CN110186987A - A kind of general 25 degree of translation methods of solution pH value - Google Patents
A kind of general 25 degree of translation methods of solution pH value Download PDFInfo
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Abstract
The invention discloses a kind of general 25 degree of translation methods of solution pH value, comprising the following steps: S1: acquisition PH electrode potential obtains the pH value (PHt) of solution；S2: acquisition solution temperature value (t)；S3: the temperature coefficient (α) of solution pH value, α=a* (PHt) ^2+b* (PHt)+c, a (- 0.02--+0.02), b (- 0.5--0.5), c (0-1) are calculated；S4: use formula: PH25=PHt/ (1+ α (t-25)) calculates conversion to 25 DEG C of pH value, PH25 is the pH value after temperature-compensating, PHt is the pH value measured under temperature t degree, and α is the temperature coefficient of solution pH value, solution temperature when t is measurement；S5: showing the pH value at a temperature of measurement, pH value and measurement temperature under fiducial temperature.Practicability of the present invention is good, can greatly improve the accuracy that PH is measured under environment temperature.
Description
Technical field
The present invention relates to electrochemical apparatus technical fields, more particularly to a kind of temperature-compensating side of general solution pH value
Method.
Background technique
Solution pH value is people's life, production process, very important parameter in environmental monitoring, we are frequently necessary to measure
The pH value of various water and solution, measurement pH value generally use glass electrode and reference electrode composition measuring cell, by PH meter measurement two
Potential difference Et between a electrode
Et=E0+Kt*pHt
PHt=(Et-E0)/Kt
In formula: Et is the electrode potential measured under temperature t degree
The electrode potential that E0 is solution pH value when being 7
Kt is the slope (conversion coefficient) of the electrode at a temperature of measurement
PHt is the negative logarithm of hydrogen ion activity in solution
Et in above formula is the electrode potential at a temperature of measurement, and instrument is according to the PH that the pH value that Et is obtained is at a temperature of measurement
Be worth (PHt), still, the pH value of solution be change with temperature, if will to the solution pH value measured under different temperatures into
Row compares or control, it is necessary to PHt value is converted to the pH value (PH25) at some acknowledged temperature (such as 25 DEG C), otherwise
Very big error can be brought.
It is well known that on the basis of the temperature-compensating of conductivity meter can convert the conductivity under observed temperature in laboratory
Conductivity value at 25 DEG C of temperature, the conductivity that this function measures same solution at different temperatures have comparable
Property, greatly facilitate laboratory data processing.
K25=Kt/ (1+ α (t-25))
In formula: Kt is the conductivity value measured under temperature t degree
α is the temperature coefficient of electrical conductivity of solution
Solution temperature when t is measurement
K25 is the conductivity value after temperature-compensating
But the relationship of the pH value of solution and temperature is more complex.When temperature increases, the pH value of some solution
The pH value for the solution slightly increase, having fall before increase again, the pH value of solution that has is basically unchanged, the pH value of solution that has is obvious
Decline, that is to say, that solution pH value temperature coefficient (α) is one from the unknown number for just counting to negative, therefore all the time both at home and abroad
The temperature compensation function of all PH meters only compensates for the influence that the variation of PH electrode " conversion coefficient (K) " measures meter,
Not influence of the compensation temperature to water sample pH value itself, therefore PH counts PH (t) value being only able to display under observed temperature.It is same molten
The pH value that liquid measures at different temperatures can not be compared, and must record pH value and measurement temperature simultaneously at work.To number
According to handling, compare, record, report and created great difficulties with Industry Control, and 25 DEG C of pH value conversions, being will be under Current Temperatures
PH value is converted to the pH value for assuming that other conditions are constant, when only temperature is 25 DEG C.As long as solution is not in temperature changing process
Chemical reaction or solute volatilization occurs.This function, which is presently considered to be, cannot achieve, at present it has been recognized that: because various
The composition of solution is different, and temperature coefficient is also different, therefore analyzer will be accomplished to convert to 25 DEG C the pH value of any solution
It is impossible.
