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Method of ultrasensitive detection on cyanide in water body

A sensitive detection and cyanide technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of substandard detection sensitivity, other ion interference, and expensive equipment, and achieve easy popularization and application, fast and sensitive detection, and simple operation Effect

Active Publication Date: 2017-04-26
日照菁英传媒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for detecting cyanide that are relatively mature and commonly used at home and abroad include spectrometry, titration, voltammetry, electrochemical method, etc. Defects such as serious interference and the need for professional operating technicians

Method used

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  • Method of ultrasensitive detection on cyanide in water body
  • Method of ultrasensitive detection on cyanide in water body
  • Method of ultrasensitive detection on cyanide in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 Accuracy detection

[0046] Add different doses of cyanide ions to deionized water to make an aqueous solution of known cyanide ion concentration: C 0 -C 6 , where C 0 For blank control.

[0047] Configure the nano gold star detection substrate: take 3mL of 5mmol / L chloroauric acid aqueous solution and add 50mL of deionized water, then add 1mL of 0.1M CTAB, stir for ten minutes, add 50mM silver nitrate solution, stir for half an hour to make a gold seed solution. Take 5mL gold seed solution and quickly add 5mL 20mg / mL ascorbic acid solution, stir for 30 seconds and then age in the dark for 2 hours. Take the prepared nano-gold solution 10mL and add 100 μL 0.1mM papain solution, stir for half an hour, then quickly add 50 μL 40mM 4-mercaptobenzoic acid solution, and continue stirring for 10 minutes to obtain the nano-gold detection substrate.

[0048] Add 200 μL of the test solution with different cyanide ion concentrations to 800 μL of the detection subst...

Embodiment 2

[0055] Embodiment 2 specific detection

[0056] In the present embodiment, add other interfering ions (F - , Cl - ,Br - ,I - ,NO 3 - ,NO 2 - ,CO 3 2- ,SCN - ,S 2- , SO 4 2- ) (added in the form of salt, the total concentration of the added interfering substances is 10 μmol / L), then repeat the method used in Example 1 to measure the aqueous solution of known concentration.

[0057] result

[0058] The average value of the eight SERS values ​​measured is substituted into the corresponding marked curve (X-SERS intensity value) to obtain the content value of cyanide in each liquid to be tested (see Table 2).

[0059] Table 2

[0060]

[0061]

[0062] As can be seen from Table 2, the measured concentration obtained by the method of the present invention is very close to the known concentration of the liquid to be tested, and the recovery rate is between 86 and 103. Even at a very low concentration, the cyanide ion to be detected can still be achieved. Highly ...

Embodiment 3

[0064] The detection of cyanide ion in embodiment 3 river water, lake water sample

[0065] Collect water samples to be tested S3.1~S3.4: Collect water samples with sample collection bottles at the same depth at different locations in rivers and lakes, and place them for testing. Repeat the method used in Example 1 to measure aqueous solutions of known concentrations.

[0066] result

[0067] Take the average of the eight measured SERS values ​​and substitute them into the corresponding marked curve (X-SERS intensity value) to obtain the content value of cyanide in each liquid to be tested (see Table 3).

[0068] table 3

[0069]

[0070]

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Abstract

The invention relates to the field of cyanide detection, in particular to a method of ultrasensitive detection on cyanide based on a nanogold substrate SERS technology. The method comprises the following steps: (1) mixing cyanide solutions with different concentrations and aqueous solutions with different concentrations with a nanogold detection substrate respectively to obtain multiple groups of mixed solutions, determining an SERS strength value of each group of the mixed solution, and then drawing a standard curve graph of the cyanide concentrations and the SERS strength value; and (2) mixing the solution to be detected with the nanogold detection substrate to obtain a mixed solution to be detected, determining an SERS strength value of the mixed solution to be detected, and then obtaining the concentration value of the cyanide from the curve graph. The detection method has the advantages that is simple to operate and low in cost, can rapidly and sensitively detect the cyanide, can rapidly detect the cyanide with high specificity and high sensitivity below a lower limit of detection and can still efficiently detect the cyanide to be detected under the condition that the concentration of an interferent reaching up to tens times of the cyanide to be detected.

Description

technical field [0001] The invention relates to the field of detection of cyanide, in particular to a method for supersensitive detection of cyanide based on nano-gold substrate SERS technology. Background technique [0002] In recent years, the timely early warning and effective control of environmental pollution have become an extremely important part of the country's development. Due to the rapid development of modern industry, many cyanides enter natural water bodies through sewage discharged from electroplating, paint, dye, rubber and other industries, seriously endangering human health. Since 2009, there have been many cyanide poisoning incidents in my country, which have seriously affected the health of the people. In the new "Drinking Water Hygienic Standards", China has strictly limited the content of cyanide in daily drinking water, and issued the "Water Pollution Prevention and Control Action Plan" on April 2, 2015. Strong supervision of waste water, comprehensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 汪竹青王敏吴根华
Owner 日照菁英传媒科技有限公司
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