Method for rapidly detecting iodate by surface enhanced Raman spectroscopy and application of method

A surface-enhanced Raman and iodate technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of time-consuming, inconvenient on-site detection, and cumbersome iodate detection methods.

Inactive Publication Date: 2013-11-27
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of the traditional iodate detection ...

Method used

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  • Method for rapidly detecting iodate by surface enhanced Raman spectroscopy and application of method
  • Method for rapidly detecting iodate by surface enhanced Raman spectroscopy and application of method
  • Method for rapidly detecting iodate by surface enhanced Raman spectroscopy and application of method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1SERS rapid detection of iodate in table salt

[0036] 1.1 Main instruments and reagents:

[0037] DeltaNu Inspector portable Raman instrument, electronic balance;

[0038] Standard solution of iodate root: Accurately weigh 0.0122g of potassium iodate dried in an oven for 24 hours, dissolve it with ultrapure water, transfer it to a 100mL volumetric flask, and dilute to the mark to prepare a concentration of 100mg L -1 Potassium iodate stock solution, stored at 4°C, diluted to the required concentration before use; hydroxylamine (0.02mol L -1 ) weighed 0.1389g hydroxylamine, dissolved in 100mL aqueous solution, mixed in a brown bottle, and stored at 4°C; p-nitroaniline (0.02mol L -1 ): Weigh 0.2762g p-nitroaniline, dissolve in 100mL hydrochloric acid solution (1mol L -1 ), mix well, store in a brown bottle at 4°C; naphthaleneethylenediamine hydrochloride (0.02mol L -1 ): Weigh 0.5183g of naphthaleneethylenediamine hydrochloride, dissolve it in 100mL of aqueou...

Embodiment 2

[0049] Example 2SERS rapid detection of iodate in bottled water

[0050] In this application, the main instruments and reagents used, the drawing of the standard curve and the determination of interfering ions are the same as in Example 1.

[0051] 2.1 Treatment of bottled water samples:

[0052] Measure a certain volume of bottled water to obtain a bottled water sample. Then use the barreled water sample to prepare a spiked concentration of 0.020mg L -1 spiked bottled water samples.

[0053] 2.2 Determination of bottled water samples:

[0054] Take 200 μL of bottled water samples and spiked bottled water samples, add 2 μL of hydroxylamine solution, mix well, add 2 μL of p-nitroaniline and 2 μL of naphthaleneethylenediamine hydrochloride, mix well, and let stand for 1 min. Take an equal volume of the above reaction solution and Au / SiO 2 In the sample tube, mix evenly, detect with DeltaNu Raman instrument, excitation wavelength: 785nm, scan time: 1s, read 1138cm -1 For th...

Embodiment 3

[0055] Example 3SERS rapid detection of iodate in seawater

[0056] In this application, the main instruments and reagents used, the drawing of the standard curve and the determination of interfering ions are the same as in Example 1.

[0057] 3.1 Treatment of seawater samples:

[0058] A certain volume of seawater is measured and filtered to obtain a seawater sample. Then use the seawater sample to prepare a spiked concentration of 0.020 mg L -1 spiked seawater samples.

[0059] 3.2 Determination of seawater samples:

[0060] Take 200 μL of seawater samples and spiked seawater samples, add 2 μL of hydroxylamine solution, mix well, add 2 μL of p-nitroaniline and 2 μL of naphthaleneethylenediamine hydrochloride, mix well, and let stand for 1 min. Take an equal volume of the above reaction solution and Au / SiO 2 In the sample tube, mix evenly, detect with DeltaNu Raman instrument, excitation wavelength: 785nm, scan time: 1s, read 1138cm -1 For the peak area at the Raman shi...

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Abstract

The invention relates to a method for rapidly detecting iodate by surface enhanced Raman spectroscopy and an application of the method. A Raman signal of the iodate is very weak, an SERS (Surface Enhanced Raman Scattering) signal of iodate is also weak, hydroxylamine is oxidated into nitrite by the iodate, coupling dye is generated from nitrite ions and a diazo-coupling reagent under an acidic or alkalescent condition, the SERS signal of the coupling dye is strong, and qualitative and quantitative detection of the iodate is indirectly carried out by measuring the dosage of the coupling dye through SERS. According to the method and the application thereof, Au/SiO2 is used as an SERS substrate material, the stability of particles is improved by means of a silicon dioxide shell, so that the result repeatability is better. The method is suitable for rapid detection of the iodate in complex samples, such as tablet salt, drinking water and environment water and has the advantages of simpleness and rapidness (about 2 minutes), suitability for field detection and benefits for popularization and use and the like.

Description

technical field [0001] The invention relates to a method for rapidly detecting iodate by surface-enhanced Raman spectroscopy, in particular to a method for rapidly detecting iodate by surface-enhanced Raman spectroscopy and its application, and is suitable for the determination of iodate in complex samples such as salt, drinking water and the environment. Background technique [0002] Iodine is an important trace element, and iodine deficiency is an important public health problem worldwide, especially in young children and pregnant women. The best way to solve this problem is to add iodate to table salt. Therefore, it is of great significance to study the content of iodate in iodized table salt to ensure the quality and quality control of table salt. [0003] There are many traditional detection methods for iodate. In recent years, the detection methods reported at home and abroad mainly include titration, gas chromatography, high performance liquid chromatography, ion chr...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 李攻科张凯歌胡玉玲田中群
Owner SUN YAT SEN UNIV
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