CN109323997A - The method for building up of determining amount model applied to total phosphorus determination - Google Patents
The method for building up of determining amount model applied to total phosphorus determination Download PDFInfo
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- CN109323997A CN109323997A CN201811157290.5A CN201811157290A CN109323997A CN 109323997 A CN109323997 A CN 109323997A CN 201811157290 A CN201811157290 A CN 201811157290A CN 109323997 A CN109323997 A CN 109323997A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000011574 phosphorus Substances 0.000 title claims abstract description 58
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002835 absorbance Methods 0.000 claims abstract description 45
- 239000000243 solution Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000012086 standard solution Substances 0.000 claims description 12
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 4
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 4
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012937 correction Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 5
- 241000208340 Araliaceae Species 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000011964 heteropoly acid Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical compound O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 235000019394 potassium persulphate Nutrition 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of method for building up of determining amount model applied to total phosphorus determination comprising following steps: measuring the absorbance map of n different turbidity solution of limited quantity respectively, choosing is influenced maximum wavelength as compensation wavelength by turbidity；Absorbance A of the solution of n different turbidity of limited quantity at compensation wavelength and 700nm wavelength is measured respectivelyCompensationAnd A700, with ACompensationFor abscissa, A700For ordinate, linear fit is carried out using least square method and obtains A700With ACompensationBetween linear equation: A700=a1ACompensation‑b1；Obtain compensated absorbance: Ab=A700‑a1ACompensation‑b1；Linear fit is carried out using least square method, establishes compensated absorbance AbWith the unary linear relation of total phosphorus concentration C: C=a2Ab+b2.The present invention can effectively reduce turbidity error interference caused by total phosphorus determination, improve the accuracy and stability of total phosphorus content measurement, realize the on-line correction to turbidity.
Description
Technical field
The present invention relates to water quality inspection technique fields, are in more detail related to a kind of determining amount applied to total phosphorus determination
The method for building up of model.
Background technique
Total phosphorus is the total content of P elements in water body, is one of the index that water body is rich in organic matter.Phosphorus content can excessively draw
The undue growth of algae is played, water eutrophication occurs wawter bloom or red tide, upsets the balance of water body.Therefore, national environmental protection
Total phosphorus content is classified as one of the important monitor control index of water body by department.
Molybdate spectrophotometry is a kind of common water quality total phosphorus detection method, and principle is: being disappeared using potassium peroxydisulfate
Solve water sample, the phosphorous whole of water sample institute be oxidized to orthophosphates, orthophosphates in acid medium with molybdic acid reactant salt, in antimonic salt
In the presence of generate phosphato-molybdic heteropolyacid after by ascorbic acid restore generate blue complex compound, finally at 700nm wavelength measure
Absorbance, by the comparison with standard curve, calculating acquires total phosphorus concentration value.
But there are the accuracies that when turbidity, can seriously affect total phosphorus content detection in water sample.It is turbid in order to solve
Degree is influenced caused by measurement, and the method for configuration determining amount solution is proposed in National Standard Method.But the method is cumbersome, needs
In addition solution is configured, and measurement result is not sufficiently stable, suitable for application on total phosphorus on-line measuring device.
Therefore, establishing a kind of determining amount model applied to total phosphorus determination and carrying out on-line correction to turbidity has important meaning
Justice realizes accurately situation of change of the monitoring total phosphorus content in water environment to eliminate the influence that turbidity detects total phosphorus.
Summary of the invention
The purpose of the present invention is to provide a kind of method for building up of determining amount model applied to total phosphorus determination, Neng Gouyou
Effect reduces turbidity error interference caused by total phosphorus determination, improves the accuracy and stability of total phosphorus content measurement, realizes to turbid
The on-line correction of degree.
