download PDFInfo
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- CN102121905A CN102121905A CN2010105904860A CN201010590486A CN102121905A CN 102121905 A CN102121905 A CN 102121905A CN 2010105904860 A CN2010105904860 A CN 2010105904860A CN 201010590486 A CN201010590486 A CN 201010590486A CN 102121905 A CN102121905 A CN 102121905A
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Abstract
The invention provides a test strip for detecting heavy metal-chromium (Cr) in water quality and a preparation method thereof, and belongs to the technical field of water quality detection. The test strip sequentially comprises an insulating waterproof substrate, a reaction substrate membrane, a filter layer and a cover plate which are bonded together from the bottom up, wherein, two distance sleeves are respectively arranged at the sides of the test strip. The operating method comprises the following steps: immobilizing a color-developing agent (diphenylcarbazide) into the test strip; placing the obtained test strip in a photoelectric sensor, and then dropping a Cr-containing sample solution into the test strip for full color development reaction; and utilizing the sensor to irradiate the test strip by virtue of monochromatic light, then collecting green reflected light and finally converting the green reflected light into an electrical signal. The reflectivity of the developed test strip and corresponding Cr concentration show good linear relation after color development, the detection limit is less than 5mol/L, and the test time is less than 3 minutes. Repetitive experimental data proves that the method has the advantages of good repeatability and short detection time; and by utilizing the method, on-site rapid reagent-instrument integrated detection of Cr ions can be realized.
Description
Technical field
What the present invention relates to is test paper of a kind of water quality monitoring technical field and preparation method thereof, specifically is a kind of test strips of detecting the water quality heavy metal chromium and preparation method thereof that is used for.
Background technology
Chromium and compound thereof are widely used in industry such as metallurgy, process hides, plating.The chromium that chrome-plated process has only is plated on the plating piece, thereby chromium discharges with factory effluent.Therefore, chromium is on the rise to the pollution of environment, can cause serious toxic action to human body and contact chromium for a long time.The authenticity method of current detection pollution of chromium is an atomic absorption spectrophotometry, and this kind method has advantages such as accurate, accurate, but sample pre-treatments complexity, detection time long, need large-scale instrument and can not realize on-the-spot the detection.And can remedy many deficiencies with sensor, in the hope of the scene of realizing chromium in the water quality, reach the integrated detection of reagent instrument fast.
Find through retrieval existing pertinent literature and patent, Chinese patent application numbers 200810212295, name is called " detection method of chromium in a kind of milk and milk products ".This technology is to use graphite furnace atomic absorption spectrometry that heavy metal chromium is detected, and this method sample pretreatment process is complicated and need the professional to operate, and the scene that is unsuitable for chromium is detected.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of test strips of detecting the water quality heavy metal chromium and preparation method thereof that is used for is provided, test strips is made in the immobilization of developer diphenylcarbazide, put into and splash into the sample solution that contains chromium behind the photoelectric sensor and carry out sufficient chromogenic reaction, sensor shines test strips by monochromatic light, and gather green reflected light, be translated into electric signal at last.After the strip colour developing of the present invention's development, its reflectivity presents good linear relationship with corresponding chromium concn, and detectability is lower than 5mol/L, and the test duration is lower than 3 minutes.Favorable reproducibility of repeated experiment digital proof the method and detection time are short, can realize chromium ion scene, quick, the integrated detection of reagent instrument.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of test strips that is used for detecting the water quality heavy metal chromium, from down and on comprise bonding insulative water-proof substrate, reaction substrate diaphragm, filtering layer and cover plate mutually successively, the side of described test strips is respectively equipped with two spacers.
Be equipped with mating holes on described cover plate and the insulative water-proof substrate, be used for installing alignment.
Described cover plate and insulative water-proof substrate are all made by the PVC material, and width is 2cm, and length is identical.
Described reaction substrate diaphragm is by transparent substrate film slide glass and adhere to and reaction substrate rete on it is formed.
Described filtering layer be by do not absorb water or absorption affinity a little less than glass fibre make its thickness 0.5mm.
The thickness of described reaction substrate rete is 200～240nm, and its component is developer and screening agent water.
The present invention relates to the preparation method of above-mentioned test strips, may further comprise the steps:
The first step: take by weighing cetrimonium bronmide 0.074～0.296g, 2% polyvinyl alcohol (PVA) 1～3mL, citric acid 2.08g are dissolved in the 10mL distilled water ie in solution A;
Second step: accurately take by weighing developer diphenylcarbazide 0.484～1.936g, be dissolved in 20mL acetone, ie in solution B;
The concentration of described diphenylcarbazide is 0.5～2mg/mL.