Now all of laboratory pH table is all marked with automatic temperature compensation function, but these instrument only compensate for temperature
The influence to " slope " in meter measurement is spent, for compensation temperature to " water sample pH value " influence itself, this will not cause water sample pH
The biggish deviation of measured value.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of temperature-compensating sides of general solution pH value
Method.
The general 25 degree of translation methods of solution pH value of one kind proposed by the present invention, comprising the following steps:
S1: acquisition PH electrode potential obtains the pH value (PHt) of solution；
S2: acquisition solution temperature value (t)；
S3: the temperature coefficient (α) of solution pH value, α=a* (PHt) ^2+b* (PHt)+c are calculated；
S4: use formula: PH25=PHt/ (1+ α (t-25)) calculates conversion to 25 DEG C of pH value；
S5: showing the pH value at a temperature of measurement, pH value and measurement temperature under fiducial temperature.
Preferably, in the S3, a (- 0.02--+0.02), b (- 0.5-0.5), c (0-1).
Preferably, in the S4, PH25 is the pH value after temperature-compensating, and PHt is the pH value measured under temperature t degree, and α is molten
The temperature coefficient of liquid pH value, solution temperature when t is measurement.
Beneficial effects of the present invention: can develop " while showing the base of solution measurement temperature and the pH value under fiducial temperature
The systems such as pH value under quasi- PH meter " solution fiducial temperature controls in industrial PH, environmental protection, medical treatment, the energy, scientific research have great work
With.
25 DEG C of the temperature compensation function of pH meter and pH value convert this be two different concepts, common temperature-compensating function
It can be the slope being converted to slope that electrode obtains at a temperature of calibration by nernst equation under Current Temperatures, to be worked as
PH value (PHt) at preceding temperature, and 25 DEG C of conversions, are to be converted to and assume that other conditions are constant pH value under Current Temperatures, only
Be temperature be 25 DEG C when pH value (PH25), the PH that this function measures same solution at different temperatures has can
Than property, greatly facilitate laboratory data handle, compare, recording, reporting and industrial production and water treatment procedure in PH
Value control.
In industrial production and research work, be to solution pH value accuracy requirement it is very high, usual accuracy of measurement is wanted
It asks and reaches 0.01 to 0.001PH, when measurement temperature departure fiducial temperature (25 DEG C) is larger, if to reach higher measurement essence
Degree, it usually needs solution is heated or cooled to 25 DEG C, and this generally is difficult to accomplish, in Industry Control and environment monitoring then more
Add difficulty, has this fiducial temperature PH meter that can greatly improve the accuracy that PH is measured under environment temperature.
Practicability of the present invention is good, can greatly improve the accuracy that PH is measured under environment temperature.
Detailed description of the invention
Fig. 1 is the block diagram signal of the novel PH meter in the general 25 degree of translation methods of solution pH value of one kind proposed by the present invention
Figure；
Fig. 2 is the 0-50 degree pure water HCL HAC in a kind of general 25 degree of translation methods of solution pH value that invention proposes
NH4CL NaCL NaAC NH3.H2O NaOH pH value；
Fig. 3 is the 0-50 degree pure water HCL HAC in a kind of general 25 degree of translation methods of solution pH value that invention proposes
NH4CL NaCL NaAC NH3.H2O NaOH compensation effect；
Fig. 4 is the seawater PH temperature curve (inclination in a kind of general 25 degree of translation methods of solution pH value that invention proposes
Downwards) and compensation effect.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment
Referring to Fig.1, a kind of general 25 degree of translation methods of solution pH value are proposed in the present embodiment, comprising the following steps:
S1: acquisition PH electrode potential obtains the pH value (PHt) of solution；
S2: acquisition solution temperature value (t)；
S3: the temperature coefficient (α) of solution pH value, α=a* (PHt) ^2+b* (PHt)+c are calculated；
S4: use formula: PH25=PHt/ (1+ α (t-25)) calculates conversion to 25 DEG C of pH value；
S5: showing the pH value at a temperature of measurement, pH value and measurement temperature under fiducial temperature.