To achieve the goals above, the present invention provides a kind of foundation side of determining amount model applied to total phosphorus determination
Method comprising following steps:
(S1) the absorbance map of n different turbidity solution of limited quantity is measured respectively, and choosing is influenced maximum by turbidity
Wavelength as compensation wavelength；
(S2) extinction of the solution of n different turbidity of limited quantity at compensation wavelength and 700nm wavelength is measured respectively
Spend ACompensationAnd A700, with ACompensationFor abscissa, A700For ordinate, linear fit is carried out using least square method and obtains A700With ACompensationIt
Between linear equation:
A700=a1ACompensation-b1；
(S3) absorbance at 700nm wavelength is compensated using the absorbance at compensation wavelength, to eliminate turbidity to total phosphorus
The influence of detection obtains compensated absorbance:
Ab=A700-a1ACompensation-b1；
(S4) linear fit is carried out using least square method, establishes compensated absorbance AbWith the unitary of total phosphorus concentration C
Linear relationship:
C=a2Ab+b2。
Preferred embodiment in accordance with the present invention measures 5,10,30,60,100NTU turbidity in the step (S1) respectively
Under turbidity standard solution absorbance map, choosing is influenced maximum 490nm wavelength as compensation wavelength by turbidity；
Preferred embodiment in accordance with the present invention measures 5,10,30,60,100NTU turbidity in the step (S2) respectively
Under absorbance A of the turbidity standard solution at 490nm wavelength and 700nm wavelength490And A700, with A490For abscissa, A700For
Ordinate carries out linear fit using least square method and obtains A700With A490Between linear equation:
A700=0.549A490-0.001；
Preferred embodiment in accordance with the present invention is compensated in the step (S3) using the absorbance at 490nm wavelength
Absorbance at 700nm wavelength obtains compensated absorbance:
Ab=A700-0.549A490- 0.001=A700-a1A490-b1=lg (I700c/I700s)-a1lg(I490c/I490s)-b1=
a1lg I490s-lg I700s+lgI700c-a1lgI490c-b1
Wherein, I700c、I490cThe respectively transmitted light intensity that is measured at 700nm, 490nm wavelength of pure water, in this, as ginseng
Examine light intensity, I700s、I490sTransmitted light intensity of the solution respectively to be measured at 700nm, 490nm wavelength；
Preferred embodiment in accordance with the present invention establishes compensated absorbance A in the step (S4)bIt is dense with total phosphorus
Spend the unary linear relation of C:
C=a2Ab+b2=a2(a1lg I490s-lg I700s+lgI700c-a1lgI490c-b1)+b2
Wherein, a1=0.549, b1=0.001, I700c、I490cFor definite value, measure total phosphorus concentration C be respectively 0.05,0.1,
0.5,1.0, transmitted light intensity values I of the total phosphorus concentration standard solution of 1.5mg/L at 700nm and 490nm wavelength700s、I490s, ask
Corresponding a out1lgI490s-lgI700sValue, then with a1lgI490s-lgI700sValue be abscissa, C is ordinate, using most
Small square law is fitted to obtain the determining amount model of the transmitted light intensity of solution to be measured and total phosphorus concentration C: C=2.211lg
I490s-4.028lgI700s+10.03
Preferred embodiment in accordance with the present invention, the solution to be measured are potassium dihydrogen phosphate.
The above and other purposes of the present invention, feature, advantage will in the following detailed description, attached drawing and appended
Claim further clarify.
Detailed description of the invention
Fig. 1 is the method for building up of the determining amount model applied to total phosphorus determination of preferred embodiment in accordance with the present invention
Flow diagram；
Fig. 2 is the absorbance map of the different turbidity solution of preferred embodiment in accordance with the present invention；
Fig. 3 is the data table of comparisons of preferred embodiment in accordance with the present invention.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to invention, it should be noted that in not phase
Under the premise of conflict, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It defines in the following description
Basic principle of the invention can be applied to other embodiments, deformation scheme, improvement project, equivalent program and do not carry on the back
Other technologies scheme from the spirit and scope of the present invention.
It will be understood by those skilled in the art that in exposure of the invention, term " longitudinal direction ", " transverse direction ", "upper",
The orientation or position of the instructions such as "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore above-mentioned
Term is not considered as limiting the invention.
It is understood that term " one " is interpreted as " at least one " or " one or more ", i.e., in one embodiment,
The quantity of one element can be one, and in a further embodiment, the quantity of the element can be it is multiple, term " one " is no
It can be interpreted as the limitation to quantity.
Referring to Fig. 1 of attached drawing, the determining amount model applied to total phosphorus determination of preferred embodiment in accordance with the present invention
Method for building up will be elucidated in following description, can effectively reduce turbidity error interference caused by total phosphorus determination,
The accuracy and stability of total phosphorus content measurement are improved, realizes the on-line correction to turbidity.
It will be readily appreciated by those skilled in the art that total phosphorus yield is broadly divided into oxidation resolution, colour developing, detection three
Point, solution to be measured is subjected to oxidation resolution first, color developing agent is then added and is reacted, spectrophotometry is utilized after chromogenic reaction
The content of total phosphorus is measured.
