CN101936978B - Method for on-line measurement of ammonia nitrogen content in water by recycling same reagent - Google Patents
Method for on-line measurement of ammonia nitrogen content in water by recycling same reagent Download PDFInfo
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- CN101936978B CN101936978B CN2009101002380A CN200910100238A CN101936978B CN 101936978 B CN101936978 B CN 101936978B CN 2009101002380 A CN2009101002380 A CN 2009101002380A CN 200910100238 A CN200910100238 A CN 200910100238A CN 101936978 B CN101936978 B CN 101936978B
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Abstract
The invention relates to a method for on-line measurement of ammonia nitrogen content in water by recycling the same reagent in the field of water analysis, comprising the following steps: respectively injecting an indicator, a first water sample and an ejected solution in a colorimetric pond and an ejected pond, and performing ejected color comparison to obtain the ammonia nitrogen value of the first water sample; and taking the ammonia nitrogen value of the indicator as a base point value instead of discharging the indicator in the colorimetric pond, directly measuring the ammonia nitrogen values of a second water sample, a third water sample,...and an Nth water sample until the ammonia nitrogen value measured at the Nth times exceeds the ammonia nitrogen measurement range of an instrument, replacing the indicator in the colorimetric pond and making preparation for ammonia nitrogen measurement of the next round. The method in the invention completes measurement on the ammonia nitrogen values of different water samples by recycling the indicator in primary sample injection, thus saving the use cost of the reagent, prolonging the maintenance period of the instrument (2-3 times of the current instrument maintenance period) and reducing secondary pollution caused by large dosage of the reagent.
Description
Technical field
The present invention relates to the assay method of ammonia-nitrogen content in a kind of water quality monitoring and the analysis field, specifically, relate to the method for ammonia-nitrogen content in a kind of indicator recycling on-line determination water.
Background technology
Ammonia nitrogen is meant with free ammonia and (or claims non-ionic ammonia, NH in the water
3) and ion ammonia (NH
4 +) nitrogen that form exists, both ratio of componentss depend on the pH value and the water temperature of water.The source of ammonia nitrogen is mainly itrogenous organic substance in the pollution source such as sanitary sewage, some industrial waste water and agricultural drain and receives the product that decomposes behind the microbial action in the water.When ammonia-nitrogen content is higher, fish are presented toxic action, human body is also had harm in various degree.Measure the nitrogen compound of various forms in the water, help to estimate the contaminated degree of water body and " self-cleaning " situation.Therefore, ammonia-nitrogen content is an important indicator of surface water, industrial waste water and Drinking Water monitoring in the water.What at present, the ammonia nitrogen in-line analyzer adopted on the market is the ammonia nitrogen of evicting from the colorimetric method for determining water.The principle of work of this method is with being mixed with a kind of reaction reagent by analytic sample; Ion ammonia in the solution is changed into ammonia; Thereby from being discharged the analytic sample, ammonia is evicted from and transferred in the colorimetric pool, ammonia is dissolved in the indication solvent again; According to the indicator solution change in color, measure ammonia nitrogen content through colourimetry.Behind the intact water sample of every survey; The indicator of excessive sample introduction with evict liquid from and just do not re-use, but directly drain as waste liquid, not only caused indicator and the serious waste of evicting liquid from; Increased the maintenance cost of instrument; But also, prolonged water sample test period owing to will clean colorimetric pool and evict the pond from, be unfavorable for fast measuring ammonia nitrogen value.In addition, still there are the indicator of ammonia nitrogen determination ability and the discharge of evicting liquid from also can cause serious secondary pollution.
Difference of the present invention is, in range of liner, and the concentration through improving indicator and change corresponding microcomputer Processing Program, thus realizing that same indicator can repeatedly reuse measures ammonia nitrogen content in the water sample.
Summary of the invention
The invention provides the method for ammonia-nitrogen content in a kind of same reagent recycling on-line determination water; Specifically, provide a kind of same indicator recycling that can reduce ammonia nitrogen determination cost, raising reagent utilization factor, shortening mensuration cycle to measure the new method of ammonia-nitrogen content in the water.
