Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A detection method for cd2+

A detection method and detection liquid technology are applied in the field of fast, simple and sensitive detection of Cd2+ based on the on-site core-shell method, which can solve the problems of difficult implementation and complicated experimental steps, and achieves low sampling volume, high sensitivity and selectivity, and flexible design. Effect

Active Publication Date: 2015-08-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 of 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 0.2g of Dextran 70 in 100mL of ultrapure water, cool to room temperature after dissolving, add 5mL of 0.5mM chloroauric acid solution under stirring conditions, and continue to drop 2mL of 0.1 M sodium hydroxide solution, after reacting for 2h, the gold nanoparticle aqueous solution containing dextran 70 modification is obtained; Measure this gold nanoparticle aqueous solution in right amount as detection liquid sample, adjust it with the sodium hydroxide aqueous solution of 0.1mol / L pH to 9.20-10.20, as a tes...

Embodiment 2

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

[0041] (1) Collection of water samples to be tested: Collect water samples at intervals (such as 1h, 2h...) at the sampling position of the wastewater discharge outlet of the industrial and mining company, and then mix them in 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 of: basically as described in step (4) in Example 1, the 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 0...

Embodiment 3

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

[0046] (1) 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 Alkalinizing the obtained supernatant to obtain a water sample to be tested;

[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 of: basically as described in step (4) in Example 1, the 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+ Compared with the color of the aqueous solution, if the color...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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+ detection methods, especially 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, the harm of industrial "three wastes" (waste water, waste gas and waste residue) to the environment has become increasingly prominent. Large amounts of heavy metals flow into rivers, lakes and oceans along with wastewater, 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 environmental pollution, the detection of heavy metal ions in the environment is becoming more and more important. Especially the heavy metal cadmium (Cd), its main pollution source is the wastewater discharged from electroplating, mining, smelting, dyestuff, battery and chemical industries. Cadmium can irritate the respiratory tract, and lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com