As shown in Fig. 1, the determining amount model applied to total phosphorus determination method for building up the following steps are included:
(S1) the absorbance map of n different turbidity solution of limited quantity is measured respectively, and choosing is influenced maximum by turbidity
Wavelength as compensation wavelength；
(S2) extinction of the solution of n different turbidity of limited quantity at compensation wavelength and 700nm wavelength is measured respectively
Spend ACompensationAnd A700, with ACompensationFor abscissa, A700For ordinate, linear fit is carried out using least square method and obtains A700With ACompensationIt
Between linear equation:
A700=a1ACompensation-b1；
(S3) absorbance at 700nm wavelength is compensated using the absorbance at compensation wavelength, to eliminate turbidity to total phosphorus
The influence of detection obtains compensated absorbance:
Ab=A700-a1ACompensation-b1；
(S4) linear fit is carried out using least square method, establishes compensated absorbance AbWith the unitary of total phosphorus concentration C
Linear relationship:
C=a2Ab+b2。
It will be readily appreciated by those skilled in the art that can generate and dissipate to incident ray when solution is there are when certain turbidity
Absorption is penetrated, so that transmitted light intensity reduces, so that the absorbance at all wavelengths be made to increase, the measurement of total phosphorus content is caused to do
It disturbs.
Specifically, as shown in Fig. 2, in the step (S1), 5,10,30,60,100NTU turbidity are measured respectively
Under turbidity standard solution absorbance map, the curve in figure is followed successively by 5 from low to high, 10,30,60, under 100NTU turbidity
Absorbance curve.It can be obtained from the curve in figure, the absorbance at 490nm wavelength is most strong to the variation sensitivity of turbidity, thus
Choosing is influenced maximum 490nm wavelength as compensation wavelength by turbidity.
Correspondingly, in the step (S2), 5 are measured respectively, 10,30,60, the turbidity standard solution under 100NTU turbidity
Absorbance A at 490nm wavelength and 700nm wavelength490And A700.In standard curve, between absorbance and total phosphorus concentration at
Linear relationship, thus it is also in a linear relationship between the absorbance at different wave length.With A490For abscissa, A700For ordinate, benefit
Linear fit, which is carried out, with least square method obtains A700With A490Between linear equation:
A700=0.549A490-0.001。
In the step (S3), the absorbance at 700nm wavelength is compensated using the absorbance at 490nm wavelength, is obtained
To compensated absorbance:
Ab=A700-0.549A490- 0.001=A700-a1A490-b1=lg (I700c/I700s)-a1lg(I490c/I490s)-b1=
a1lg I490s-lg I700s+lgI700c-a1lgI490c-b1
Wherein, I700c、I490cThe respectively transmitted light intensity that is measured at 700nm, 490nm wavelength of pure water, in this, as ginseng
Examine light intensity.I700s、I490sTransmitted light intensity of the solution respectively to be measured at 700nm, 490nm wavelength.
Specifically, in the step (S4), compensated absorbance A is establishedbIt is linear with the unitary of total phosphorus concentration C
Relationship:
C=a2Ab+b2=a2(a1lg I490s-lg I700s+lgI700c-a1lgI490c-b1)+b2
Wherein, a1=0.549, b1=0.001, I700c、I490cFor definite value.
Preferably, measurement total phosphorus concentration C is respectively the total phosphorus concentration standard solution of 0.05,0.1,0.5,1.0,1.5mg/L
Transmitted light intensity values I at 700nm and 490nm wavelength700s、I490s, find out corresponding a1lgI490s-lgI700sValue, then with
a1lgI490s-lgI700sValue be abscissa, C is ordinate, is fitted to obtain the transmission of solution to be measured using least square method
The determining amount model of light intensity and total phosphorus concentration C: C=2.211lg I490s-4.028lgI700s+10.03
In the present embodiment, the solution to be measured is potassium dihydrogen phosphate.
It will be readily appreciated by those skilled in the art that the configuration side of above-mentioned turbidity standard solution and total phosphorus concentration standard solution
Method is is not limited in the present invention.
In order to examine the effect of determining amount model established by the present invention, turbidity standard solution and potassium dihydrogen phosphate are utilized
Solution is configured to the mixed solution of different turbidity and total phosphorus concentration, tests the total phosphorus concentration value after measuring determining amount and does not compensate
Total phosphorus concentration value and respective relative error.As shown in Fig. 3, the total phosphorus concentration value relative error after determining amount all exists
Within 5%, illustrate that determining amount model established by the present invention effectively reduces interference caused by solution turbidity detects total phosphorus,
So that the detected value of total phosphorus concentration is closer to true value.
