CN105738357A - CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis - Google Patents

CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis Download PDF

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CN105738357A
CN105738357A CN201610090734.2A CN201610090734A CN105738357A CN 105738357 A CN105738357 A CN 105738357A CN 201610090734 A CN201610090734 A CN 201610090734A CN 105738357 A CN105738357 A CN 105738357A
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sodium hydroxide
reaction liquid
chemical reaction
cie1976
colour space
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CN201610090734.2A
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CN105738357B (en
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王飞
张昂
崔宗岩
高飞
王海洋
葛娜
钱云开
刘晓茂
刘芳
邹明强
王宇曦
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王飞
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour

Abstract

The invention provides a CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis and belongs to the technical field of measurement. The CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis at least comprises the steps that a sodium hydroxide reagent with the concentration to be detected is continuously added into a reaction container where a solution with phenolphthalein indicator is added, the color space method is utilized for measuring color changes of the chemical reaction solution with the phenolphthalein indicator, and digital end point titration is carried out. By means of the method, the color of the chemical reaction solution with the phenolphthalein indicator is digitally measured, the test steps are simple, and automatic and batch large-scale detection can be achieved.

Description

The CIE1976L that chemical analysis configures with sodium hydroxide solution*a*b*Colour space method
Technical field
The present invention relates to the CIE1976 (L of a kind of chemical analysis sodium hydroxide solution configuration*a*b*) colour space collocation method, belong to field of measuring technique.
Background technology
In chemical analysis, the configuration of standard solution of sodium hydroxide is extremely important element task in chemical analysis, and the accuracy of its content determines the accurate of other testing result, is indispensable important step in titrimetry.
At present, collocation method both domestic and external is all artificial visual method, it is simply that according to the program of " visual impression → thinking judgement → language describes ", the instant color change of configuration process being described in words, the color representing terminal is understood by operator oneself.
Judging with phenolphthalein variable color for mark of its terminal.For reducing error, national standard is distinctly claimed employing everyone 4 parallel methods of 2 people's titration.
" visual impression → thinking judgement → language describes " method is very big by environment, people's sense organ and psychological impact, has bigger discreteness and random error, can not meet the needs that food is quickly checked.Color change as sensor, is adopted and is described in words by " visual impression → thinking judgement → language describes " method by human eye, and its major defect is:
1) human eye sensitivity to different colours, affects the judgement of titration end-point color, causes result deviation occur.
2) the physiological threshold difference of age and ethnic group, is difficult to grasp to some color distinction, even trained skilled person is also difficult;
3) between operator, the understanding of language is different, cause the disunity of titration end-point color.
4) collimation error between operator is with regard to the entirely possible deviation causing experimental result, and endpoint error is relatively large.
5) different titration environment are big to the visual impact of operator.
6) titration process and endpoint information can only be described with language, it does not have digital information, it is impossible to transmission of quantity value, and review difficulty.
7), when learning and teach, the aspectant mode of teaching of master and apprentice can only be taked to determine terminal colour.
8) labor intensity is big, be easily generated visual fatigue, affects the accurate of result.
9) affected by environment big, end reaction is blunt, it is difficult to improve accuracy of detection.
10) testing procedure is loaded down with trivial details, it is impossible to realize the detection scale of automatization, mass.
Summary of the invention
For overcoming the technical problem existed in prior art, the goal of the invention of the present invention is to provide the CIE1976 (L of a kind of chemical analysis sodium hydroxide solution configuration*a*b*) colour space method, its measurement result digitized, certainty of measurement is high, and testing procedure is simple, it may be achieved automatization, mass the detection of detection scale.
For realizing described goal of the invention, the present invention provides a kind of chemical analysis sodium hydroxide solution CIE1976 (L*a*b*) colour space collocation method, at least include adding in containing the reaction vessel of the solution of phenolphthalein indicator the sodium hydroxide reagent being continuously added concentration to be measured, it is characterized in that, utilizing colour space method to measure the change of the chemical reaction liquid color containing phenolphthalein indicator.
