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Ultra-trace lead-cadmium ion detection method and detection test strip

A detection method and technology for cadmium ions, which are applied in the direction of analysis by chemical reaction of materials, material analysis by observing the influence on chemical indicators, etc., can solve the problems of low sensitivity, complicated devices, and cumbersome detection methods for lead and cadmium ions. and other problems, to achieve the effect of convenient use, simple judgment, and stable detection performance.

Inactive Publication Date: 2014-09-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an ultra-trace detection method and a detection test strip, the purpose of which is to amplify the color signal of dithizone through the silver staining reaction, thereby solving the current problem of lead and cadmium. The technical problems of cumbersome ion detection methods, complex devices, and low sensitivity

Method used

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  • Ultra-trace lead-cadmium ion detection method and detection test strip
  • Ultra-trace lead-cadmium ion detection method and detection test strip

Examples

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Embodiment 1

[0046] A detection test strip of an ultra-trace lead and cadmium ion detection method includes a base film and a dithizone layer, the dithizone layer is compounded on the base film, and the detection reagent strip is vacuum packaged. The base film is preferably a cellulose film.

[0047] The preparation process of the test strip of the ultra-trace lead-cadmium ion detection method is as follows:

[0048] First, prepare 0.002% dithizone-chloroform solution: weigh 0.002g dithizone and dissolve in 100mL chloroform solution, sonicate and mix well, because dithizone is easily decomposed by light, the prepared dithizone solution Store in a brown bottle.

[0049] Then, the 0.22μm cellulose acetate membrane was immersed in 0.002% dithizone-chloroform solution, and after standing for 20 minutes, the 0.22μm cellulose acetate membrane was taken out and washed twice with ultrapure water, stored in ultrapure water, sealed and stored .

[0050] Finally, the preliminarily prepared test strip is li...

Embodiment 2

[0052] Using the test strip in Example 1 to detect ultra-trace lead and cadmium ions includes the following steps:

[0053] (1) Acidification treatment of the sample to be tested: Add concentrated hydrochloric acid to the sample to be tested and adjust its pH to 1 to obtain an acidified sample.

[0054] The specific steps of acidification treatment of the sample to be tested are: take 100 mL of lake water, heat and evaporate to about 10 mL, pour it into a single-neck flask, slowly add 5 mL of concentrated hydrochloric acid, stir and heat to 93°C (no boiling). After 30 minutes, turn off the oil bath, lift the flask containing the water sample above the oil surface, open the stopper, cool to below 60°C, and slowly add 10 mL of 30% H 2 O 2 , Stir and heat to 93°C until no bubbles are generated. Then cool to below 60°C, add 5 mL of concentrated hydrochloric acid, stir and heat for 15 minutes, then concentrate by evaporation and filter.

[0055] (2) Remove Hg from the acidified sample ob...

Embodiment 3

[0069] Using the test strip in Example 1 to detect ultra-trace lead and cadmium ions includes the following steps:

[0070] (1) Acidification treatment of the sample to be tested: Add concentrated nitric acid to the sample to be tested and adjust its pH to 2 to obtain an acidified sample.

[0071] The specific steps of acidification treatment of the sample to be tested are: take 100 mL of lake water, heat and evaporate to about 10 mL, pour it into a single-neck flask, slowly add 5 mL of concentrated nitric acid, stir and heat to 93°C (no boiling). After 30 minutes, turn off the oil bath, lift the flask containing the water sample above the oil surface, open the stopper, cool to below 60°C, and slowly add 10 mL of 30% H 2 O 2 , Stir and heat to 93°C until no bubbles are generated. Then cool to below 60°C, add 5 mL of concentrated nitric acid, stir and heat for 15 minutes, then evaporate, concentrate and filter.

[0072] (2) Remove Hg from the acidified sample obtained in step (1) 2+ ...

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Abstract

The invention discloses an ultra-trace lead-cadmium ion detection method and a detection test strip. The detection method comprises the following steps: (1) acidifying a sample; (2) removing Hg2+ and Zn2+ in the sample; (3) diluting the sample by utilizing a buffer solution to obtain a neutral sample; (4) enabling the neutral sample obtained in the step (3) to be contacted with dithizone to generate a lead-cadmium ion-dithizone complex; (5) adding sulfide solution so as to enable the lead-cadmium ion-dithizone complex to be completely reacted to generate PbS and / or CdS; (6) carrying out silver staining reaction on the mixture containing PbS and / or CdS obtained in the step (5), and determining the concentration of lead and cadmium ions in the to-be-detected sample according to the grey scale of a reaction product. The test strip comprises a substrate film and a dithizone layer, wherein the dithizone layer is compounded onto the substrate film, and the test strip is packaged in a vacuum manner. The detection method and the detection test strip are sensitive inn detection, simple in judgment, capable of reaching the standard of naked eye detection, strong in applicability and stable inn performance.

Description

Technical field [0001] The invention belongs to the field of metal ion detection, and more specifically, relates to a detection method for ultra-trace lead and cadmium ions and a detection test strip. Background technique [0002] In recent years, with the rapid development of industries such as industry, agriculture, and processing industries, it has become an indisputable fact that heavy metal pollution in the environment has increased day by day. These heavy metal substances continue to accumulate in the food chain, posing a serious threat to the survival and health of various living organisms, including humans. [0003] At present, the commonly used heavy metal analysis methods mainly include colorimetry, ultraviolet spectrophotometry, electrochemical method, atomic emission spectrometry, atomic absorption spectrometry, atomic fluorescence spectrometry, inductively coupled plasma mass spectrometry, etc. These methods are used in the environment The monitoring of heavy metals p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 赵元弟刘会萍王春媛
Owner HUAZHONG UNIV OF SCI & TECH
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