CN1265189C - Test paper for detecting water hardness and detecting method - Google Patents
Test paper for detecting water hardness and detecting method Download PDFInfo
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- CN1265189C CN1265189C CN 200410050283 CN200410050283A CN1265189C CN 1265189 C CN1265189 C CN 1265189C CN 200410050283 CN200410050283 CN 200410050283 CN 200410050283 A CN200410050283 A CN 200410050283A CN 1265189 C CN1265189 C CN 1265189C
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- determining total
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Abstract
The present invention relates to test paper and a detecting method for quantitatively detecting the total hardness of water quality, which is characterized in that a test paper strip is immersed in a mixed solution, wherein the mixed solution is prepared from 0.2 to 1 mg/L of eriochrome black T, 0.01 to 0.05 m mol/L of EDTA magnesium salt, 4 to 40mL/100 ml of mixed sodium tetraborate-sodium hydroxide buffer solution with the pH valve of 7 to 11, 0.5 to 2 g/L of aminium salt and 1 to 4 mg/L of DDTC. the test paper is immersed in the mixed solution for 5 minutes to 10 minutes, is aired, and is plastically packed and is provided with a film by press by a film pressing machine. The detecting method comprises: one end of the test paper is cut to be perpendicularly inserted into a water sample for 5 minutes to 10 minutes, and a red complex compound is generate by Ca<2+> and Mg<2+> which are contained in water and the test paper strip. The total hardness value of water quality can be quantitatively detected by measuring the height of the red complex compound. The present invention has the advantages of accurate detection, convenient operation, strong pollution resistance, convenient storage for a long time, etc. The present invention can rapidly detect the total hardness of water quality on site. The test paper is suitable for detecting the total hardness of various kinds potable water, boiler water, industrial circulating cooling water, surface water and underground water.
Description
Technical field
The invention belongs to water quality inspection technique, particularly a kind of test paper of detection by quantitative determining total hardness of water and detection method.
Background technology
At present, the aspects such as commercial production, environmental monitoring and domestic water that are determined at of determining total hardness of water all are absolutely necessary, and more and more are much accounted of.The general total hardness that adopts methods such as chemical analysis and instrumental analysis to detect water quality, these methods need the analytical control technician of specialty, in the laboratory, have under the conditions such as certain device instrument, vessel and chemical reagent and carry out, and the mensuration process is loaded down with trivial details, time-consuming.The total hardness that adopts test paper method to measure water quality is also arranged, solve the problem of above-mentioned existence.For example the Chinese patent of application number 99111693,3 has been announced " a kind of test paper for determining total hardness of water ", announced " a kind of test paper for detecting total hardness of water and preparation method " with the Chinese patent of application number 01132383,3, but all there is the in use easy contaminated problem of test paper, the part that for example is soaked with water sample can not touch, more can not with other not the test paper plate of usefulness mix and to put, very tight to user's requirement like this, be easy to bring various operate misss; Also exist owing to from a packing, take out wherein a slice test paper, though other test paper usefulness not then, because of contact easily deterioration failure in various degree with air; In addition, because detection is the depth according to the coloring matter color of water sample and test paper reaction generation, perhaps the test paper color is judged determining total hardness of water by blue, blue purple, purplish red variation, this will be owing to the difference of people's naked eyes to the color discrimination ability, and cause the determining total hardness of water test errors greatlyyer, can not satisfy the technical requirement of quantitative measurement.
Summary of the invention
The objective of the invention is to solve the technical matters that adopts existing test paper test determining total hardness of water to exist, provide that a kind of test is accurate, easy to operate, resistance tocrocking is strong, can on-the-spot test paper and detection method of testing determining total hardness of water fast.
