CN100422719C - Minim chlorine ion test method for furnace water - Google Patents
Minim chlorine ion test method for furnace water Download PDFInfo
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- CN100422719C CN100422719C CNB2007100161198A CN200710016119A CN100422719C CN 100422719 C CN100422719 C CN 100422719C CN B2007100161198 A CNB2007100161198 A CN B2007100161198A CN 200710016119 A CN200710016119 A CN 200710016119A CN 100422719 C CN100422719 C CN 100422719C
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- Prior art keywords
- chloride ion
- testing
- chlorion
- water
- perchloric acid
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 35
- 238000010998 test method Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims abstract description 21
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims abstract description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 239000012086 standard solution Substances 0.000 claims abstract description 14
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 31
- 241000370738 Chlorion Species 0.000 claims description 30
- 239000000460 chlorine Substances 0.000 claims description 29
- 238000002835 absorbance Methods 0.000 claims description 24
- 239000012498 ultrapure water Substances 0.000 claims description 21
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 229910052801 chlorine Inorganic materials 0.000 claims description 16
- DXUPZCASGCUOJL-UHFFFAOYSA-N CO.N#CS Chemical compound CO.N#CS DXUPZCASGCUOJL-UHFFFAOYSA-N 0.000 claims description 15
- TVBSSDNEJWXWFP-UHFFFAOYSA-N nitric acid perchloric acid Chemical compound O[N+]([O-])=O.OCl(=O)(=O)=O TVBSSDNEJWXWFP-UHFFFAOYSA-N 0.000 claims description 13
- 238000012546 transfer Methods 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- LJBWEZVYRBKOCI-UHFFFAOYSA-N 2,4,6-triaminoquinazoline Chemical compound N1=C(N)N=C(N)C2=CC(N)=CC=C21 LJBWEZVYRBKOCI-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229960002523 mercuric chloride Drugs 0.000 claims description 4
- LWJROJCJINYWOX-UHFFFAOYSA-L mercury dichloride Chemical compound Cl[Hg]Cl LWJROJCJINYWOX-UHFFFAOYSA-L 0.000 claims description 4
- LGZXYFMMLRYXLK-UHFFFAOYSA-N mercury(2+);sulfide Chemical compound [S-2].[Hg+2] LGZXYFMMLRYXLK-UHFFFAOYSA-N 0.000 claims description 4
- 238000006467 substitution reaction Methods 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 238000005352 clarification Methods 0.000 claims description 3
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000012224 working solution Substances 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 abstract 2
- 241001632576 Hyacinthus Species 0.000 abstract 1
- GBZANUMDJPCQHY-UHFFFAOYSA-L mercury(ii) thiocyanate Chemical compound [Hg+2].[S-]C#N.[S-]C#N GBZANUMDJPCQHY-UHFFFAOYSA-L 0.000 abstract 1
- 238000002798 spectrophotometry method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000004587 chromatography analysis Methods 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 150000002730 mercury Chemical class 0.000 description 2
- 238000003918 potentiometric titration Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Abstract
The invention discloses a testing method for trace chloride ion in boiler water. It solves problems that testing accuracy for trace chloride ion in boiler water in current power plant is not high and filed test can not be carried out. It is provided with simple method, quick and accurate test in field and obtaining testing result in time so on. The method is that mixed solution of ferric nitrate and perchloric acid is added into the standard solution of chloride ion; mixed solution of mercury thiocyanate and methyl alcohol is added to form stable hyacinth complex compound; of which absorbency A of the complex compound deducting blank absorbency A0, namely (A-A0) and the chloride ion content C have smooth curve relation in the range of 0-6000CI- mu g/L; on the curve chloride ion content is fetched in 0-1000CI- mu g/L to build linear relation equation of absorbency (A-A0) and the chloride ion content C, namely (A-A0) =a+bC; testing water sample is fetched; the absorbency A is made to deduct the blank absorbency A0; chloride ion content is checked out from the line or it is calculated from the regression equation; the testing process is accomplished.
Description
Technical field
The present invention relates to a kind of chlorine ion test method, relate in particular to trace chlorine method of testing in a kind of boiler water in thermal power plants.