Preferably, after utilizing colour space method to measure n-th addition sodium hydroxide reagent, the brightness value of the chemical reaction liquid containing phenolphthalein indicatorRed green product exponential quantityChampac chromaticity exponential quantityValue of colorTone valueAnd calculate difference: ΔL * = L n * - L P * , Δa * = a n * - a P * , Δb * = b n * - b P * , ΔC * = C n * - C P * , ΔH * = H n * - H P * , ΔE * = ( L n * - L 1 * ) 2 + ( C n * - C 1 * ) 2 + ( H n * - H 1 * ) 2 , In formula The brightness value during titration end-point respectively preset, red green product exponential quantity, champac chromaticity exponential quantity, value of color, tone value and aberration, when one or more difference is when the scope set, the volume of the titer reagent that the volume of titer reagent now consumes when being exactly titration end-point.
Preferably, after utilizing colour space method to measure n-th addition sodium hydroxide reagent, the chemical reaction liquid containing phenolphthalein indicatorIncluding measuring process and calculation procedure, wherein,
Measuring process includes: measures reaction vessel within the scope of wavelength 380nm to wavelength 780nm with wavelength interval Δ λ and is contained within the absorbance of the chemical reaction liquid of phenolphthalein indicatorWherein, λ1More than or equal to 380nm, λkLess than or equal to 780nm, λi1+(i-1)Δλ;
Calculation procedure includes
S01: the absorbance being contained within the chemical reaction liquid of phenolphthalein indicator according to reaction vessel calculates the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm respectively
S02: go out to calculate the spectral transmittance { τ (λ of the chemical reaction liquid containing phenolphthalein indicator respectively according to the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm1) ..., τ (λi) ..., τ (λk), }:
S03: calculate the colour stimulus function of the chemical reaction liquid containing phenolphthalein indicator according to spectral transmittance respectively
S04: calculate the tristimulus values X of the chemical reaction liquid containing phenolphthalein indicator according to colour stimulus function respectivelyn、Yn、Zn
S05: calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein indicator according to the tristimulus values of the chemical reaction liquid containing phenolphthalein respectively*a*b*) colour space
S06: according toCalculateWith
Preferably, in step S01, calculate the absorbance of the chemical reaction liquid containing phenolphthalein indicator that light path is 10mm according to following formula:In formula: L is along the distance between optical propagation direction reaction vessel;
Preferably, in step S02, calculate the spectral transmittance of the chemical reaction liquid containing phenolphthalein indicator according to following formula: τ ( λ i ) = 10 - A 10 ( λ i ) .
Preferably, in step S03, calculate according to following formula
Colour stimulus function:In formula,Relative spectral power distributions factor for working flare.
Preferably, in step S04,Δ λ and
The respectively color matching function of CIE1964 standard colorimetric observer;κ0For normalization coefficient, κ 0 = 100 Σ i = 1 n S ( λ i ) y ‾ 0 ( λ i ) Δ λ .
Preferably, in step S05, calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein indicator respectively according to following equation*a*b*) colour space
L n * = 116 f ( Y n Y 0 ) - 16 , a n * = 500 [ f ( X n X 0 ) - f ( Y n Y 0 ) ] With b n * = 200 [ f ( Y n Y 0 ) - f ( Z n Z 0 ) ]
X0For the reference colour stimulus value 94.81 in CIE1964 standard colorimetric observer;Y0For the psychrometric colour specification 100.00 in CIE1964 standard colorimetric observer;Z0For the psychrometric colour specification 107.32 in CIE1964 standard colorimetric observer;
Preferably, in step S06, calculate C respectively according to following equationn *And Hn *:
C * n = ( a n * ) 2 + ( b n * ) 2 ; H n * = arctan ( b n * a n * ) .
Preferably, the CIE1976 (L of reaction end*a*b*) the chromatic value parameter of the colour space, brightness value L*It is 98.2 ± 5.0, red green product exponential quantity a*It is 2.5 ± 10.0, champac chromaticity exponential quantity b*For-1.7 ± 10.0, value of color C*For-1.7 ± 5.0, tone value h*For-0.6 ± 1.0, the aberration Δ E of starting point and reaction end is ± 5.
Compared with prior art, the CIE1976 (L of chemical analysis sodium hydroxide solution provided by the invention configuration*a*b*) colour space method, it is achieved that with sodium hydroxide solution configuration digitized measurement, testing procedure is simple, it may be achieved automatization, mass detection scale detection.
