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OPA-NH4 <+> -SO3<2-> reaction-based sulfite ion spectroscopic measurement method and application

A technology of sulfite and determination method, which is applied in the direction of analysis through chemical reaction of materials, color/spectral characteristic measurement, etc., can solve problems such as high detection limit, human and environmental hazards, and unsuitability for wide use

Inactive Publication Date: 2015-12-09
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The pararosaniline hydrochloride method uses more mercury salts in the determination process, which has certain potential hazards to people and the environment, and is not suitable for widespread use; o-phenanthroline-Fe 3+ The minimum detection concentration of the method is 0.052mg / L, and the detection limit is relatively high, and there is nothing that can be done for samples with low sulfite ion content

Method used

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  • OPA-NH4 &lt;+&gt; -SO3&lt;2-&gt; reaction-based sulfite ion spectroscopic measurement method and application
  • OPA-NH4 &lt;+&gt; -SO3&lt;2-&gt; reaction-based sulfite ion spectroscopic measurement method and application
  • OPA-NH4 &lt;+&gt; -SO3&lt;2-&gt; reaction-based sulfite ion spectroscopic measurement method and application

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Embodiment Construction

[0066] An OPA-NH based 4 + -SO 3 2- The spectrometry method of the sulfite ion of reaction comprises the steps:

[0067] (1) Add 1.0mL of 10.6g / L o-phthalaldehyde solution to 25mL of sulfite ion standard solution in the range of 0.00-8.00mg / L, the concentration of EDTA is 52.0g / L and the concentration of NaOH is 12.0g 5.0mL of EDTA-NaOH buffer solution per L, 3.0mL of 5.0mmol / L ammonia nitrogen solution, that is, the dosage of OPA is 0.42g / L, the dosage of ammonia nitrogen is 0.60mmol / L, and the pH is 11.50; shake well; place at a certain temperature Lower the reaction to equilibrium; take it out and cool to room temperature, set the spectrophotometer to measure the wavelength as 550nm, and measure the absorbance A of the solution; take the sulfite ion concentration as the abscissa, and the absorbance A as the ordinate to draw a working curve;

[0068] (2) In 25mL sample solution, add 1.0mL10.6g / L o-phthalaldehyde solution, 5.0mL EDTA-NaOH buffer solution with EDTA concent...

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Abstract

The present invention discloses an OPA-NH4 <+> -SO3<2-> reaction-based sulfite ion spectroscopic measurement method which is as follows: an o-phthalaldehyde solution, an EDTA-NaOH buffer fluid and an ammonia nitrogen solution are successively added into a sulfite ion standard solution or a water sample, evenly shaken, placed at a certain temperature for reaction to equilibrium, and taken out and cooled to room temperature, spectrophotometer measuring wavelength is set for measuring solution absorbance A, the solution absorbance A is used as vertical coordinates, sulfite ion concentrations are used as x-coordinates for making a working curve; in a sample solution, sample solution absorbance As is measured according to the above method; and according to the working curve and the sample solution absorbance As, sulfite ion content in the sample solution can be quantified. The OPA-NH4 <+> -SO3<2-> reaction-based sulfite ion spectroscopic measurement method has the advantages of no need of use of toxic reagents, lower detection limits, higher sensitivity and the like.

Description

technical field [0001] The present invention relates to the mensuration of sulfite ion, be specifically related to a kind of based on OPA-NH 4 + -SO 3 2- Method for spectroscopic determination of reacted sulfite ion and its application. Background technique [0002] At present, the methods for detecting sulfite ion in water samples mainly include pararosaniline hydrochloride spectrophotometry and o-phenanthroline-Fe 3+ Spectrophotometry. The pararosaniline hydrochloride method uses more mercury salts in the determination process, which has certain potential hazards to people and the environment, and is not suitable for widespread use; o-phenanthroline-Fe 3+ The minimum detection concentration of the method is 0.052mg / L, and the detection limit is relatively high, and there is nothing that can be done for samples with low sulfite ion content. Contents of the invention [0003] The purpose of the present invention is to provide a kind of based on OPA-NH 4 + -SO 3 2...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/75
Inventor 梁英陈嫚伍婵翠
Owner GUILIN UNIV OF ELECTRONIC TECH
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