Method for detecting trivalent chromium ions

A detection method, the technology of trivalent chromium, applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of simple detection, wide application value and low cost

Inactive Publication Date: 2012-06-20
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

However, there are few reports on the detection methods of trivalent chromium ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Cr in river water and lake water samples 3+ detection

[0027] (1) Prepare detection solution: get 5mmol / L tetrachloroalloy acid aqueous solution 10mL and join in the sodium polyphosphate solution of 100mL 1mmol / L, under the condition of stirring, add dropwise the sodium borohydride aqueous solution of 5mL1mmol / L, Stirring was continued at room temperature for 10 minutes to obtain a detection solution containing phosphate-modified gold nanoparticles.

[0028] (2) Collection of water samples to be tested: use sample collection bottles to collect water samples at a certain depth (20-50 cm) at three different locations in rivers and lakes, then adjust the pH with hydrochloric acid to make it acidic, so as not to affect the detection effect, and obtain Water samples to be tested.

[0029] (3) Take an appropriate amount from the detection solution containing phosphate-modified gold nanoparticles prepared in step (1) as a detection solution sample, and adjust its...

Embodiment 2

[0034] Example 2: Cr in industrial and mining, electrical appliances, and electroplating plant water samples 3+ detection

[0035] (1) Preparation of detection solution: take 10 mL of tetrachloroalloy acid aqueous solution of 5 mmol / L and add to 100 mL

[0036] In the 1mmol / L sodium polyphosphate solution, under stirring conditions, add 5mL 1mmol / L sodium borohydride aqueous solution dropwise, and keep stirring at room temperature for 10 minutes to obtain the phosphate-modified gold nanoparticle detection solution .

[0037] (2) Collection of water samples to be tested: collect water samples at intervals (such as 1h, 2h...) at the sampling position of the waste water discharge port, then mix them in equal amounts to form a mixed sample, and then adjust its pH with hydrochloric acid to make it It is acidic, so as not to affect the detection effect, and then reduced with enough sodium sulfite to make the Cr 6+ completely converted to Cr 3+ , to obtain the water sample to be ...

Embodiment 4

[0043] Embodiment 4: Cr in soil 3+ detection

[0044] (1) Prepare detection solution: get 5mmol / L tetrachloroalloy acid aqueous solution 10mL and join in the sodium polyphosphate solution of 100mL1mmol / L, under the condition of stirring, add dropwise the sodium borohydride aqueous solution of 5mL 1mmol / L, Stirring was continued at room temperature for 10 minutes to obtain a detection solution containing phosphate-modified gold nanoparticles.

[0045] (2) Collection of water samples to be tested: Do multi-point sampling at the same soil sampling site, then mix them evenly, add the mixed soil samples into ultrapure water, and settle still until the upper layer is transparent, then take the upper layer and mix The obtained supernatant was acidified, and finally reduced with enough sodium sulfite to make the Cr 6+ completely converted to Cr 3+ , to obtain the water sample to be tested.

[0046] (3) In the gold nanoparticle detection solution containing phosphate modification p...

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PUM

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Abstract

The invention discloses a method for detecting trivalent chromium ions in a water solution system. Based on complexation of gold nanoparticles modified by phosphate groups and the trivalent chromium ions, resonance absorption of surface plasmas of the gold nanoparticles is changed, and colors, ultraviolet-visible absorption strength and peak values of gold nanoparticle solution are changed, so that whether the solution system contains the trivalent chromium ions or not can be rapidly detected by directly observing change of the colors of the solution with naked eyes or testing change of the absorption strength and the peak values of the solution through an ultraviolet-visible spectrophotometer. The method has the advantages of simplicity and convenience in operation, low cost, high sensitivity, wide applicable range and the like. In addition, the method not only is applicable to detecting the trivalent chromium ions in the water solution system, but also can be used for rapidly detecting whether the water solution system contain total-chromium particles or not after indirectly reducing hexavalent chromium ions in the water solution system into the trivalent chromium ions.

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 trivalent 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 and mining, chemical, battery, electroplating and other industries, which contain a large amount of heavy metal ions in industrial waste water, which directly leads to the pollution of drinking water sources , the heavy metal ion pollution not only seriously threatens the health of people in polluted areas, but also has penetrated into every aspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/33G01N21/31
Inventor 辛军委吴爱国
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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