Method for detecting content of lead in tea leaves based on upconversion-gold nanometer-magnetic nanometer specific system

A magnetic nanometer and detection method technology, applied in measurement devices, biological tests, material inspection products, etc., can solve the problems of inability to meet the requirements of real-time rapid detection of lead content, expensive equipment and high detection costs, and achieve and specific detection, High detection accuracy and sensitivity, high sensitivity detection effect

Active Publication Date: 2019-09-27
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional detection methods, such as atomic absorption spectrometry, have expensive equipment, high detectio

Method used

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  • Method for detecting content of lead in tea leaves based on upconversion-gold nanometer-magnetic nanometer specific system
  • Method for detecting content of lead in tea leaves based on upconversion-gold nanometer-magnetic nanometer specific system
  • Method for detecting content of lead in tea leaves based on upconversion-gold nanometer-magnetic nanometer specific system

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Embodiment 1

[0043] The invention discloses a method for detecting lead content in tea based on an upconversion-gold nanometer-magnetic nanometer specific system. The specific steps are:

[0044] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.087g of yttrium chloride hexahydrate, 0.047g of ytterbium chloride hexahydrate, 0.005g of holmium chloride hexahydrate and 0.066g of gadolinium chloride hexahydrate, and ultrasonically dissolve them with 3mL of methanol 5min, transfer to a 250mL three-necked flask, add 4.5mL oleic acid and 10.5mL 1-octadecene; under the protection of argon, heat to 160°C for the first time, magnetically stir for 30min, cool to room temperature; Add 15mL of methanol solution containing 0.221g of ammonium fluoride and 0.45g of sodium hydroxide dropwise into the solution, then react in the first water bath at 50°C for 30min, and in the second water bath at 80°C for 40min, to completely volatilize the methanol in the solution; , under argon protect...

Embodiment 2

[0058] The invention discloses a method for detecting lead content in tea based on an upconversion-gold nanometer-magnetic nanometer specific system. The specific steps are:

[0059] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.087g of yttrium chloride hexahydrate, 0.047g of ytterbium chloride hexahydrate, 0.005g of holmium chloride hexahydrate and 0.066g of gadolinium chloride hexahydrate, and ultrasonically dissolve them with 3mL of methanol 10min, transfer to a 250mL three-necked flask, add 4.5mL oleic acid and 10.5mL 1-octadecene; under the protection of argon, heat to 150°C for the first time, magnetically stir for 30min, cool to room temperature; Add 15mL of methanol solution containing 0.221g of ammonium fluoride and 0.45g of sodium hydroxide dropwise into the solution, then react in the first water bath at 45°C for 30min, and then react in the second water bath at 85°C for 40min to completely volatilize the methanol in the solution; , under ar...

Embodiment 3

[0070] The invention discloses a method for detecting lead content in tea based on an upconversion-gold nanometer-magnetic nanometer specific system. The specific steps are:

[0071] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.087g of yttrium chloride hexahydrate, 0.047g of ytterbium chloride hexahydrate, 0.005g of holmium chloride hexahydrate and 0.066g of gadolinium chloride hexahydrate, and ultrasonically dissolve them with 3mL of methanol 8min, transfer to a 250mL three-necked flask, add 4.5mL oleic acid and 10.5mL 1-octadecene; under the protection of argon, heat to 170°C for the first time, magnetically stir for 30min, cool to room temperature; Add 15mL of methanol solution containing 0.221g of ammonium fluoride and 0.45g of sodium hydroxide dropwise into the solution, then react in the first water bath at 55°C for 30min, and in the second water bath at 75°C for 40min, to completely volatilize the methanol in the solution; , under the protectio...

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Abstract

The invention relates to a method for detecting the content of lead in tea leaves based on an upconversion-gold nanometer-magnetic nanometer specific system, and belongs to the technical field of food safety detection. The method comprises the following steps: firstly preparing and obtaining an upconversion nanometer material; adding ethyl alcohol, ammonia water, tetraethyl orthosilicate and 3-aminopropyltriethoxysilane to obtain an amino-functionalized upconversion nanometer material, and then preparing an adapter functionalized upconversion nanometer material; connecting a gold nanometer material and a magnetic nanometer material through an adapter complementary chain to obtain a gold nanometer-magnetic nanometer material solution, mixing with the adapter functionalized upconversion nanometer material solution to obtain a specific detection system, measuring fluorescence intensity signal characteristic values as vertical coordinates after a lead ion solution is added, establishing a lead content detection standard curve by taking lead ion concentrations as transverse coordinates so as to realize the measurement for the content of lead in tea leaves to be detected. According to the method, high-sensitivity specific detection of lead in tea leaves is realized by constructing a steady-state specific lead ion fluorescence detection system, and the method has the advantages of relatively wide linear detection range and relatively low detection limit and is good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a method for detecting lead content in tea based on an upconversion-gold nanometer-magnetic nanometer specific system. Background technique [0002] my country is a big tea-producing country, and tea is a traditional export agricultural product of our country. Strengthening the control of tea quality and safety is an important measure to ensure the safety of drinking tea, and it is also conducive to improving the competitiveness of tea products in the international market. With the rapid development of modern industry, water, air, and soil have been polluted by heavy metals to varying degrees. Tea trees can absorb heavy metals in the soil during their growth and development, resulting in excessive heavy metal content in tea leaves, such as cadmium, mercury, lead and other heavy metals. Lead and its compounds are highly toxic substances. Human contact, o...

Claims

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Application Information

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IPC IPC(8): G01N33/58G01N33/543G01N21/64
CPCG01N33/582G01N33/54346G01N33/54326G01N21/643G01N2021/6432G01N2021/6417
Inventor 欧阳琴陈全胜陈敏李欢欢郭志明
Owner JIANGSU UNIV
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