CN1247311A - Test paper for determining total hardness of water - Google Patents
Test paper for determining total hardness of water Download PDFInfo
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- CN1247311A CN1247311A CN 99111693 CN99111693A CN1247311A CN 1247311 A CN1247311 A CN 1247311A CN 99111693 CN99111693 CN 99111693 CN 99111693 A CN99111693 A CN 99111693A CN 1247311 A CN1247311 A CN 1247311A
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- paper
- water
- test paper
- total hardness
- determining total
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Abstract
A test paper for determinint the total hardness of water is suitable for the water supply system of boiler and printing-dyeing trade, underground water and drinking water, and is composed of plate substrate and test paper pieces stuck on the plate substrate. Said test paper pieces have been immersed in the liquid mixture of azo dye (1-5 g/L), sodium tetraborate (10-20 g/L) and complexon (5-300 mg/L). Its advantages are simple operation, and quick and visual test.
Description
The present invention relates to the test paper of quick determination for water hardness.
The measured value of determining total hardness of water all is an important parameters in process water and people's lives potable water in the water body, and especially in boiler feed water, what show in dyeing water and the industrial recirculated water is even more important.
Its classical way of mensuration for determining total hardness of water in the water body is the EDTA titrimetry, and the continuous development along with science and technology has increased a lot of instrumental methods again, as: emission spectrum, atomic absorption spectrophotometry, ionic spectrum and ionometer etc.In the said determination method, but any method all need drop into suitable expense, and especially instrument analytical method all needs certain experiment condition, as analytical test chamber, specialty analysis personnel, analytical instrument and equipment and sufficient analytical test time.The water inlet boiler consumption that only needs to measure total hardness in China and even the whole world just can ten million meter.All will consume great amount of manpower and material resources, financial resources every year.
The object of the present invention is to provide a kind of test paper for determining total hardness of water, it is a kind of test paper of fast measuring determining total hardness of water, not only do not need the investment of analytical test chamber, specialty analysis personnel, various instrument and equipments, and it is pollution-free and can in the several seconds, in time obtain total hardness value comparatively accurately, for commercial production in time provides scientific basis, for country saves great amount of manpower and material resources and financial resources, can create considerable economic.
The present invention is made of substrate and colour developing indicator paper block, and substrate is common cardboard, self-adhesive paper or sheet plastic, and indicator paper block is the blank sheet of paper of common filter paper or suction; Indicator paper block sticks on the substrate, and indicator paper block is that the mixed liquor that has flooded azo dyes, sodium tetraborate and disodium EDTA (EDTA) is made.
The process for preparation of indicator paper block immersion liquid of the present invention is as follows: the solution of preparing immersion liquid base fluid azo dyes 1.0-5.0g/L, sodium tetraborate 10-20g/L at first respectively with the EDTA solution of the identical German degree equivalent of measuring of indicator paper block, be indicator paper block immersion liquid behind three kinds of solution mixings corresponding to a kind of German degree.Other is prepared respectively with the corresponding immersion liquid of different German degree, only changes the amount of EDTA, and promptly EDTA measures and corresponding German degree equivalent, and the amount of EDTA is 5-300mg/L, and the amount of azo dyes and sodium tetraborate is constant.It is 10mg/L or for 0.178mmol/L (water environment protection method standard operation manuals, Technology Standards Division of State Bueau of Environmental Protection, 1998.2) that above-mentioned said German degree, 1 Deutschland hardness are equivalent to CaO content.
Concrete preparation process of the present invention is: indicator paper block be impregnated in 3-5 takes out second in the above-mentioned immersion liquid, drying at room temperature or oven dry under 50 ℃, obtain the test paper of light blue purple, be made into standard size (colour developing paper piece again as 0.5 * 0.5 or 0.5 * 0.3cm), then the colour developing paper of the German number of degrees of difference (for example: 0.5d, 1.0,2.0,3.0,4.0,5.0 etc.) is sticked on the substrate by the gradient of variable concentrations, promptly made mensuration total hardness of water test paper, put it in the small plastic box, seal up for safekeeping in polybag, place shady and cool dry place and preserve.
Total hardness of water test paper of the present invention can be made two kinds: extensive test paper: 5-30
0D (German degree), precision＜± 2.5
0D; Precision test paper: 0.5-5
0D (German degree), precision＜± 0.5
0D.
When the present invention uses, carefully take out a slice test paper plate, this test paper is easily contaminated, water-immersed part when noting not wanting touching test does not make other not test paper plate contamination of usefulness yet, and it is immersed in the solution to be measured, supernatant liquid is got rid of in extraction gently rapidly, and 5-10 can determine the total hardness of water value in second.
During the present invention is applicable to, the softening processing controls and the ground of feedwater such as low-pressure boiler, printing and dyeing, the on-the-spot Hardness Determination of underground and drinking water quality.Simple to operate, quick, directly perceived with this kind test paper for determining total hardness, need not laboratory, professional laboratory personnel and equipment, and can directly accurately determine its determining total hardness of water whether (by standards such as country, portion, industries) up to standard.The present invention's measured value error in actual applications can be controlled in ± 0.5 German degree in, can satisfy the mensuration requirement of water hardness fully, therefore, the present invention has tangible economy and environmental benefit.