The 3rd step: with pouring mortar into after solution A and the solution B mixing, add water soluble chitosan 2～4g then, silica gel 4～6g fully grinds, and obtains thick film forming agent;
The 4th step: with film forming agent coating film forming on substrate film carrying tablet of making, drying is made the reaction substrate diaphragm with spreader;
Described drying is meant: dry in 30 ℃ baking oven.
The 5th step, after the insulative water-proof substrate center is got pilot hole, respectively reaction substrate diaphragm, filtering layer, cover plate are overlapped successively and stick on this insulative water-proof substrate, and, make the test strips that is used for testing the water quality heavy metal chromium with cover plate and insulative water-proof substrate adhesion overall fixed.
Method of operating of the present invention is: the test strips of making is inserted in the jack of photoelectric sensor, carrying out blank background light by definite key detects, wait on the screen and occurring: splash into the testing sample that splashes into 20 μ L behind the printed words that testing sample detects and detect, undertaken next step by definite key behind the 120s, the photoelectricity intensity level that occurs on the record screen of back.
Of the present invention have advantage to be: instrument is easy to carry, the sample preparation time short, detection time is short and adopt machinery to be coated with membrane technology, film with the method system goes out the thickness homogeneous, detection reaction speed is fast, the production of whole strip is further simplified, enhanced productivity, reduce production costs, and shorten the sample preparation time greatly, detectability is lower than 5mol/L, and testing result accuracy rate, the recovery are higher than 95%, can reach the requirement of the field quick detection of sample.
Description of drawings
Fig. 1 detects synoptic diagram for the use of fast detecting chromium strip of the present invention.
Fig. 2 is the structural representation of fast detecting chromium strip of the present invention.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Fig. 1 detects principle schematic for the use of fast detecting chromium strip of the present invention, light is reflected project the test section of test strips from light emitting diode after, reflected light is received and is converted to electric signal by silicon diode and transmits, finally be presented on the display, and the shade of the intensity of electric signal and test strips test section is proportional.Test strips in the present embodiment comprises insulative water-proof substrate 1, reaction substrate diaphragm 2, filtering layer 3, spacer 4 and cover plate 5, as shown in Figure 2.The punching of mechanical stamping punch method is adopted in insulative water-proof substrate 1 and cover plate 5 superimposed backs, aperture 0.3mm, hole wall is apart from substrate edge 2mm, the requirement hole wall is smooth, no burr, the adsorption effect of hole wall in the time of reducing application of sample like this, sample is evenly distributed at well, punch position will match with the checkout equipment interface, and circular hole is a well on the cover plate 5, and circular hole is an instrument connection on the substrate 1.The insulative water-proof substrate adopts the PVC material.
This experiment embodiment obtains in the following manner:
(1) acquisition of testing sample: the resident who takes from the urban district, Shanghai uses tap water.
(2) making of reaction substrate diaphragm: comprise reaction substrate rete and substrate film slide glass, substrate film slide glass requires to have good light transmission and reflection function, and polyvinyl chloride (PVC) sheets is adopted in suggestion, and optimum thickness is 80nm.The reaction substrate rete is the coating of developer.Its basic method for making be take by weighing cetrimonium bronmide 0.074g, 2% polyvinyl alcohol (PVA) 1mL, citric acid 2.08g are dissolved in the 10mL distilled water, ie in solution A accurately takes by weighing developer diphenylcarbazide 0.484g again, is dissolved in 20mL acetone, ie in solution B.After pour mortar into after two parts of solution of A, B are mixed, add water soluble chitosan 2g then, silica gel 4g fully grinds, and obtains thick film forming agent.At last with spreader with film forming agent coating film forming on substrate film carrying tablet of making, after to put into 30 ℃ of baking ovens dry, make the reaction substrate diaphragm.
(3) assembling of test strip: have openning hole the insulative water-proof substrate is corresponding with cover plate, the aperture be 0.3mm, after successively the alignment of reaction substrate diaphragm, filtering layer is positioned over the insulative water-proof substrate, the edge rises with the spacer pad, make test strips thickness even, build cover plate at last, promptly make test strips with the insulative water-proof substrate with corresponding the gluing of double faced adhesive tape, again with cutting machine with the test strips well cutting after, be loaded on seal up for safekeeping in the aluminium foil bag to treat standby.Cover plate and insulative water-proof substrate are accomplished fluently circular hole before installation, and will align after installing.