Accompanying drawing explanation
Fig. 1 is the CIE1976 (L of chemical analysis sodium hydroxide solution provided by the invention configuration*a*b*) composition frame chart of colour space system;
Fig. 2 is the CIE1976 (L of chemical analysis sodium hydroxide solution provided by the invention configuration*a*b*) index path of colour space system.
Detailed description of the invention
The present invention is described in detail below in conjunction with specific embodiment.
Fig. 1 is the composition frame chart of the CIE1976L*a*b* colour space system of chemical analysis sodium hydroxide solution provided by the invention configuration.As shown in Figure 1, the CIE1976L*a*b* colour space system of chemical analysis sodium hydroxide solution provided by the invention configuration includes constant light source 2, reaction unit 1, absorbance measuring device 5 and control system 6, wherein, described reaction unit includes reaction vessel 1, volumetric solution adding apparatus and agitator 7, sodium hydroxide titration liquid adding apparatus includes volumetric solution container 9 and piston pump 8, and described reaction vessel 1 includes the first optical lens group 3 and the second optical lens group 4 arranged on two relative chamber walls.Constant light source 2 is used for providing measurement illumination spectra, and the spectrum provided is within the scope of the visible ray continuous spectrum of 380nm~780nm.The preferred tungsten light source of the present invention is as constant light source, and it is full spectrum light source.First optical lens group 3 includes collimating lens 10 and parallel rays transmission sheet 11, the light of light source output sends collimating lens 10 to through fibre-optical splice 14, optical fiber 15 successively, and collimated steady lens 10 become directional light vertical irradiation to the light transmission sheet 11 being arranged on reaction vessel first all vertical light going direction in any direction.Be transmitted to the light transmission sheet 12 being arranged on reaction vessel second all vertical light going direction in any direction through the reactant liquor of the reacted container of light of directional light transmission sheet 11, second light transmission sheet is parallel and symmetrical with first light transmission sheet;Through parallel rays transmission sheet 12 light collimated 13 and after send spectrogrph to through optical fiber 16, fibre-optical splice 17.The distance of two light transmission sheets is between 1.0mm~100.0mm.
Fig. 2 is the index path of the CIE1976L*a*b* colour space system of chemical analysis sodium hydroxide solution provided by the invention configuration.As in figure 2 it is shown, the light path of CIE1976L*a*b* colour space system that chemical analysis configures with sodium hydroxide solution adopts spectrum-type light path, in Fig. 2, light is former 2, optical fiber 15, collimating lens 10 and directional light transmission sheet 11 form input path.Directional light transmission sheet 12, collimating lens 13 and light optical fiber 16 form emitting light path, full spectrum light source 2 flashlight is imported by optical fiber interface 14, irradiate after coquille collimating lens 10 standard and enter in solution by the light transmission sheet 11 of reaction vessel first all vertical light going direction in any direction, after being transmitted through solution by the flashlight after absorption portion optical signal in the solution, penetrate through the light transmission sheet 12 of second all vertical light going direction in any direction, import in spectrogrph by optical fiber 16 and optical fiber interface 17 then through after coquille collimating lens 13.Spectrogrph includes entrance slit 18, collimating mirror 19, grating 20, focus lamp 22 and CCD display detector 21, the light imported by optical fiber interface 17 entrance slit 18 successively is irradiated to collimating mirror 19 collimation and obtains collimated signal number, then this collimated signal optical dispersion of 20, grating, the flashlight defocused via the poly-mirror 22 of coquille is projected onto on one-dimensional linear CCD array detector detector array 21, thus converting optical signals to the signal of telecommunication to be supplied to control system, and then detect the one group of wavelength 360nm~800nm pre-set, the absorbance of the wavelength of wavelength interval≤20nm.
