An ultra-trace lead and cadmium ion detection method and detection test strip

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

Inactive Publication Date: 2017-04-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • An ultra-trace lead and cadmium ion detection method and detection test strip
  • An ultra-trace lead and cadmium ion detection method and detection test strip
  • An ultra-trace lead and cadmium ion detection method and detection test strip

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Embodiment 1

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

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

[0048] First, prepare 0.002% dithizone-chloroform solution: weigh 0.002g of dithizone and dissolve it in 100mL of chloroform solution, and mix it by ultrasonic vibration. Since dithizone is easily decomposed by light, the prepared dithizone solution Stored in a brown bottle.

[0049] Then, soak the 0.22 μm cellulose acetate membrane in 0.002% dithizone-chloroform solution, let it stand for 20 minutes, take out the 0.22 μm cellulose acetate membrane and rinse it twice with ultrapure water, store it in ultrapure water, and keep it sealed .

[0050] Finally, the prelimi...

Embodiment 2

[0052] Detect ultra-trace lead cadmium ions with the test strip in embodiment 1, comprise the following steps:

[0053] (1) Acidifying the sample to be tested: adding concentrated hydrochloric acid to the sample to be tested, adjusting its pH value to 1 to obtain an acidified sample.

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

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

Embodiment 3

[0069] Detect ultra-trace lead cadmium ions with the test strip in embodiment 1, comprise the following steps:

[0070] (1) Acidify the sample to be tested: add concentrated nitric acid to the sample to be tested, adjust its pH value to 2, and obtain an acidified sample.

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

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

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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 an ultra-trace lead and cadmium ion detection method and a detection test strip. Background technique [0002] In recent years, with the rapid development of industry, agriculture, processing and other industries, it has become an indisputable fact that heavy metal pollution in the environment has become increasingly serious. These heavy metals accumulate continuously 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. Heavy metal monitoring provides a strong guarantee. The colorimetric method does not r...

Claims

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Application Information

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Patent Type & Authority Patents(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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