(4) test strips detects the operating process of chromium in the water quality: the test strips of making is inserted in the jack of photoelectric sensor, carrying out blank background light by definite key detects, wait on the screen and occurring: splash into the testing sample that splashes into 20 μ L behind the printed words that testing sample detects and detect, undertaken next step by definite key behind the 60s, the photoelectricity intensity level that occurs on the record screen of back.
(5) result judges: the typical curve with photoelectric type sensor chromium is Y=0.369-0.10 log C, correlation coefficient r=-0.997 (p＜0.001), be 3 minutes detection time, detection limit 1.9mol/L, through further optimizing, this method is expected to realize scene, the fast detecting to chromium in the drinking-water.
(6) repeated experiment: with the standard specimen of 50 concentration known of photoelectric type sensor, obtaining the recovery is 96%, chooses 25 standard specimens that contain chromium again respectively, tests with 25 standard specimens that do not contain chromium, and obtaining accuracy rate is 97%.This shows that the accuracy and the accuracy of the method still can.
(1) acquisition of testing sample: with embodiment 1.
(2) making of reaction substrate diaphragm: comprise reaction substrate rete and substrate film slide glass, substrate film slide glass requires to have good light transmission and reflection function, and polyvinyl chloride (PVC) sheets is adopted in suggestion, and optimum thickness is 80nm.The reaction substrate rete is the coating of developer.Its basic method for making be take by weighing cetrimonium bronmide 0.148g, 2% polyvinyl alcohol (PVA) 2mL, citric acid 2.08g are dissolved in the 10mL distilled water, ie in solution A accurately takes by weighing developer diphenylcarbazide 0.968g again, is dissolved in 20mL acetone, ie in solution B.After pour mortar into after two parts of solution of A, B are mixed, add water soluble chitosan 3g then, silica gel 5g fully grinds, and obtains thick film forming agent.At last with spreader with film forming agent coating film forming on substrate film carrying tablet of making, after to put into 30 ℃ of baking ovens dry, make the reaction substrate diaphragm.
(3) assembling of test strip: implementation process is with example 1.
(4) test strips detects the operating process of chromium in the water quality: with example 1.
(5) result judges: the typical curve with photoelectric type sensor chromium is Y=0.65681-0.22427 log C, correlation coefficient r=-0.991 (p＜0.001), be 3 minutes detection time, detection limit 1.9mol/L, through further optimizing, this method is expected to realize scene, the fast detecting to chromium in the drinking-water.
(6) repeated experiment: with the standard specimen of 50 concentration known of photoelectric type sensor, obtaining the recovery is 99%, chooses 25 standard specimens that contain chromium again respectively, tests with 25 standard specimens that do not contain chromium, and obtaining accuracy rate is 98%.This shows that the accuracy and the accuracy of the method are good.
(1) acquisition of testing sample: with embodiment 1.
(2) making of reaction substrate diaphragm: comprise reaction substrate rete and substrate film slide glass, substrate film slide glass requires to have good light transmission and reflection function, and polyvinyl chloride (PVC) sheets is adopted in suggestion, and optimum thickness is 80nm.The reaction substrate rete is the coating of developer.Its basic method for making be take by weighing cetrimonium bronmide 0.296g, 2% polyvinyl alcohol (PVA) 3mL, citric acid 2.08g are dissolved in the 10mL distilled water, ie in solution A accurately takes by weighing developer diphenylcarbazide 1.936g again, is dissolved in 20mL acetone, ie in solution B.After pour mortar into after two parts of solution of A, B are mixed, add water soluble chitosan 4g then, silica gel 6g fully grinds, and obtains thick film forming agent.At last with spreader with film forming agent coating film forming on substrate film carrying tablet of making, after to put into 30 ℃ of baking ovens dry, make the reaction substrate diaphragm.
(3) assembling of test strip: implementation process is with example 1.
(4) test strips detects the operating process of chromium in the water quality: with example 1.
(5) result judges: the typical curve with photoelectric type sensor chromium is Y=0.95-057 log C, correlation coefficient r=-0.995 (p＜0.001), be 4 minutes detection time, detection limit 1.9mol/L, through further optimizing, this method is expected to realize scene, the fast detecting to chromium in the drinking-water.