Absorbance measuring device 5 is for will be converted to absorbance by the flashlight after solution and be supplied to control system.Reaction unit 1 includes: reaction vessel 1, sodium hydroxide titration liquid adding apparatus and agitator 7, and wherein, reaction vessel is used for holding reactant liquor to be tested, adds phenolphthalein indicator in reactant liquor to be tested.Volumetric solution adding apparatus includes volumetric solution container 9 and piston pump 8, also including three-way valve, wherein, the first port of three-way valve passes through pipeline connection in reaction vessel 1, second port is by pipeline connection in volumetric solution container 9, and the 3rd port passes through pipeline connection in piston pump 8.Volumetric solution adding apparatus is for providing volumetric solution in reaction vessel 1, and dosage is added control pump by reagent and determines;Controller system controls the duty of volumetric solution adding apparatus, agitator 7 according to the color change information of the offer of absorbance measuring device 5.
Controller system at least includes CPU, RAM, ROM, display, input equipment and outut device, and wherein ROM is for storing the chemical reaction liquid color measurement procedure containing phenolphthalein, and RAM is a working region of CPU, and display is used for showing result;Input equipment is used for inputting instruction;Outut device is used for exporting result.The described chemical reaction liquid colour measurement containing phenolphthalein is according to pre-conditioned and computing formula by absorbance signal, it is scaled CIELAB chromatic value parameter, and compare according to this parameter and preset value, according to the program that volumetric solution adding apparatus, agitating device are controlled by comparative result.
CIE1976 (the L that chemical analysis configures with sodium hydroxide solution*a*b*) colour space system light source adopt tungsten light source as constant light source, the light measuring light source arrives, through transmission from one meridian to another optical fiber, collimating lens 10, the light transmission sheet 11 being arranged on reaction vessel first all vertical light going direction in any direction, then enter the liquid in reaction vessel, light is irradiated by liquid selectively absorption portion, non-absorbent irradiation light is transmitted through the light transmission sheet 12 of second of reaction vessel all vertical light going direction in any direction, is finally gone out absorbance by absorbance measuring measurement device.Wavelength 380nm~780nm, wavelength interval 1nm~20nm, it is preferable that the light of 5nm by after reaction vessel, obtains the absorbance data corresponding to visible ray of one group of wavelength 380nm~780nm, wavelength interval 1nm~20nm on absorbance measuring device.
The CIE1976L*a*b* colour space method of chemical analysis sodium hydroxide solution provided by the invention configuration is for the configuration of standard solution of sodium hydroxide.Before configuration, with water, reaction vessel is full of, gets rid of bubble, light beam is adjusted parallel rays transmission sheet center, carries out the blank correction of colour assessment apparatus.Same reaction container with blank correction is placed in the light path of colour measurement system.Being added sodium hydroxide reagent by volumetric solution adding apparatus, wherein the addition speed of sodium hydroxide reagent is maintained at 0.1mL/min~50mL/min.Agitator makes reactant liquor to be tested and sodium hydroxide reagent quickly mix, and the change of the absorbance that the color change of mixed reactant liquor causes is by absorbance measuring measurement device, and then provides control system by measurement result converted electrical breath.The control system absorbance A according to one group of wavelength(λ), calculate CIELAB colorimetric parameter;Control system compares with the parameter preset according to the colorimetric parameter calculated, if having reached the titration colourity preset, then titration terminates, and otherwise continuously adds sodium hydroxide reagent titration, until it reaches parameter preset terminates titration process.
