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Detection method for hexavalent chromium ions

A hexavalent chromium ion and detection method technology, which is applied in the field of chromium ion detection, can solve the problems of difficult uniform length and width of gold nanorods, low enrichment efficiency, and low measurement results, and achieve simple real-time detection and wide application value , Simple and convenient operation

Active Publication Date: 2012-06-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The common analysis method of hexavalent chromium that exists at present is diphenylcarbazide spectrophotometry, although this method has a lower detection concentration, but the accuracy is not high, because the composition of natural water is complex, water turbidity, Chromaticity, iron oxidizing and reducing substances in water all have serious interference on detection
If ferric hydroxide co-precipitation is used for separation and enrichment, the separation steps are cumbersome and the enrichment efficiency is low, which often leads to low measurement results
In addition, it has been reported that hexavalent chromium ions are used to etch gold nanorods, and the change of the ultraviolet-visible absorption peak of gold nanorods is used to detect hexavalent chromium in aqueous solution. Technically difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Cr in river water samples 6+ detection

[0032] (1) Preparation of detection solution:

[0033]Step 1: Add 1mL of 50mM sodium citrate solution and 1mL of 50mM silver nitrate solution into 98mL of ultrapure water, add 1mL of 0.1M sodium borohydride solution as a reducing agent under stirring conditions, and react for 2 hours to prepare an aqueous solution of citrate-modified silver nanoparticles;

[0034] Second step: under the condition of stirring, add the hydroxylamine hydrochloride solution of 5mL 62.5mM and the chloroauric acid solution of 5mL 5mM dropwise simultaneously in the silver nanoparticle aqueous solution that step (1) makes, can prepare after reacting 15 minutes An aqueous solution of silver-core gold-shell nanoparticles was obtained.

[0035] The third step: take 8mL of the aqueous solution of silver-core gold-shell nanoparticles prepared in step (2), centrifuge, then add 4mL of 0.1M cetyltrimethylammonium bromide (CTAB) as a surfactant to o...

Embodiment 2

[0042] Example 2: Cr in water samples from industrial and mining companies 6+ detection

[0043] (1) Preparation of detection solution:

[0044] Step 1: Add 1mL of 50mM potassium citrate solution and 1mL of 50mM silver nitrate solution into 98mL of ultrapure water, add 1mL of 0.1M potassium borohydride solution as reducing agent under stirring conditions, and react for 3 hours , to prepare citrate-modified silver nanoparticles.

[0045] Second step: under the condition of stirring, add the hydroxylamine hydrochloride solution of 5mL 62.5mM and the chloroauric acid solution of 5mL 5mM dropwise simultaneously in the silver nanoparticle aqueous solution that step (1) makes, can prepare after reacting 25 minutes An aqueous solution of silver-core gold-shell nanoparticles was obtained.

[0046] The third step: take 8mL of the aqueous solution of silver-core gold-shell nanoparticles prepared in step (2), centrifuge, then add 4mL of 0.1M cetyltrimethylammonium bromide (CTAB) as a ...

Embodiment 3

[0053] Embodiment 3: Cr in soil 6+ detection

[0054] (1) Preparation of detection solution:

[0055] Step 1: Add 1mL of 50mM citric acid solution and 1mL of 50mM silver nitrate solution into 98mL of ultrapure water, add 1mL of 0.1M sodium borohydride solution as a reducing agent under stirring conditions, and react for 4 hours. Silver nanoparticles modified with citrate were prepared.

[0056] Second step: under the condition of stirring, add the hydroxylamine hydrochloride solution of 5mL 62.5mM and the chloroauric acid solution of 5mL 5mM dropwise simultaneously in the silver nanoparticle aqueous solution that step (1) makes, can prepare after reacting 35 minutes An aqueous solution of silver-core gold-shell nanoparticles was obtained.

[0057] The third step: take 8mL of the aqueous solution of silver-core gold-shell nanoparticles prepared in step (2), centrifuge, then add 4mL of 0.1M cetyltrimethylammonium bromide (CTAB) as a surfactant to obtain The aqueous solution ...

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Abstract

The invention discloses a detection method for hexavalent chromium ions in an aqueous solution system. The detection method is based on the effect that the hexavalent chromium ions selectively etch Au core-Ag shell nanoparticles, resulting in the change of resonance absorption of plasmas on the surfaces of the Au core-Ag shell nanoparticles, then the color, ultraviolet visible absorption strength and the peak of the Au core-Ag shell nanoparticle solution are changed, so that whether the solution system contains the hexavalent chromium ions or not, and the content of the hexavalent chromium ions can be quickly detected through the visual inspection of color change of the solution and the change of absorption strength and peak tested by an ultraviolet visible light photometric and spectrum instrument. The detection method for hexavalent chromium ions has the advantages of simplicity and convenience in operation, low cost, high sensitivity and wide application range, and the like.

Description

technical field [0001] The invention relates to a detection technology of chromium ions, in particular to a detection method capable of quickly and simply identifying low-concentration hexavalent chromium ions in an aqueous solution with complex components. Background technique [0002] In recent years, drinking water sources in many places have been polluted, and pollution incidents of various heavy metal ions have occurred frequently, and people's health has been seriously violated. Among them, the industrial "three wastes" (waste water, waste gas, and waste residue) have caused great damage to the environment, such as industrial waste water from industries such as mining, chemical industry, battery, and electroplating, which contain a large amount of heavy metal ions. Among all kinds of heavy metals, chromium is a kind of toxic element that exists widely. The chromium slag accumulated in China alone exceeds 6 million tons, which seriously threatens people's health. When ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/33
Inventor 辛军委吴爱国
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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