(6) repeated experiment: with the standard specimen of 50 concentration known of photoelectric type sensor, obtaining the recovery is 99%, chooses 25 standard specimens that contain chromium again respectively, tests with 25 standard specimens that do not contain chromium, and obtaining accuracy rate is 99.6%.This shows that the accuracy and the accuracy of the method are good.
Claims (9)
1. a test strips that is used for detecting the water quality heavy metal chromium is characterized in that, from down and on comprise bonding insulative water-proof substrate, reaction substrate diaphragm, filtering layer and cover plate mutually successively, the side of described test strips is respectively equipped with two spacers.
2. the test strips that is used for detecting the water quality heavy metal chromium according to claim 1 is characterized in that, is equipped with mating holes on described cover plate and the insulative water-proof substrate.
3. the test strips that is used for detecting the water quality heavy metal chromium according to claim 1 is characterized in that, described cover plate and insulative water-proof substrate are all made by the PVC material, and width is 2cm, and length is identical.
4. the test strips that is used for detecting the water quality heavy metal chromium according to claim 1 is characterized in that, described reaction substrate diaphragm is by transparent substrate film slide glass and adhere to and reaction substrate rete on it is formed.
5. the test strips that is used for detecting the water quality heavy metal chromium according to claim 1 is characterized in that described filtering layer is made by glass fibre, its thickness 0.5mm.
6. the test strips that is used for detecting the water quality heavy metal chromium according to claim 1 is characterized in that, the thickness of described reaction substrate rete is 200～240nm, and its component is developer and screening agent water.
7. the preparation method according to the described test strips of above-mentioned arbitrary claim is characterized in that, may further comprise the steps:
The first step: take by weighing cetrimonium bronmide 0.074～0.296g, 2% polyvinyl alcohol (PVA) 1～3mL, citric acid 2.08g are dissolved in the 10mL distilled water ie in solution A;
Second step: accurately take by weighing developer diphenylcarbazide 0.484～1.936g, be dissolved in 20mL acetone, ie in solution B;
The 3rd step: with pouring mortar into after solution A and the solution B mixing, add water soluble chitosan 2～4g then, silica gel 4～6g fully grinds, and obtains thick film forming agent;
The 4th step: with film forming agent coating film forming on substrate film carrying tablet of making, drying is made the reaction substrate diaphragm with spreader:
The 5th step, after the insulative water-proof substrate center is got pilot hole, respectively reaction substrate diaphragm, filtering layer, cover plate are overlapped successively and stick on this insulative water-proof substrate, and, make the test strips that is used for testing the water quality heavy metal chromium with cover plate and insulative water-proof substrate adhesion overall fixed.
8. according to the preparation method of the described test strips of claim 7, it is characterized in that the concentration of described diphenylcarbazide is 0.5～2mg/mL.
9. according to the preparation method of the described test strips of claim 7, it is characterized in that described drying is meant: dry in 30 ℃ baking oven.
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| CN2010105904860A CN102121905A (en) | 2010-12-16 | 2010-12-16 | Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2498294C1 (en) * | 2012-10-22 | 2013-11-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский государственный университет" | Method of determining chromium (vi) |
| CN103412125A (en) * | 2013-08-25 | 2013-11-27 | 河南科技学院 | Gold-labeled test strip for rapid detection of chromium ions as well as preparation method and application thereof |
| CN103776826A (en) * | 2014-01-16 | 2014-05-07 | 无限极（中国）有限公司 | Masking-agent-containing test strip for detecting content of cadmium in Chinese herbal medicine |
| CN104034725A (en) * | 2014-06-25 | 2014-09-10 | 湖北工业大学 | Rapid detection test paper for trace chromium and preparation method of rapid detection test paper |
| CN104148009A (en) * | 2014-06-17 | 2014-11-19 | 厦门出入境检验检疫局检验检疫技术中心 | Composite bentonite material capable of quickly identifying hexavalent chromium ions in water with naked eyes as well as preparation method and application of material |