It should be understood by those skilled in the art that foregoing description and the embodiment of the present invention shown in the drawings are only used as illustrating
And it is not intended to limit the present invention.The purpose of the present invention has been fully and effectively achieved.Function and structural principle of the invention exists
It shows and illustrates in embodiment, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (3)
1. being applied to the method for building up of the determining amount model of total phosphorus determination, which comprises the following steps:
(S1) the absorbance map of n different turbidity solution of limited quantity is measured respectively, and choosing is influenced maximum wave by turbidity
It is long to be used as compensation wavelength；
(S2) absorbance A of the solution of n different turbidity of limited quantity at compensation wavelength and 700nm wavelength is measured respectivelyCompensation
And A700, with ACompensationFor abscissa, A700For ordinate, linear fit is carried out using least square method and obtains A700With ACompensationBetween
Linear equation:
A700=a1ACompensation-b1；
(S3) absorbance at 700nm wavelength is compensated using the absorbance at compensation wavelength, is detected with eliminating turbidity to total phosphorus
Influence, obtain compensated absorbance:
Ab=A700-a1ACompensation-b1；
(S4) linear fit is carried out using least square method, establishes compensated absorbance AbIt is linearly closed with the unitary of total phosphorus concentration C
System:
C=a2Ab+b2。
2. the method for building up applied to the determining amount model of total phosphorus determination as described in claim 1, which is characterized in that in institute
It states in step (S1), measures 5,10,30,60, the turbidity standard solution absorbance map under 100NTU turbidity respectively, choose by turbid
Degree influences maximum 490nm wavelength as compensation wavelength；
In the step (S2), measure 5 respectively, 10,30,60, the turbidity standard solution under 100NTU turbidity is in 490nm wavelength
With the absorbance A at 700nm wavelength490And A700, with A490For abscissa, A700For ordinate, line is carried out using least square method
Property is fitted to obtain A700With A490Between linear equation:
A700=0.549A490-0.001；
In the step (S3), the absorbance at 700nm wavelength is compensated using the absorbance at 490nm wavelength, is mended
Absorbance after repaying:
Ab=A700-0.549A490- 0.001=A700-a1A490-b1=lg (I700c/I700s)-a1lg(I490c/I490s)-b1=a1lg
I490s-lg I700s+lgI700c-a1lgI490c-b1
Wherein, I700c、I490cThe respectively transmitted light intensity that is measured at 700nm, 490nm wavelength of pure water, in this, as reference light
By force, I700s、I490sTransmitted light intensity of the solution respectively to be measured at 700nm, 490nm wavelength；
In the step (S4), compensated absorbance A is establishedbWith the unary linear relation of total phosphorus concentration C:
C=a2Ab+b2=a2(a1lg I490s-lg I700s+lgI700c-a1lgI490c-b1)+b2
Wherein, a1=0.549, b1=0.001, I700c、I490cFor definite value, measure total phosphorus concentration C be respectively 0.05,0.1,0.5,
1.0, transmitted light intensity values I of the total phosphorus concentration standard solution of 1.5mg/L at 700nm and 490nm wavelength700s、I490s, find out pair
The a answered1lgI490s-lgI700sValue, then with a1lgI490s-lgI700sValue be abscissa, C is ordinate, utilize minimum two
Multiplication is fitted to obtain the determining amount model of the transmitted light intensity of solution to be measured and total phosphorus concentration C: C=2.211lg I490s-
4.028lgI700s+10.03。
3. the method for building up applied to the determining amount model of total phosphorus determination as claimed in claim 2, which is characterized in that described
Solution to be measured is potassium dihydrogen phosphate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110567899A (en) * | 2019-09-27 | 2019-12-13 | 长春理工大学 | A low temperature compensation method for COD detection |
| CN112098348A (en) * | 2020-08-20 | 2020-12-18 | 厦门斯坦道科学仪器股份有限公司 | Total phosphorus turbidity compensation method applied to high-turbidity water body online monitoring |
| CN112179858A (en) * | 2020-09-22 | 2021-01-05 | 杭州启绿科技有限公司 | Water quality detection method based on turbidity compensation technology |
| CN112461774A (en) * | 2020-11-20 | 2021-03-09 | 杭州绿洁环境科技股份有限公司 | Turbidity compensation method for total nitrogen analyzer |
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| CN114705653A (en) * | 2022-03-24 | 2022-07-05 | 浙江卓胜环境科技有限公司 | Total phosphorus online monitoring compensation method applicable to turbidity-containing sample |
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| CN110567899A (en) * | 2019-09-27 | 2019-12-13 | 长春理工大学 | A low temperature compensation method for COD detection |
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