Technical essential of the present invention is: Ca in the test paper of detection determining total hardness of water and the water quality
2+, Mg
2+Generate red fluor-complex, this red material becomes quantitative relationship along the height that test paper rises with determining total hardness of water, because the colour developing of test paper is monochromatic, and be not subjected to the influence of shade, can accurately, fast, conveniently detect the determining total hardness of water value with the height of surveyors' staff quantitative measurement coloring matter; In the test paper mixed liquor, adopted the EDTA disodium magnesium, made the sensitivity of detection not be subjected to Ca in the water sample to be measured
2+, Mg
2+The influence of concentration ratio, therefore the total hardness value that detects is accurate; Because each sheet test paper all has the plastic packaging film,, be easy to long preservation and use so resistance tocrocking is strong; Test paper color development is monochromatic, just can accurately judge determining total hardness of water according to the length of color, has overcome existing test paper and has judged the big problem of determining total hardness of water error according to change color.
The test paper of detection by quantitative determining total hardness of water of the present invention impregnated in test strips in the mixed liquor earlier, and mixed liquor consists of: eriochrome black T 0.2～1mg/L; EDTA magnesium salts 0.01～0.05mmol/L; Ammonium salt 0.5～2g/L; PH7～11 sodium tetraborates-sodium hydroxide buffer solution 4～40mL/100ml, the optimum content of described eriochrome black T is 0.5～0.8mg/L, described pH7～11 sodium tetraborates-sodium hydroxide buffer solution optimum content is 8～32mL/100ml, sodium diethyldithiocarbamate DDTC 1～4mg/L, test strips is immersed in behind 5～10min in the above-mentioned mixed liquor of deionized water dilution, dry or in 50 ℃～80 ℃ dryings through room temperature, carry out the plastic packaging press mold with the press mold machine then, plastic packaging press mold temperature is 110 ℃～130 ℃, and described test strips is long 35～50mm, the chromatography filter paper bar of wide 3～6mm.
The method of detection by quantitative determining total hardness of water of the present invention is: test paper one end of plastic packaging cut off, vertically inserted in the water sample to be detected, and through 5～10min, Ca in the water then
2+, Mg
2+Generate red complex along test paper rising certain altitude and with test paper, this red complex has quantitative relationship along the height and the water hardness that test paper rises, and measures the height that develops the color with the determining total hardness of water surveyors' staff then and comes quantitative measurement determining total hardness of water value.
The test paper of detection by quantitative determining total hardness of water of the present invention and detection method can be measured water hardness exactly, to the water hardness (in calcium) of 10mg/L, are 4.93% through 11 its relative standard deviations of replicate determination (RSD).Detecting of this test paper is limited to 0.7mg/L (in calcium).Can accurately measure the above water hardness of 1mg/L (in calcium; If in lime carbonate, then measure on duty 2.5).
The present invention have detect accurate, easy to operate, resistance tocrocking is strong, can on-the-spotly test advantages such as determining total hardness of water fast, test paper color development is monochromatic, length according to colour developing just can accurately be judged determining total hardness of water, overcome existing test paper according to the depth of color or according to color by blue, orchid purple, purplish red water, industrial recirculated cooling water, the day water and phreatic hardness.Assay method is simple, directly perceived, and the test paper preparation cost is low, is easy to long-time preservation, is easy to carry, and can carry out on-site measurement.
Embodiment
Further specify technical scheme of the present invention and detection method below in conjunction with example.
1, the preparation of test paper
Earlier chromatography filter paper is cut into the test strips of long 50mm, wide 6mm, test strips be impregnated in the mixed liquor, mixed liquor consists of: network is deceived T 0.3mg/L; EDTA magnesium salts 0.035mmol/L; Ammonium salt 1.5g/L, pH10 sodium tetraborate-sodium hydroxide buffer solution 10ml, sodium diethyldithiocarbamate DDTC 2mg/L is diluted to 100ml with deionized water; Test paper is immersed in taking-up after 5～10 seconds in the mixed liquor; Dry or in 70 ℃ of dryings through room temperature again; Carry out the plastic packaging press mold with the press mold machine then, plastic packaging press mold temperature is 110 ℃.
2, the method for detection by quantitative determining total hardness of water
Test paper one end of plastic packaging is cut off, vertically inserted in the water sample to be detected, through 5min, then Ca in the water
2+, Mg
2+Generate red complex along the test paper rising and with test paper, measure the height of red material then with the determining total hardness of water surveyors' staff, can quantitative measurement determining total hardness of water value.If hardness exceeds 100mg/L (in calcium), for accurate mensuration can be measured water sample after the deionized water dilution again.
