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Colorimetric detection method of iodide ions

An iodide ion and colorimetric technology, applied in the field of iodide ion detection, can solve the problems of long reaction time and high detection limit, and achieve fast reaction speed, easy operation and good specificity

Inactive Publication Date: 2015-02-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can achieve semi-quantitative detection of iodide ion through color change, but there are disadvantages such as long reaction time, toxic auxiliary reagents or high detection limit to varying degrees.

Method used

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  • Colorimetric detection method of iodide ions
  • Colorimetric detection method of iodide ions

Examples

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Effect test

Embodiment 1

[0030]The detection effects of the gold-core-silver-shell nanoparticles and copper ions of the present invention to a series of concentration iodide ion solutions are given below. A series of concentrations of iodide ion solutions (0-400 μM) were prepared, and a mixed solution of gold-core-silver-shell nanoparticles and copper ions was added. After 15 minutes of reaction at room temperature, photographs were taken and UV-visible spectra were scanned. Figure 4 It shows that with the increase of iodide ion concentration, the color of the solution changes from yellow to red, and finally to purple, and the semi-quantitative detection of iodide ion concentration can be realized according to the color change. Figure 5 It shows that with the increase of iodide ion concentration, the absorbance value at 394 nm gradually decreases, and the change value of absorbance has a good linear relationship with the iodide ion concentration in the range of 0-80 μM ( Image 6 ), the linear corre...

Embodiment 2

[0032] The response time curves of the method of the present invention for detecting different concentrations of iodide ions are given below. Different concentrations of iodide ion solutions were prepared, and mixed solutions of gold core silver shell nanoparticles and copper ions were added respectively, and the relationship between the change value of absorbance at 394 nm and the reaction time was monitored by spectrophotometer at room temperature. Depend on Figure 7 As shown, when the gold-core-silver-shell nanosol is exposed to an iodide ion environment, the absorbance value at 394 nm decreases significantly within 1min, and tends to balance after 5min, indicating that the use of the gold-core-silver-shell nanoparticles of the present invention to detect iodide ions has a response The advantage of being fast.

Embodiment 3

[0034] The following is a comparison of the response effects of the gold-core-silver-shell nanoparticles and copper ions of the present invention to iodide ions and 17 other types of anions. Figure 8 It is shown that the response signal of the gold-core-silver-shell nanoparticles of the present invention to iodide ions is 9-154.5 times that of all other 17 anions, indicating that the method has high specificity to iodide ions.

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Abstract

The invention provides a colorimetric detection method of iodide ions and relates to iodide ion detection. The colorimetric detection method of the iodide ions comprises the following steps: dissolving HAuCl4 in water to prepare a HAuCl4 solution, and heating the HAuCl4 solution until boiling to obtain a solution A; dissolving sodium citrate in water and heating the solution until boiling to obtain a solution B; mixing the solution A with the solution B, heating the mixed solution so that the solution turns to wine red from light yellow, cooling until the temperature reaches a room temperature, thereby obtaining a gold nanoparticle solution, adding water to the gold nanoparticle solution and then orderly adding a silver-ammonia solution and formaldehyde to generate a reaction until the solution turns to yellow, thereby obtaining a gold-core and silver-shell nanoparticle solution; mixing the gold-core and silver-shell nanoparticle solution with a copper ion solution and applying to the mixed solution to the colorimetric detection of iodide ions. The colorimetric detection method of the iodide ions based on the gold-core and silver-shell nanoparticles and the copper ions as probes has the advantages of simplicity and convenience in operation, high reaction speed, high sensitivity, good specificity, fast semi-quantitative determination achievable by use of color change on the concentration of the iodide ions, and the like.

Description

technical field [0001] The invention relates to iodide ion detection, in particular to a method for colorimetric detection of iodide ions. Background technique [0002] Thyroid hormone plays a pivotal role in regulating cell metabolism, neuromuscular tissue development and growth (especially the brain development and growth of the fetus), and iodide is an essential trace element for thyroid hormone synthesis [Zimmermann, M.B. , 2011. Seminars in Cell & Developmental Biology 22, 645-652]. Either iodine deficiency or excess iodine can be extremely damaging to health. For example, iodine deficiency can lead to premature birth in pregnant women, increased fetal mortality, and mental retardation. Iodine excess can in turn cause hyperthyroidism [Zimmermann, M.B., Jooste, P.L., Pandaw, C.S., 2008. Lancet 372, 1251-1262; Pearce, E.N., 2012. Journal of Trace Elements in Medicine and Biology 26, 131-133]. Therefore, it is of great significance and urgency to establish an analytical...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/31G01N1/28
Inventor 曾景斌曹莹莹陈静静李敏李毅然袁存光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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