Background technology
Chloride ion content is an important control index of Power Plant Water Vapor.Water quality kind in power plant water and the water-steam system is more, as: middle water, recirculated cooling water, Yuan Shui (comprising well water, reservoir water, tap water, river etc.), counter-infiltration water outlet, Lu Shui, condensate water, demineralized water, feedwater and various steam etc.The mensuration of chlorion in these water, national standard and power industry standard have been stipulated many method of testings, as: mole method, potentiometric titration, mercury salt titrimetry, PCl electrode method, co-precipitation enrichment spectrophotometric method, chromatography of ions or the like.Every kind of method has all been stipulated the scope of application, and wherein mole method, potentiometric titration, mercury salt titrimetry, PCl electrode method etc. lack enough sensitivity for the mensuration of trace chlorine, can't satisfy the requirement of measuring trace chlorine.The measurement range of co-precipitation enrichment spectrophotometric method is 10～100 μ g/L, and the stove water chloride ion content of many power plant is generally greater than this scope, and adopts the precipitation enrichment method in the test, as on-the-spot detection means inconvenience is arranged more.Though the chromatography of ions can detect trace chlorine, used instrument costs an arm and a leg, and the environmental requirement strictness at no distant date can't be widely as on-the-spot detection means.Have report to measure the method for chlorion such as flow injection spectrophotometric method, atomic absorption spectrophotometry luminosity indirect method, though can detect trace chlorine, there are problems such as pump valve is easily revealed, pump line is easily aging used instrument in the former; Latter's existence costs an arm and a leg, and therefore problems such as environmental requirement strictness also are difficult for as on-the-spot detection means.For the mercuric thiocyanate spectrophotometry chlorion that report is arranged, because of its method is not careful, imperfection, ignored the blank absorbency problem, cause analyst's data computation mistake, can not correctly measure stove water chloride ion content.
Summary of the invention
It is not high in order to solve in the present power plant stove water testing accuracy for trace chloride ion that purpose of the present invention is exactly, and the checkout equipment that can carry out the trace level chlorion costs an arm and a leg again, and scene detection is carried out in inconvenience; Problems such as the method that has is not careful, imperfection even the data that make the mistake provide that a kind of to have method simple, easy to operate, can carry out at the scene fast, accurately detect, and in time obtain trace chlorine method of testing in the stove water of advantages such as testing result.
For achieving the above object, the present invention adopts following technical scheme:
Trace chlorine method of testing in a kind of stove water, its method be,
A, preparation high purity water, 0.15mol/L-2.5mol/L ferric nitrate-perchloric acid solution, 0.2% mercuric thiocyanate-methanol solution and chlorion standard solution are stand-by;
Wherein, high-purity electrical conductivity of water is less than 0.1 μ s/cm;
The chlorion concentration of standard solution is 1mg/mL Cl
-
Ferric nitrate-perchloric acid solution preparation is to get the 25-35 gram to analyze pure ferric nitrate in beaker, and the top grade of gradation adding 100-110mL70-72% is pure or analyze pure perchloric acid, and stirring, dissolving are diluted to 500mL with high purity water again, put into brown reagent bottle;
Mercuric thiocyanate-methanol solution is to analyze 0.8-1.2 gram pure or top grade bright sulfur mercuric cyanate pressed powder directly changes in the 450-550mL absolute methanol solvent, shake, it is put in the brown bottle, leave standstill and make it clarification at least more than 24 hours, obtain the mercuric thiocyanate-methanol solution of 0.2% concentration, and get upper clear supernate and use;
B, in the chlorion standard solution, add ferric nitrate-perchloric acid solution, add mercuric thiocyanate-methanol solution again, make chlorion in the perchloric acid medium with the mercuric thiocyanate reaction, generate mercuric chloride and also discharge SCN
-SCN then
-With Fe
3+Form stable Chinese red complex compound, the absorbance A deduction blank absorbency A of this complex compound
0I.e. (A-A
0) with the content C of chlorion at 0 ~ 6000 μ g/L Cl
-In the scope is smooth curved line relation; Getting chloride ion content on this curve is 0 ~ 1000 μ g/L Cl
-Scope in this scope, is set up absorbance (A-A
0) with the linear relation equation of chloride ion content C, i.e. (A-A
0)=a+b C;
C, get water determination to be detected, will record water sample absorbance A deduction blank absorbency A
0, check in chloride ion content or the substitution regression equation calculation goes out chloride ion content from straight line, finish test process.
