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Detection method of Cd2+

A detection method and technology of detection liquid, which are applied in the preparation of test samples, measurement of color/spectral properties, and material analysis by observing the influence of chemical indicators, etc. The effect of high sensitivity and selectivity, small sampling volume, and simple detection method

Active Publication Date: 2013-02-27
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] In addition, there are reports in the literature on the detection of cadmium ions in aqueous solution by using cadmium ions to cause the aggregation of gold nanoparticles (Ying Xue, Hong Zhao, Analyst, 2011, DOI: 10.1039 / c1an15238f), but due to the use of buffer solutions and multi-step modification , making the experimental steps more complicated
[0005] In summary, there is an urgent need for rapid and timely on-site detection of cadmium ions, but due to various limitations, it is difficult to realize this technology in aqueous solution systems. Therefore, it is simple in design, easy to carry, high in sensitivity and strong in stability. , detection results with good reproducibility, and a low-cost cadmium ion detection method is imperative

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Cd in water samples 2+ detection

[0034] (1) Configure different concentrations of Cd 2+ Aqueous solution: different amounts of Cd 2+ Add to ultrapure water to prepare various known Cd 2+ Concentration aqueous solution, such as 0M, 5×10 -3 M. 1×10 -3 M. 5×10 -4 M. 1×10 -4 M. 5×10 -5 M. 1×10 -5 M. 5×10 -6 M. 1×10 -6 M. 5×10 -7 M. 1×10 -7 M. 5×10 -8 M. 1×10 -8 M et al.

[0035] (2) Preparation of detection solution: Heat and dissolve 0.2 g of dextran 70 in 100 mL of ultrapure water, cool down to room temperature after dissolving, add 5 mL of 0.5 mM chloroauric acid solution under stirring conditions, and continue to add 2 mL of 0.1 M sodium hydroxide solution, reacted for 2h to prepare gold nanoparticle aqueous solution containing dextran 70 modification; measure an appropriate amount of this gold nanoparticle aqueous solution as the detection liquid sample, and adjust its pH to 9.20~10.20, as a test solution for backup;

[0036] (3) Naked eye...

Embodiment 2

[0040] Example 2: Cd in water samples of industrial and mining companies 2+ detection

[0041] (1) Collection of water samples to be tested: collect water samples at regular intervals (such as 1h, 2h...) at the sampling location of the wastewater discharge outlet of the industrial and mining company, then mix equal amounts to form a mixed sample, and then adjust its pH with sodium hydroxide Make it alkaline, so as not to affect the detection effect, and obtain the water sample to be tested;

[0042] (2) Preparation of detection solution: as described in step (2) in Example 1;

[0043] (3) Naked eye colorimetric standard series: as described in step (3) in Example 1;

[0044] (4) Cd in the water sample to be tested 2+ Detection: basically as described in step (4) in Example 1, a mixed solution containing the water sample to be tested is obtained in about 15 minutes, and the color of the mixed solution containing the water sample to be tested is compared with the 0M concentra...

Embodiment 3

[0045] Example 3: Cd in soil 2+ detection

[0046] (1) Collection of water samples to be tested: Do multiple samplings at the same soil sampling site, then mix them evenly, add the mixed soil samples to ultrapure water, and settle until the upper liquid is transparent. The obtained upper layer liquid is alkalized to obtain the water sample to be detected;

[0047] (2) Preparation of detection solution: as described in step (2) in Example 1;

[0048] (3) Naked eye colorimetric standard series: as described in step (3) in Example 1;

[0049] (4) Cd in soil water samples 2+ Detection: basically as described in step (4) in Example 1, a mixed solution containing the water sample to be tested is obtained in about 20 minutes, and the color of the mixed solution containing the water sample to be tested is compared with the 0M concentration Cd in the colorimetric standard series. 2+ The color of the aqueous solution is compared, and the color does not change, indicating that the Cd...

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Abstract

The invention provides a detection method of Cd2+. The method comprises: reacting a water-soluble carbohydrate polymer aqueous solution having reducibility with a gold or silver salt solution to get an aqueous solution containing carbohydrate polymer-modified gold or silver nanoparticles, adsorbing Cd2+ on surfaces of the gold or silver nanoparticles through electrostatic adsorption, then adding a sulfhydryl compound to interact with Cd2+, and forming a layer of cadmium complexes on the surface of gold or silver nanoparticles to result in that the surface plasmon resonance absorption intensity and peak position of the gold or silver nanoparticles change, and the color and UV-visible absorption intensity of the gold or silver nanoparticle solution change. Therefore, naked eyes or a UV-visible spectrophotometer can be directly used for quick detection whether a solution contains Cd2+, fast and simple colorimetric detection for Cd2+ in a solution is realized, and the method is applicable to water quality survey of lakes and rivers, sewage testing, and detection of Cd2+ in food, blood and urine.

Description

technical field [0001] The present invention relates to Cd 2+ The detection method, in particular, relates to a simple, rapid and sensitive detection of Cd based on an on-site core-shell method 2+ Methods. Background technique [0002] With the rapid development of industry, industrial "three wastes" (wastewater, waste gas, waste residue) are increasingly harmful to the environment. Large amounts of heavy metals accompany wastewater into rivers, lakes and oceans, causing pollution. Heavy metal pollution has become one of the main problems of environmental pollution in my country. As people pay more and more attention to the problem of environmental pollution, the detection of heavy metal ions in the environment is becoming increasingly important. Especially the heavy metal cadmium (Cd), its main pollution source is the wastewater discharged from electroplating, mining, smelting, dyes, batteries and chemical industries. Cadmium will irritate the respiratory tract, and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/33G01N1/38
Inventor 吴爱国苗利静沈折玉曾乐勇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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