Utilize the CIE1976 (L that chemical analysis sodium hydroxide solution provided by the invention configures*a*b*) colour space system before configuration, use water as blank reference solution and reaction vessel be full of, get rid of bubble, light beam is adjusted parallel glass sheet center, carries out the blank correction of absorbance measuring device.Then will reaction vessel be placed in absorbance measuring device, add W gram of Potassium Hydrogen Phthalate solution, add phenolphthalein indicator, and be continuously added with the molten reagent of sodium hydroxide of the concentration to be measured of preparation, utilize colour space method to measure the change of the chemical reaction liquid color containing phenolphthalein.After utilizing colour space method measurement n-th (n is the natural number more than or equal to 1) to add sodium hydroxide reagent, containing the brightness value of phenolphthalein indicator chemical reaction liquidRed green product exponential quantityChampac chromaticity exponential quantityValue of colorTone valueAnd calculate difference: ΔL * = L n * - L P * , Δa * = a n * - a P * , Δb * = b n * - b P * , ΔC * = C n * - C P * , ΔH * = H n * - H P * , ΔE * = ( L n * - L 1 * ) 2 + ( C n * - C 1 * ) 2 + ( H n * - H 1 * ) 2 , In formulaBrightness value 98.2 during the titration end-point respectively preset, red green product exponential quantity 2.5, champac chromaticity exponential quantity-1.7, value of color-1.7, tone value-0.6, when one or more difference is when the scope set, it is preferable that-5≤Δ L*≤+5 ,-10≤Δ a*≤+10 ,-10≤Δ b*≤+10 ,-5≤Δ C*≤+5 ,-1≤Δ H*≤+1 ,-5≤Δ E*≤+5, i.e. the brightness value L of reaction end*It is 98.2 ± 5.0, red green product exponential quantity a*It is 2.5 ± 10.0, champac chromaticity exponential quantity b*For-1.7 ± 10.0, value of color C*For-1.7 ± 5.0, tone value H*For-0.6 ± 1.0, the aberration Δ E of starting point and reaction end is ± 5, the volume of the standard solution of sodium hydroxide reagent that the volume of standard solution of sodium hydroxide reagent at this moment consumes when being exactly titration end-point, then use same reaction device, reaction unit adds the blank sample of equivalent, the sodium hydroxide utilizing same concentrations carries out titration, repeats said process, the standard solution of sodium hydroxide volume V consumed when measuring titration blank sample0;Blank solution is consumed after the volume of the volume of standard solution of sodium hydroxide and the standard solution of sodium hydroxide of Potassium Hydrogen Phthalate solution consumption is all corrected to the volume number at standard temperature 20 DEG C, calculate the concentration of standard solution of sodium hydroxide
In the present invention, sodium hydroxide reagent is prepared by following method: weigh 110g sodium hydroxide, is dissolved in 100mL without, in the water of carbon dioxide, shaking up, and injects in polyethylene can, and airtight placement is limpid to solution, and this solution is for configuring the stock solution of sodium hydroxide solution;Measure the supernatant 5.4ml of stock solution with plastic tube, be diluted to 1000mL with the water without carbon dioxide, shake up, for sodium hydroxide titrand.
Potassium Hydrogen Phthalate is prepared via a method which: by working standard reagent Potassium Hydrogen Phthalate in 105 DEG C~110 DEG C electric ovens, it is dried to constant weight, in precision more than the balance of 0.1mg weighs Potassium Hydrogen Phthalate 0.8038g, become Potassium Hydrogen Phthalate solution with 80ml without the water dissolution of carbon dioxide;
Phenolphthalein indicator is prepared via a method which: weigh 1g phenolphthalein indicator, dissolves with alcoholic solution (95%), dilute, is settled to 100ml
After utilizing colour space method to measure n-th addition sodium hydroxide reagent, phenolphthalein indicator Including measuring process and calculation procedure, wherein, measuring process includes:
The absorbance that wavelength 380 is contained within the chemical reaction liquid of phenolphthalein to reaction vessel in wavelength 780 scope is measured with wavelength interval Δ λWherein, λ1More than or equal to 380, λkLess than or equal to 780, λi1+(i-1)Δλ;
Calculation procedure includes:
S01: the absorbance including the reactant liquor of interior phenolphthalein indicator according to reaction vessel calculates the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm respectivelyIn this step, calculate the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm according to following formula:In formula: L is along the distance between optical propagation direction reaction vessel;
S02: go out to calculate the spectral transmittance { τ (λ of the chemical reaction liquid containing phenolphthalein respectively according to the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm1) ..., τ (λi) ..., τ (λk), in this step, calculate the spectral transmittance of the chemical reaction liquid containing phenolphthalein according to following formula:
S03: calculate the colour stimulus function of the chemical reaction liquid containing phenolphthalein according to spectral transmittance respectivelyIn this step, calculate colour stimulus function according to following formula:In formula,Relative spectral power distributions factor for working flare;
S04: calculate the tristimulus values X of the chemical reaction liquid containing phenolphthalein according to colour stimulus function respectivelyn、Yn、Zn, in this step,With
In formula,The respectively color matching function of CIE1964 standard colorimetric observer;κBFor normalization coefficient, κ 0 = 100 Σ i = 1 n S ( λ i ) y ‾ 0 ( λ i ) Δ λ ;
S05: calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein according to the tristimulus values of the chemical reaction liquid containing phenolphthalein respectively*a*b*) colour spaceIn this step, calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein respectively according to following equation*a*b*) colour space
L n * = 116 f ( Y n Y 0 ) - 16 , a n * = 500 [ f ( X n X 0 ) - f ( Y n Y 0 ) ] With
In formula, X0For the reference colour stimulus value 94.81 in CIE1964 standard colorimetric observer;Y0For the psychrometric colour specification 100.00 in CIE1964 standard colorimetric observer;Z0For the psychrometric colour specification 107.32 in CIE1964 standard colorimetric observer.CIE1976(L*a*b*) colour space method is CIE in 1976 (ComnissionInternationaledeI ' Eclairage, International Commission on Illumination) the international method recommended, and describes color, CIE1976 (L with set of number*a*b*) advantage of colour space method is that its parameter is only relevant with light source and object character.
