Multi-signal output method for measuring concentration of peroxymonosulfate
An output method and monosulfate technology, applied in the field of analysis and measurement, can solve the problems of single output signal and inaccurate measurement results, and achieve the effects of good anti-interference ability, speeding up detection speed and improving accuracy.
Pending Publication Date: 2022-07-08
YANGTZE NORMAL UNIVERSITY
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Problems solved by technology
[0004] For the above-mentioned deficiencies that exist in the prior art, the purpose of the present invention is to provide a kind of multi-signal output method of measuring the concentration of peroxymonosulfate, solve the fluorescent method of measuring PMS concentration in the prior art and need to use high-concentration environmental toxic substance Co 2+ And the problem that the output signal is single and the measurement result is not accurate enough
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Embodiment 1
[0039] 1) Draw a standard curve for the determination of PMS concentration in solution by fluorescence method:
[0040]Mix 0.01-0.15 mM TMB, 1-100 μM Co 2+ After fully mixing with 4 mL of acetic acid-sodium acetate buffer solution with pH 3.5-6.0, 20 μL of PMS standard solutions of different concentrations were added to the above mixed solution to obtain mixed solutions containing different PMS concentrations, and the final concentrations of PMS were respectively 0.00 μM, 0.23 μM, 0.33 μM, 0.65 μM, 1.30 μM, 1.95 μM, 2.60 μM, 3.25 μM, 9.76 μM, 16.27 μM, 22.77 μM, 32.53 μM, and 48.80 μM. 305 nm, the fluorescence intensity was measured at the emission wavelength of 404 nm, with the PMS concentration as the abscissa, the relative fluorescence intensity ( I 0 - I ) / I Draw a standard curve for the ordinate; where, I 0 is the fluorescence intensity of the sensing system when the PMS concentration is zero, I is the corresponding fluorescence intensity when the sensing system c...
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The invention discloses a multi-signal output method for determining the concentration of peroxymonosulfate, which is used for determining the concentration of PMS in an actual water sample by establishing a fluorescence method and a UV-Vis spectrophotometric method to determine a standard curve and a linear regression equation of the PMS. The principle is that peroxymonosulfate (PMS) is catalyzed by low-concentration cobalt ions to oxidize 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) to generate a chromogenic reaction, so that the absorbance of a sensing system at 654 nm is gradually increased along with the increase of the concentration of the PMS, and meanwhile, the fluorescence emission peak of the TMB at 404 nm is displaced and the intensity is changed. The concentration range of the PMS measured by the fluorescence spectrum is 0.23-48.80 mu M, and the detection limit is 0.03 mu M; and the concentration range of the PMS measured by the UV-vis spectrophotometric method is 0.98-130.13 [mu] M, and the detection limit is 0.11 [mu] M. Compared with the existing PMS determination method, the method has the following advantages: the method is simple and rapid, the concentration of the used cobalt ions is low, and the safe color developing agent TMB is colorless; and the multi-signal output enables the test result to be more accurate.
Description
technical field [0001] The invention belongs to the technical field of analysis and measurement, and in particular relates to a multi-signal output method for measuring the concentration of peroxymonosulfate. Background technique [0002] Peroxymonosulfate ions (PMS), as strong oxidants, are widely used in advanced oxidation processes (AOPs) to degrade organic pollutants in soil and water. Therefore, in the remediation process of PMS-based AOPs for the treatment of contaminated groundwater, wastewater and soil, the concentration of PMS is an important operating parameter for the degradation of organic pollutants, and it is necessary to monitor its changes at specified time intervals to evaluate the efficiency . In addition, PMS is also used in the fields of sulfide-induced corrosion in concrete sewers, organic synthesis, decontamination of proteinaceous pollutants, decontamination and disinfection of water, and in-situ chemical oxidation. Monitoring the PMS concentration c...
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IPC IPC(8): G01N21/64G01N21/33
CPCG01N21/643G01N21/33Y02A20/20
Inventor 曹海燕石文兵董文飞
Owner YANGTZE NORMAL UNIVERSITY