To achieve these goals, the present invention adopts following technical scheme:
Indicator is injected colorimetric pool, again with first part of water sample with evict liquid from and inject and to evict the pond from, open air pump air-blowing in colorimetric pool and evict colorimetric from, and calculate the ammonia nitrogen value of measuring gained for the first time, i.e. the ammonia nitrogen value of first part of water sample; Do not discharge the indicator in the colorimetric pool.For the second time before the test; Redeterminate the ammonia nitrogen value in the indicator earlier; Carry out the mensuration of second part of water sample ammonia nitrogen value with ammonia nitrogen value in the indicator as basic point again, deduct the basic point value with the ammonia nitrogen value of measuring for the second time gained then, can obtain the ammonia nitrogen value of second part of water sample; Method is according to this reused the ammonia nitrogen value that reagent in the colorimetric pool is measured N part water sample always, and then the ammonia nitrogen value of the N part water sample ammonia nitrogen value that equals to measure for the N time gained deducts (N-1) inferior basic point value; When the ammonia nitrogen value of the N time mensuration gained exceeds the ammonia nitrogen testing range of instrument, change the reagent in the colorimetric pool, begin the ammonia nitrogen determination of a new round again.This process can be represented with Fig. 1.
Indicator according to the invention is bromthymol blue solution or nessler reagent.
The concentration of bromthymol blue solution according to the invention is 1%-10% (mass/volume number percent).
The liquid of evicting from of the present invention is sodium hydroxide solution.
Concentration of sodium hydroxide solution of the present invention is 0.01mol/L-0.5mol/L.
This method has realized repeatedly reusing the mensuration that same indicator is accomplished many parts of water sample ammonia-nitrogen contents; Improved the utilization factor of indicator on the one hand; Reduced the testing cost of water sample; Prolong the maintenance period 2-3 of ammonia nitrogen analyzer maintenance period on the market (be doubly) of instrument on the other hand greatly, reduced the secondary pollution that causes greatly because of reagent dosage.
Description of drawings
The microcomputer Processing Program synoptic diagram of Fig. 1 water sample ammonia nitrogen value
Embodiment
Embodiment 1
The employing tradition evicts colourimetry from and new method provided by the present invention is measured 20 parts of water sample ammonia nitrogen values.As shown in table 1 by the result of these two kinds of methods analyst gained and the dose indicating that consumed.The experimentation of method provided by the present invention is following: with 3ml concentration is that 1% bromthymol blue solution injects colorimetric pool; Evict first part of water sample of 1ml and the injection of 1ml 0.01mol/L sodium hydroxide solution from pond again; Open air pump air-blowing in colorimetric pool and evict colorimetric from; The ammonia nitrogen value that obtains measuring for the first time gained is 2.5, and promptly the ammonia nitrogen value of first part of water sample is 2.5; Do not discharge the indicator in the colorimetric pool; For the second time before the test, the ammonia nitrogen value that redeterminates in the indicator is 1.4, carries out the mensuration of second part of water sample ammonia nitrogen value with this as basic point, deducts basic point value 1.4 with the ammonia nitrogen value 3.7 of measuring for the second time gained then, and the ammonia nitrogen value that promptly obtains second part of water sample is 2.3; Method according to this, reuse the ammonia nitrogen value that reagent in the colorimetric pool records the 10th part of water sample is 2.7 always.
Table 1 adopts tradition to evict colourimetry from and new method of the present invention is measured 20 parts of water sample ammonia nitrogen value results relatively
Embodiment 2
The employing tradition evicts colourimetry from and new method provided by the present invention is measured 10 parts of water sample ammonia nitrogen values.As shown in table 2 by the result of these two kinds of methods analyst gained and the dose indicating that consumed.The experimentation of method provided by the present invention is following: with 3ml concentration is that 5% bromthymol blue solution injects colorimetric pool; Evict first part of water sample of 1ml and the injection of 1ml 0.2mol/L sodium hydroxide solution from pond again; Open air pump air-blowing in colorimetric pool and evict colorimetric from; The ammonia nitrogen value that obtains measuring for the first time gained is 4.9, and promptly the ammonia nitrogen value of first part of water sample is 4.9; Do not discharge the indicator in the colorimetric pool; For the second time before the test, the ammonia nitrogen value that redeterminates in the indicator is 4.9, carries out the mensuration of second part of water sample ammonia nitrogen value with this as basic point, deducts basic point value 4.9 with the ammonia nitrogen value 8.9 of measuring for the second time gained then, and the ammonia nitrogen value that promptly obtains second part of water sample is 4.0; Method according to this, reuse the ammonia nitrogen value that reagent in the colorimetric pool records the 10th part of water sample is 3.8 always.