When ( X n X 0 ) > ( 24 116 ) 3 Time (namely 0.008856451), f ( X n X 0 ) = ( X n X 0 ) 1 3
When ( X n X 0 ) ≤ ( 24 116 ) 3 Time (namely 0.008856451), f ( X n X 0 ) = 841 108 · X n X 0 + 16 116
When ( Y n Y 0 ) > ( 24 116 ) 3 Time (namely 0.008856451), f ( Y n Y 0 ) = ( Y n Y 0 ) 1 3
When ( Y n Y 0 ) ≤ ( 24 116 ) 3 Time (namely 0.008856451), f ( Y n Y 0 ) = 841 108 · Y n Y 0 + 16 116
When ( Z n Z n ) > ( 24 116 ) 3 Time (namely 0.008856451), f ( Z n Z n ) = ( Z n Z n ) 1 3
When ( Z n Z 0 ) ≤ ( 24 116 ) 3 Time (namely 0.008856451), f ( Z n Z 0 ) = 841 108 · Z n Z 0 + 16 116
S06: according to the chemical reaction liquid containing phenolphthaleinCalculateValue andIn this step, calculate C respectively according to following equationn *And Hn *:
C * n = ( a n * ) 2 + ( b n * ) 2 ; H n * = arctan ( b n * a n * ) .
Compared with prior art, the dynamic measurement method numerical value of the reactant liquor color utilizing sodium hydroxide reagent to carry out titration provided by the invention replaces traditional expression that color is used " visual impression → thinking judges → language description ", has an advantage in that:
1) the digitized representations method of standard solution of sodium hydroxide titration process and titration end-point is realized,
2) the color variation track in titration process can be restored accurately, it is achieved the digitized of color description;
3) corresponding relation of titration volumes and color change can be realized, lay the foundation data for unified titration end-point color;
4) avoid artificial color vision difference, improve analysis precision;
5) have recorded the titration end-point data that in configuration process, color represents;
6) magnitude tracing of titration process color and volume corresponding relation is achieved;
7) realize strange land, the transmission of long-range digitized measured value, eliminate communication barriers;
8) sample automatic sampling apparatus is coordinated, it may be achieved the detection work of full-automatic, mass;
9) change suitable in shades of colour, signal stabilization, can be applicable to the judgement of all colours indicator method titration end-point.
The above is only that embodiments of the present invention describe in detail; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and modification, these improve the protection domain that also should be regarded as invention with modification.

Claims (11)

1. a chemical analysis sodium hydroxide solution CIE1976 (L*a*b*) colour space collocation method, at least include adding in containing the reaction vessel of the solution of phenolphthalein indicator the sodium hydroxide reagent being continuously added concentration to be measured, it is characterized in that, utilizing colour space method to measure the change of the chemical reaction liquid color containing phenolphthalein indicator.
2. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 1 configuration*a*b*) colour space method, it is characterised in that after utilizing colour space method to measure n-th addition sodium hydroxide reagent, the brightness value of the chemical reaction liquid containing phenolphthalein indicatorRed green product exponential quantityChampac chromaticity exponential quantityValue of colorTone valueAnd calculate difference: In formulaThe brightness value during titration end-point respectively preset, red green product exponential quantity, champac chromaticity exponential quantity, value of color, tone value and aberration, when one or more difference is when the scope set, the volume of the titer reagent that the volume of titer reagent now consumes when being exactly titration end-point.
3. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 2 configuration*a*b*) colour space method, it is characterised in that after utilizing colour space method to measure n-th addition sodium hydroxide reagent, the chemical reaction liquid containing phenolphthalein indicatorIncluding measuring process and calculation procedure, wherein,
Measuring process includes: measure, with wavelength interval Δ λ, the absorbance that wavelength 380 is contained within the chemical reaction liquid of phenolphthalein indicator to reaction vessel in wavelength 780 scopeWherein, λ1More than or equal to 380, λkLess than or equal to 780, λi1+(i-1)Δλ;
Calculation procedure includes
S01: the absorbance being contained within the chemical reaction liquid of phenolphthalein indicator according to reaction vessel calculates the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm respectively
S02: go out to calculate the spectral transmittance { τ (λ of the chemical reaction liquid containing phenolphthalein indicator respectively according to the absorbance of the chemical reaction liquid containing phenolphthalein that light path is 10mm1) ..., τ (λi) ..., τ (λk), }:
S03: calculate the colour stimulus function of the chemical reaction liquid containing phenolphthalein indicator according to spectral transmittance respectively
S04: calculate the tristimulus values X of the chemical reaction liquid containing phenolphthalein indicator according to colour stimulus function respectivelyn、Yn、Zn
S05: calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein indicator according to the tristimulus values of the chemical reaction liquid containing phenolphthalein respectively*a*b*) colour space
S06: according toCalculateWith
4. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 3 configuration*a*b*) colour space method, it is characterised in that in step S01, calculate the absorbance of the chemical reaction liquid containing phenolphthalein indicator that light path is 10mm according to following formula:In formula: L is along the distance between optical propagation direction reaction vessel.
5. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 4 configuration*a*b*) colour space method, it is characterised in that in step S02, calculate the spectral transmittance of the chemical reaction liquid containing phenolphthalein indicator according to following formula:
6. CIE1976 (the L of profit chemical analysis sodium hydroxide solution configuration according to claim 5*a*b*) colour space method, it is characterised in that in step S03, calculate colour stimulus function according to following formula:In formula,Relative spectral power distributions factor for working flare.
7. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 6 configuration*a*b*) colour space method, it is characterised in that in step S04,With
The respectively color matching function of CIE1964 standard colorimetric observer;κ0For normalization coefficient,
8. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 7 configuration*a*b*) colour space method, it is characterised in that in step S05, calculate the CIE1976 (L of the chemical reaction liquid containing phenolphthalein indicator respectively according to following equation*a*b*) colour space
With
X0For the reference colour stimulus value 94.81 in CIE1964 standard colorimetric observer;Y0For the psychrometric colour specification 100.00 in CIE1964 standard colorimetric observer;Z0For the psychrometric colour specification 107.32 in CIE1964 standard colorimetric observer.
9. CIE1976 (the L of chemical analysis sodium hydroxide solution according to claim 8 configuration*a*b*) colour space, it is characterised in that in step S06, calculate C respectively according to following equationn *And Hn *
10. CIE1976 (the L according to the arbitrary described chemical analysis sodium hydroxide solution configuration of claim 1-9*a*b*) colour space method, it is characterised in that the chromatic value parameter of reaction end, brightness value L*It is 98.2 ± 5.0, red green product exponential quantity a*It is 2.5 ± 10.0, champac chromaticity exponential quantity b*For-1.7 ± 10.0, value of color C*For-1-7 ± 5.0, tone value h*For-0.6 ± 1.0, the aberration Δ E of starting point and reaction end is ± 5.
CN201610090734.2A 2016-02-07 2016-02-07 The CIE1976L that chemical analysis is prepared with sodium hydroxide solution*a*b*Colour space method CN105738357B (en)

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CN108918760A (en) * 2018-07-27 2018-11-30 王飞 Chemically react the a* value and substance magnitude relation calculation method of the CIELAB color space of spectrum

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