Among the described step a, ferric nitrate is 30.3 grams; The 70-72% top grade is pure or analyze pure perchloric acid 107ml.
Among the described step a, analyze pure or top grade bright sulfur mercuric cyanate pressed powder be 1 the gram; Absolute methanol is 500ml.
Among the described step a, chlorion titer preparation is to get the pure or pure NaCl of top grade of 3-4 gram benchmark to place in the porcelain crucible, is warmed up to 450-550 ℃ in high temperature furnace, calcination 8-12 minute, be cooled to room temperature then in exsiccator, getting 1-2 gram NaCl, to obtain concentration with the high purity water dissolving be 1mg/mL Cl
-The chlorion standard solution.
Described high temperature furnace temperature is 500 ℃, and calcination time is 10 minutes; NaCl is 1.6485 grams.
Among the described step b, when measuring absorbance A, get in the chlorion standard solution injection capacity bottle, dash to setting scale, shake up, transfer in the conical flask with high purity water; Add an amount of ferric nitrate-perchloric acid solution respectively with transfer pipet, shake up, add an amount of mercuric thiocyanate-methanol solution again and shake up, place a period of time; On the 721-100 spectrophotometer, make reference with the 100mm cuvette with high purity water, measure absorbance.
Among the described step b, corresponding 0 ~ 1000 μ g/L Cl
-Typical curve the time, its assay method injects one group of 50mL volumetric flask for getting some milliliters 10 μ g/mL chlorion working solutions respectively, dashes to scale with high purity water then, shakes up, and transfers in the 100mL conical flask; Add 5.0mL ferric nitrate-perchloric acid solution respectively with transfer pipet, shake up, add 2.0mL0.2% mercuric thiocyanate-methanol solution again and shake up, placed 5 minutes; Use the 721-100 spectrophotometer, wavelength is 100mm for the 460nm cuvette, makes reference with high purity water, measures absorbance; And with absorbance (A-A
0) be ordinate, chloride ion content C is a horizontal ordinate, draws (A-A
0) ~ C straight line or calculating regression equation.
The present invention is in the solution of chloride ion-containing, and chlorion and mercuric thiocyanate react, and generates mercuric chloride and discharges SCN
-In the perchloric acid medium, Fe
3+With SCN
-Form stable Chinese red complex compound, the absorbance (A-A of this complex compound
0) with the content C of chlorion at 0 ~ 1000 μ g/L Cl
-Relation is in line in the scope; And 460nm is a maximum absorption wavelength.
The invention has the beneficial effects as follows: method is simple, quick, sensitive, and accurately, the instrument maintenance workload is few, is fit to rig-site utilization, does not need to precipitate enrichment method, just can measure trace chlorine.
Embodiment
The invention will be further described below in conjunction with example.
The present invention utilizes chlorion and mercuric thiocyanate to react, and generates mercuric chloride and discharges SCN
-In the perchloric acid medium, Fe
3+With SCN
-Form the complex compound of stable Chinese red, the absorbance of this complex compound and the content of chlorion are at 0 ~ 1000 μ g/L Cl
-Relation is in line in the scope.Draw (A-A
0)-C straight line or with solution absorbency (A-A
0) carry out regression Calculation with concentration C, get regression equation: A-A
0=a+b C.
At first, it is stand-by to get high purity water, ferric nitrate-perchloric acid solution, mercuric thiocyanate-methanol solution and chlorion titer.
Described high purity water, its conductivity satisfy less than 0.1 μ s/cm; Described 0.15mol/L-2.5mol/L ferric nitrate-perchloric acid solution, be to analyze pure ferric nitrate gradation with 30.3 grams to add the top grade of 107mL70-72% pure or analyze pure perchloric acid, stir, dissolve, use the high purity water solution dilution again, put into brown reagent bottle to 500mL; Described 0.2% mercuric thiocyanate-methanol solution is 1.0 grams to be analyzed pure or top grade bright sulfur mercuric cyanate pressed powder directly change in the 500mL absolute methanol solvent in the brown bottle, shakes, and leaves standstill and makes it clarification more than at least 24 hours, gets upper clear supernate and uses; Described chlorion titer is to get the pure or pure NaCl of top grade of 3-4 gram benchmark to place in the porcelain crucible, in high temperature furnace, be warmed up to 500 ℃, calcination 10 minutes is cooled to room temperature then in exsiccator, to make concentration to 1000mL be 1mg/mL Cl with high purity water dissolving and towards rare to get 1.6485 gram NaCl
-The chlorion standard solution or the national standard material-chlorion standard solution of purchase.