| CN104792781A (en) * | 2015-04-30 | 2015-07-22 | 张舒捷 | Detection test strip for Barium ion in drinking water and water source and detection method thereof |
| CN104792777A (en) * | 2015-01-16 | 2015-07-22 | 深圳市环境科学研究院 | An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water and a determination method |
| CN105008902A (en) * | 2013-03-08 | 2015-10-28 | 艺康美国股份有限公司 | Methods and systems for analyzing a liquid medium |
| CN107271379A (en) * | 2017-05-11 | 2017-10-20 | 防城港市质量技术监督局 | A kind of water quality quick determination method |
| CN108693330A (en) * | 2018-05-08 | 2018-10-23 | 河南省林业科学研究院 | Using the time as coordinate half-quantitative detection soil in chromium content device and preparation method thereof |
| CN109580600A (en) * | 2018-11-23 | 2019-04-05 | 中国科学院苏州生物医学工程技术研究所 | Seminal plasma biochemistry zinc ion quick detection reagent item and detection method |
| CN110907441A (en) * | 2019-12-04 | 2020-03-24 | 南京大学 | Real-time visual sensing detection system and method for Cr (VI) ions in water |
| CN111693523A (en) * | 2020-06-22 | 2020-09-22 | 阳新娲石水泥有限公司 | Method for detecting total chromium content in raw materials of cement clinker |
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| RU2498294C1 (en) * | 2012-10-22 | 2013-11-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский государственный университет" | Method of determining chromium (vi) |
| CN105008902A (en) * | 2013-03-08 | 2015-10-28 | 艺康美国股份有限公司 | Methods and systems for analyzing a liquid medium |
| CN103412125A (en) * | 2013-08-25 | 2013-11-27 | 河南科技学院 | Gold-labeled test strip for rapid detection of chromium ions as well as preparation method and application thereof |
| CN103412125B (en) * | 2013-08-25 | 2015-09-23 | 河南科技学院 | Chromium ion detects gold test strip and preparation method thereof and application fast |
| CN103776826B (en) * | 2014-01-16 | 2016-05-25 | 无限极（中国）有限公司 | With the test strips of the detection Chinese herbal medicine cadmium content of screening agent and in the purposes detecting in Chinese herbal medicine cadmium content |
| CN103776826A (en) * | 2014-01-16 | 2014-05-07 | 无限极（中国）有限公司 | Masking-agent-containing test strip for detecting content of cadmium in Chinese herbal medicine |
| CN104148009A (en) * | 2014-06-17 | 2014-11-19 | 厦门出入境检验检疫局检验检疫技术中心 | Composite bentonite material capable of quickly identifying hexavalent chromium ions in water with naked eyes as well as preparation method and application of material |
| CN104148009B (en) * | 2014-06-17 | 2017-01-18 | 厦门出入境检验检疫局检验检疫技术中心 | Composite bentonite material capable of quickly identifying hexavalent chromium ions in water with naked eyes as well as preparation method and application of material |
| CN104034725A (en) * | 2014-06-25 | 2014-09-10 | 湖北工业大学 | Rapid detection test paper for trace chromium and preparation method of rapid detection test paper |
| CN104792777A (en) * | 2015-01-16 | 2015-07-22 | 深圳市环境科学研究院 | An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water and a determination method |
| CN104792781A (en) * | 2015-04-30 | 2015-07-22 | 张舒捷 | Detection test strip for Barium ion in drinking water and water source and detection method thereof |
| CN104792781B (en) * | 2015-04-30 | 2015-11-18 | 张舒捷 | Barium ion test strip and detection method in a kind of potable water and water source |
| CN107271379A (en) * | 2017-05-11 | 2017-10-20 | 防城港市质量技术监督局 | A kind of water quality quick determination method |
| CN108693330A (en) * | 2018-05-08 | 2018-10-23 | 河南省林业科学研究院 | Using the time as coordinate half-quantitative detection soil in chromium content device and preparation method thereof |
| CN108693330B (en) * | 2018-05-08 | 2019-09-06 | 河南省林业科学研究院 | Using the time as the device and preparation method thereof of chromium content in coordinate half-quantitative detection soil |
| CN109580600A (en) * | 2018-11-23 | 2019-04-05 | 中国科学院苏州生物医学工程技术研究所 | Seminal plasma biochemistry zinc ion quick detection reagent item and detection method |
| CN109580600B (en) * | 2018-11-23 | 2021-08-24 | 中国科学院苏州生物医学工程技术研究所 | Reagent strip for biochemical rapid detection of zinc ions in seminal plasma and detection method |
| CN110907441A (en) * | 2019-12-04 | 2020-03-24 | 南京大学 | Real-time visual sensing detection system and method for Cr (VI) ions in water |
| CN111693523A (en) * | 2020-06-22 | 2020-09-22 | 阳新娲石水泥有限公司 | Method for detecting total chromium content in raw materials of cement clinker |
| CN111693523B (en) * | 2020-06-22 | 2022-04-19 | 阳新娲石水泥有限公司 | Method for detecting total chromium content in raw materials of cement clinker |
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Application publication date: 20110713 |