In the present embodiment, in S3, a (- 0.02--+0.02), b (- 0.5-0.5), c (0-1), in S4, PH25 is that temperature is mended
PH value after repaying, PHt are the pH value measured under temperature t degree, and α is the temperature coefficient of solution pH value, solution temperature when t is measurement
Degree.
Now by taking our common PH standard buffer solutions and other solution as an example:
Table is first is that pH value of the standard buffer solution at 0-50 DEG C, and the base that instrument is shown after overcompensation (25 DEG C of conversions)
PH value at quasi- temperature (25 DEG C), this benchmark PH meter will show this two numerical value simultaneously.
When the standard buffer solution that pH value is 12.36 when such as measuring 25 DEG C when 10 DEG C of environment temperature, instrument is shown:
PH value of one standard buffer solution of table at 0-50 DEG C
Standard buffer solution pH value after temperature-compensating (25 DEG C of conversions)
Table is second is that pH value of some aqueous solutions at 0-50 DEG C, and the benchmark that instrument is shown after overcompensation (25 DEG C of conversions)
PH value at temperature (25 DEG C).This benchmark PH meter will show this two numerical value simultaneously.
Instrument is shown when the sodium chloride solution that pH value is 7.03 when such as measuring 25 DEG C when 40 DEG C of environment temperature:
PH value of the table two aqueous solution at 0-50 DEG C
Standard buffer solution pH value after temperature-compensating (25 DEG C of conversions)
Referring to Fig. 2-4, it is demonstrated experimentally that " benchmark PH meter " be it is a kind of can be by various aqueous ph values conversion to 25 degree of pH values
PH meter, it is while showing PH (t) value under observed temperature, additionally it is possible to convert PH (t) for the PH at 25 DEG C of benchmark temperature
(25) value simultaneously shows that " benchmark PH meter " finishes the history that " solution pH value " can not compensate simultaneously.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of general 25 degree of translation methods of solution pH value, which comprises the following steps:
S1: acquisition PH electrode potential obtains the pH value (PHt) of solution；
S2: acquisition solution temperature value (t)；
S3: the temperature coefficient (α) of solution pH value, α=a* (PHt) ^2+b* (PHt)+c are calculated；
S4: use formula: PH25=PHt/ (1+ α (t-25)) calculates conversion to 25 DEG C of pH value；
S5: showing the pH value at a temperature of measurement, pH value and measurement temperature under fiducial temperature.
2. the general 25 degree of translation methods of solution pH value of one kind according to claim 1, which is characterized in that in the S3, a
(- 0.02--+0.02), b (- 0.5-0.5), c (0-1).
3. the general 25 degree of translation methods of solution pH value of one kind according to claim 1, which is characterized in that in the S4,
PH25 is the pH value after temperature-compensating, and PHt is the pH value measured under temperature t degree, and α is the temperature coefficient of solution pH value, and t is measurement
When solution temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110865105A (en) * | 2019-12-17 | 2020-03-06 | 中国科学院南京土壤研究所 | Method for obtaining soil pH value in-situ calibration curve and application |
| CN113109404A (en) * | 2021-03-15 | 2021-07-13 | 杭州融凯盛科技有限公司 | Method for detecting pH value of glue solution |
| CN113702445A (en) * | 2021-09-03 | 2021-11-26 | 杭州谱育科技发展有限公司 | PH value detection method and water quality analysis method |
| CN114894987A (en) * | 2022-04-07 | 2022-08-12 | 华能上海燃机发电有限责任公司 | Pure water medium pH temperature compensation test method and device |
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| CN114894987A (en) * | 2022-04-07 | 2022-08-12 | 华能上海燃机发电有限责任公司 | Pure water medium pH temperature compensation test method and device |
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Effective date of registration: 20230221 Address after: Floors 1-2, building 4, No. 1628, Lizheng Road, Lingang xinpian District, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200003 Patentee after: Shanghai Sanxin peirui Instrument Technology Co.,Ltd. Address before: 201715 room 2007, zone J, second floor, building 1, No. 15, Lane 588, zhangliantang Road, Liantang Town, Qingpu District, Shanghai Patentee before: SHANGHAI SAN-XIN INSTRUMENTATION Inc. |