Instrument adopts 721-100 spectrophotometer, 100mm cuvette, 460nm wavelength
Secondly, the making of working curve and the foundation of regression equation
Get chlorion working solution 10 μ g/mL by the listed numerical value of table 1 and inject one group of 50mL volumetric flask, dash to scale, shake up, transfer in the 100mL conical flask with high purity water.
Table 10 ~ 1000 μ g/L Cl
-Typical curve L=100mm, λ=460nm
| The volumetric flask numbering | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Standard solution volume mL | 0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 |
| Be equivalent to chloride ion content μ g/L in the water sample | 0 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 |
| Absorbance A | |||||||||||
| Absorbance A-A 0 | 0 |
Add the above-mentioned ferric nitrate-perchloric acid solution of 5.0mL respectively with transfer pipet, shake up, add 2.0mL0.2% mercuric thiocyanate-methanol solution again and shake up, placed 5 minutes.
Use the 721-100 spectrophotometer, wavelength is 100mm for the 460nm cuvette, makes reference with high purity water, measures absorbance.
According to recording absorbance and corresponding chloride ion content, draw straight line A-A
0=a+b C or calculating regression equation..
The mensuration of water sample to be detected
Get VmL stove water water sample in the 50mL volumetric flask, add an amount of high purity water, shake up and transfer in the 100mL conical flask (water sample should be clarified, otherwise filters) to scale, add the developer color development by the formality of above-mentioned drawing curve after, measure absorbance.With the absorbance A deduction blank absorbency A that records
0, check in chloride ion content C or obtain chloride ion content C with regression equation from straight line.
The water sample result calculates:
X＝C*50/V
In the formula: C---the chloride ion content that from working curve, checks in, μ g/L; Or with the chloride ion content of regression equation calculation, μ g/L
V---draw the volume of water sample, mL.
X---chloride ion content in the water sample, μ g/L
Because the blank absorbency of this test is bigger, when the chloride ion content of calculation sample, the absorbance A of sample must be deducted blank absorbency A
0, with (A-A
0) substitution regression equation calculation chloride ion content, otherwise can produce very big test error, cause the test data mistake.Report spectrophotometry chloride ion content is arranged, and there is not clear and definite sample absorbance to cut substitution regression equation calculation again behind the blank absorbency in the method, although make the analyst according to same formality color development, but the chloride ion content result who obtains is wrong, can not correctly measure chloride ion content in the stove water.
Claims (7)
1. trace chlorine method of testing in the stove water is characterized in that: its method is,
A, preparation high purity water, 0.15mol/L-2.5mol/L ferric nitrate-perchloric acid solution, 0.2% mercuric thiocyanate-methanol solution and chlorion standard solution are stand-by;
Wherein, high-purity electrical conductivity of water is less than 0.1 μ s/cm;
The chlorion concentration of standard solution is 1mg/mL Cl
-
Ferric nitrate-perchloric acid solution preparation is to get the 25-35 gram to analyze pure ferric nitrate in beaker, and the top grade of gradation adding 100-110mL70-72% is pure or analyze pure perchloric acid, and stirring, dissolving are diluted to 500mL with high purity water again, put into brown reagent bottle;
Mercuric thiocyanate-methanol solution is to analyze 0.8-1.2 gram pure or top grade bright sulfur mercuric cyanate pressed powder directly changes in the 450-550mL absolute methanol solvent, shake, it is put in the brown bottle, leave standstill and make it clarification at least more than 24 hours, obtain the mercuric thiocyanate-methanol solution of 0.2% concentration, and get upper clear supernate and use;
B, in the chlorion standard solution, add ferric nitrate-perchloric acid solution, add mercuric thiocyanate-methanol solution again, make chlorion in the perchloric acid medium with the mercuric thiocyanate reaction, generate mercuric chloride and also discharge SCN
-SCN then
-With Fe
3+Form stable Chinese red complex compound, the absorbance A deduction blank absorbency A of this complex compound
0I.e. (A-A
0) with the content C of chlorion at 0 ~ 6000 μ g/L Cl
-In the scope is smooth curved line relation; Getting chloride ion content on this curve is 0 ~ 1000 μ g/L Cl
-Scope in this scope, is set up absorbance (A-A
0) with the linear relation equation of chloride ion content C, i.e. (A-A
0)=a+b C;
C, get water determination to be detected, will record water sample absorbance A deduction blank absorbency A
0, check in chloride ion content or the substitution regression equation calculation goes out chloride ion content from straight line, finish test process.