3. test paper method and EDTA titrimetry compare, and be as shown in table 1:
Table 1
| In calcium | In lime carbonate | Relative error (%) | |||
| Test paper method | The EDTA titrimetry | Test paper method | The EDTA titrimetry | ||
| Running water Nan Canal water north, the big eastern running water emperor's aunt running water peace running water iron west of Dongling running water Canal-water mineral water | 45 100 70 40 50 34 30 5 | 45.7 100.8 68.6 39.2 51.5 33.2 29.1 5.02 | 112.5 250 175 100 125 85 75 12.5 | 114.2 252 171.5 98 128.8 83 72.8 12.6 | -1.5 -0.8 2.0 2.0 -2.9 2.4 3.1 0.4 |
Annotate: 1. in the data of lime carbonate for to take advantage of 2.5 to obtain in the data of calcium.
2. water sample picks up from the resident of Shenyang City respectively and uses tap water and canal, north and south, city water.
Claims (4)
1. the test paper of a detection by quantitative determining total hardness of water is characterized in that, earlier test strips be impregnated in the mixed liquor, and mixed liquor consists of: eriochrome black T 0.2～1mg/L; EDTA magnesium salts 0.01～0.05mmol/L; PH7～11 sodium tetraborates-sodium hydroxide buffer solution 4～40mL/100ml; Ammonium salt 0.5～2g/L; Sodium diethyldithiocarbamate DDTC 1～4mg/L; Test strips is immersed in behind 5～10min in the above-mentioned mixed liquor of deionized water dilution, dries or in 50 ℃～80 ℃ dryings, dried test strips is carried out the plastic packaging press mold with the press mold machine through room temperature, plastic packaging press mold temperature is 110 ℃～130 ℃.
2, the test paper of detection by quantitative determining total hardness of water according to claim 1 is characterized in that described pH7～11 sodium tetraborates-sodium hydroxide buffer solution optimum content is 8～32mL/100ml.
3, the test paper of detection by quantitative determining total hardness of water according to claim 1, the optimum content that it is characterized in that described eriochrome black T is 0.5～0.8mg/L.
4, the test paper of detection by quantitative determining total hardness of water according to claim 1 is characterized in that the chromatography filter paper bar of described test strips for long 35～50mm, wide 3～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410050283 CN1265189C (en) | 2004-08-20 | 2004-08-20 | Test paper for detecting water hardness and detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410050283 CN1265189C (en) | 2004-08-20 | 2004-08-20 | Test paper for detecting water hardness and detecting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588008A CN1588008A (en) | 2005-03-02 |
| CN1265189C true CN1265189C (en) | 2006-07-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410050283 Expired - Fee Related CN1265189C (en) | 2004-08-20 | 2004-08-20 | Test paper for detecting water hardness and detecting method |
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| Country | Link |
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| CN (1) | CN1265189C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253165B (en) * | 2011-04-18 | 2014-04-16 | 宁夏大学 | Preparation method of total water hardness test indicator |
| CN102539329A (en) * | 2011-11-24 | 2012-07-04 | 沈阳理工大学 | Method for measuring total hardness of industrial water |
| CN104458820B (en) * | 2014-12-06 | 2017-01-11 | 安徽金培因科技有限公司 | Water damage test device for asphalt concrete pavements and use method thereof |
| CN106290826A (en) * | 2015-05-22 | 2017-01-04 | 熊光滨 | Colour band height quantitative method |
| CN105067611A (en) * | 2015-08-20 | 2015-11-18 | 北京福德安科技有限公司 | Quick test paper for hardness of water |
| CN106404767A (en) * | 2016-08-30 | 2017-02-15 | 孙逊 | Cotton swab for fast determining whether total hardness of water reaches standard |
| CN110726718A (en) * | 2019-11-05 | 2020-01-24 | 长春万成生物电子工程有限公司 | Test paper for detecting water hardness, preparation method and detection method thereof |
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2004
- 2004-08-20 CN CN 200410050283 patent/CN1265189C/en not_active Expired - Fee Related
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| CN1588008A (en) | 2005-03-02 |
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