Table 2 adopts tradition to evict colourimetry from and new method of the present invention is measured 10 parts of water sample ammonia nitrogen value results relatively
Embodiment 3
The employing tradition evicts colourimetry from and new method provided by the present invention is measured 15 parts of water sample ammonia nitrogen values.As shown in table 3 by the result of these two kinds of methods analyst gained and the dose indicating that consumed.The experimentation of method provided by the present invention is following: with 3ml concentration is that 10% bromthymol blue solution injects colorimetric pool; Evict first part of water sample of 1ml and the injection of 1ml 0.5mol/L sodium hydroxide solution from pond again; Open air pump air-blowing in colorimetric pool and evict colorimetric from, the ammonia nitrogen value that obtains measuring for the first time gained is that 14.9 ammonia nitrogen values are the indicator in 14.9 colorimetric pools; For the second time before the test, redeterminate ammonia nitrogen value in the indicator and be 14.9 for basic point carries out the mensuration of second part of water sample ammonia nitrogen value, deduct basic point value 14.9 with the ammonia nitrogen value 30.0 of measuring gained the second time then, the ammonia nitrogen value that promptly obtains second part of water sample is 15.1; Method according to this, reuse the ammonia nitrogen value that reagent in the colorimetric pool records the 15th part of water sample is 15.4 always.
Table 3 adopts tradition to evict colourimetry from and new method of the present invention is measured 15 parts of water sample ammonia nitrogen value results relatively
Claims (5)
1. the method for ammonia-nitrogen content in the same reagent recycling on-line determination water; It is characterized in that: indicator is injected colorimetric pool; Again with first part of water sample with evict liquid from and inject and to evict the pond from; Open air pump and will evict gas in the pond from and take out to colorimetric pool and evict colorimetric from, and calculate the ammonia nitrogen value of measuring gained for the first time, i.e. the ammonia nitrogen value of first part of water sample; Do not discharge the indicator in the colorimetric pool; For the second time before the test; Redeterminate the ammonia nitrogen value in the indicator earlier; Carry out the mensuration of second part of water sample ammonia nitrogen value with ammonia nitrogen value in the indicator as basic point again, deduct the basic point value with the ammonia nitrogen value of measuring for the second time gained then, can obtain the ammonia nitrogen value of second part of water sample; Method is according to this reused the ammonia nitrogen value that reagent in the colorimetric pool is measured N part water sample always, and then the ammonia nitrogen value of the N part water sample ammonia nitrogen value that equals to measure for the N time gained deducts (N-1) inferior basic point value; When the ammonia nitrogen value of the N time mensuration gained exceeds the ammonia nitrogen testing range of instrument, change the finger reagent in the colorimetric pool, begin the ammonia nitrogen determination of a new round again.
2. method according to claim 1 is characterized in that: said indicator is bromthymol blue solution or nessler reagent.
3. method according to claim 2 is characterized in that: the bromthymol blue solution concentration is 1%-10% (a mass/volume number percent).
4. method according to claim 1 is characterized in that: the said liquid of evicting from is sodium hydroxide solution.
5. method according to claim 4 is characterized in that: said concentration sodium hydroxide scope is 0.01mol/L-0.5mol/L.
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| CN2009101002380A CN101936978B (en) | 2009-07-02 | 2009-07-02 | Method for on-line measurement of ammonia nitrogen content in water by recycling same reagent |
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| CN2009101002380A CN101936978B (en) | 2009-07-02 | 2009-07-02 | Method for on-line measurement of ammonia nitrogen content in water by recycling same reagent |
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| CN101936978B true CN101936978B (en) | 2012-01-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3020130A (en) * | 1959-08-06 | 1962-02-06 | Technicon Instr | Digestion apparatus and method |
| CN101226153A (en) * | 2007-12-25 | 2008-07-23 | 洪陵成 | Method and apparatus for testing flow injection ammonia nitrogen color comparison |
| JP4157363B2 (en) * | 2002-11-08 | 2008-10-01 | 財団法人材料科学技術振興財団 | Concentration profile calibration method and concentration profile analysis processing apparatus |
| CN201247231Y (en) * | 2008-09-01 | 2009-05-27 | 熊猫电子集团有限公司 | Device for stirring alkaline air reaction |
| CN201247202Y (en) * | 2008-09-01 | 2009-05-27 | 熊猫电子集团有限公司 | Color comparison apparatus for measuring alkaline air quantity |
-
2009
- 2009-07-02 CN CN2009101002380A patent/CN101936978B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3020130A (en) * | 1959-08-06 | 1962-02-06 | Technicon Instr | Digestion apparatus and method |
| JP4157363B2 (en) * | 2002-11-08 | 2008-10-01 | 財団法人材料科学技術振興財団 | Concentration profile calibration method and concentration profile analysis processing apparatus |
| CN101226153A (en) * | 2007-12-25 | 2008-07-23 | 洪陵成 | Method and apparatus for testing flow injection ammonia nitrogen color comparison |
| CN201247231Y (en) * | 2008-09-01 | 2009-05-27 | 熊猫电子集团有限公司 | Device for stirring alkaline air reaction |
| CN201247202Y (en) * | 2008-09-01 | 2009-05-27 | 熊猫电子集团有限公司 | Color comparison apparatus for measuring alkaline air quantity |
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