2. trace chlorine method of testing in the stove water according to claim 1 is characterized in that: among the described step a, ferric nitrate is 30.3 grams; The 70-72% top grade is pure or analyze pure perchloric acid 107ml.
3. trace chlorine method of testing in the stove water according to claim 1 is characterized in that: among the described step a, analyze pure or top grade bright sulfur mercuric cyanate pressed powder be 1 the gram; Absolute methanol is 500ml.
4. trace chlorine method of testing in the stove water according to claim 1, it is characterized in that: among the described step a, chlorion titer preparation is to get the pure or pure NaCl of top grade of 3-4 gram benchmark to place in the porcelain crucible, in high temperature furnace, be warmed up to 450-550 ℃, calcination 8-12 minute, be cooled to room temperature then in exsiccator, getting 1-2 gram NaCl, to obtain concentration with the high purity water dissolving be 1mg/mLCl
-The chlorion standard solution.
5. trace chlorine method of testing in the stove water according to claim 4 is characterized in that: described high temperature furnace temperature is 500 ℃, and calcination time is 10 minutes; NaCl is 1.6485 grams.
6. trace chlorine method of testing in the stove water according to claim 1 is characterized in that: among the described step b, when measuring absorbance A, get in the chlorion standard solution injection capacity bottle, dash to setting scale with high purity water, shake up, transfer in the conical flask; Add an amount of ferric nitrate-perchloric acid solution respectively with transfer pipet, shake up, add an amount of mercuric thiocyanate-methanol solution again and shake up, place a period of time; On the 721-100 spectrophotometer, make reference with the 100mm cuvette with high purity water, measure absorbance.
7. trace chlorine method of testing in the stove water according to claim 1 is characterized in that: among the described step b, and corresponding 0 ~ 1000 μ g/L Cl
-Typical curve the time, its assay method injects one group of 50mL volumetric flask for getting some milliliters 10 μ g/mL chlorion working solutions respectively, dashes to scale with high purity water then, shakes up, and transfers in the 100mL conical flask; Add 5.0mL ferric nitrate-perchloric acid solution respectively with transfer pipet, shake up, add 2.0mL0.2% mercuric thiocyanate-methanol solution again and shake up, placed 5 minutes; Use the 721-100 spectrophotometer, wavelength is 100mm for the 460nm cuvette, makes reference with high purity water, measures absorbance; And with absorbance (A-A
0) be ordinate, chloride ion content C is a horizontal ordinate, draws (A-A
0) ~ C straight line or calculating regression equation.
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|---|---|---|---|
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|---|---|---|---|
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| CN106596443A (en) * | 2016-11-30 | 2017-04-26 | 大工（青岛）新能源材料技术研究院有限公司 | Method for detecting chloride content of tap water |
| CN108072622A (en) * | 2017-12-29 | 2018-05-25 | 新津海天水务有限公司 | Chlorion rapid detection method in a kind of tap water |
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| CN110186981A (en) * | 2019-04-19 | 2019-08-30 | 九江德福科技股份有限公司 | A kind of Quantitative Monitoring method of chloride ion |
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| 血清中氯的吸光光度法测定. 徐海昇.理化检验-化学分册，第32卷第6期. 1996 |
| 血清中氯的吸光光度法测定. 徐海昇.理化检验-化学分册，第32卷第6期. 1996 * |
| 铋化学分析方法 蒸馏－硫氰酸汞分光光度法测定氯量. 中华人员共和国国家标准GB/T8220.8-1998. 1998 |
| 铋化学分析方法 蒸馏－硫氰酸汞分光光度法测定氯量. 中华人员共和国国家标准GB/T8220.8-1998. 1998 * |
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