Outstanding substantive distinguishing features of the present invention can be tested the example from following enforcement and be embodied.
Embodiment
1. test paper preparation
Take by weighing respectively 17.5 the gram sodium tetraborates and 1 the gram azo dyes be dissolved in water, be settled to 1000 milliliters, make base fluid; The disodium EDTA that in 1000 milliliters of base fluids, adds 5 milligrams, 10 milligrams, 20 milligrams, 30 milligrams, 40 milligrams and 50 milligrams respectively, dissolving is evenly made respectively and German degree 0.5,1.0,2.0,3.0,4.0,5.0 corresponding indicator paper block immersion liquid.Immerse 3-5 second in the immersion liquid respectively with quantitative filter paper, take out, natural airing is cut into 0.5 * 0.5 blockage, from bottom to up according to 0.5 → 5.0
0D has six indicator paper blocks to increase order gradually to be affixed on the sheet plastic, and the dress box is the quick determination for water hardness test paper, seals standby.
2. the mensuration of determining total hardness of water
The quick determination for water hardness test paper of being checked (following letter mark test paper), its six indicated value amount position pieces, i.e. 0.5,1.0,2.0,3.0,4.0 and 5.0 German degree.Water sample in this durometer level takes out after about 1 second when test paper immerses water sample, then 5-10 in second according to indicator paper block number number and its depth degree by red stain indigo plant, can draw the hardness of this water quality of showing with German kilsyth basalt.Six blue purple indicator paper blocks of light orchid all become pink, and the German degree in determining total hardness of water＜0.5 is described.Six light blue purple indicator paper blocks have only two to become sky blue, and all the other are pink, illustrate that determining total hardness of water is 1.0 German degree.Six light blue purple indicator paper blocks have only three to become sky blue, and the 4th is that sky blue mixes with pink, illustrates that determining total hardness of water is 2.5 German degree.Six light blue purple indicator paper blocks all become sky blue, determining total hardness of water are described greater than 5.0 German degree, should change extensive test paper into and measure.
1. test paper bioassay standard solution
The standard solution of different German degree is that (Ca, Mg content are respectively 1, and 000mg/g) stepwise dilution is formulated, and wherein calcium is 9: 1 with the hardness content ratio of magnesium by the calcium of State Standard Matter Research Centre's development and magnesium standard substance.Table 1 is to use test paper to measure the result of the accurate solution of different German scales.
2. the mensuration of water sample hardness
The water sample of being checked is respectively a phreatic water, three kinds of tap water and boiler softening waters.Method of testing is ionic light spectrometry and test paper method.Its measurement result is listed in table 2.Table 1
Annotate 1: 0.25,0.50,0.75th in the measured value behind the radix point, determine visual error 0.25 according to the depth of the change color of indicator paper block by visual.Table 2
Annotate 2: the chromatography of ions is as one of standard method of measuring calcium, magnesium in the water quality, and its precision is controlled at ± and 5%.A is 5 times of dilutions, and b is 12.5 times of dilutions, and c is 2 times of measured values of dilution.
Claims (4)
1. a test paper for determining total hardness of water is characterized in that it is to be made of substrate and colour developing indicator paper block, and indicator paper block sticks on the substrate, and indicator paper block has flooded the mixed liquor of azo dyes, sodium tetraborate and disodium EDTA (EDTA); The content of said mixed liquor: azo dyes 1-5 gram/L, sodium tetraborate 10-20 gram/L and disodium EDTA 5-300 milligram/L.
2. according to the said test paper for determining total hardness of water of claim 1, it is characterized in that the content of said mixed liquor: azo dyes 1 gram/L, sodium tetraborate 17.5 gram/L and disodium EDTA 5-300 milligram/L.
3. according to the said test paper for determining total hardness of water of claim 1, it is characterized in that said substrate is common cardboard, self-adhesive paper or sheet plastic, indicator paper block is the blank sheet of paper of common filter paper or suction;
4. the preparation method of the said test paper for determining total hardness of water of claim 1 is characterized in that:
(1) at first by metering preparation azo dyes, sodium tetraborate and with the mixed solution of the disodium EDTA of German degree equivalent, as indicator paper block immersion liquid corresponding to a kind of German degree;
(2) indicator paper block be impregnated in 3-5 takes out second in the above-mentioned immersion liquid, drying at room temperature or oven dry under 50 ℃, be made into the colour developing paper piece of standard size 0.5 * 0.5 or 0.5 * 0.3cm again, then the colour developing paper of the different number of degrees gradient by variable concentrations sticked on the substrate, get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99111693 CN1247311A (en) | 1999-08-24 | 1999-08-24 | Test paper for determining total hardness of water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99111693 CN1247311A (en) | 1999-08-24 | 1999-08-24 | Test paper for determining total hardness of water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1247311A true CN1247311A (en) | 2000-03-15 |
Family
ID=5275232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99111693 Pending CN1247311A (en) | 1999-08-24 | 1999-08-24 | Test paper for determining total hardness of water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1247311A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
1999
- 1999-08-24 CN CN 99111693 patent/CN1247311A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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