A detection method for mercury content in tea based on upconversion and rhodamine derivative specific system

A detection method and derivative technology, applied in the field of food safety detection, can solve the problems of long detection time, high detection cost, cumbersome detection steps, etc., and achieve the effects of wide linear detection range, high sensitivity detection, high detection accuracy and sensitivity

Active Publication Date: 2020-08-28
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the technical defects existing in the existing detection technology, such as: high detection cost, long detection time and cumbersome detection steps. Mercury content detection method, specifically by nano-controllable self-assembly to prepare fluorescent donors, construct a steady-state specific mercury ion detection system, eliminate background fluorescence, other ion interference and the influence of tea soup color, and achieve low-cost, low-cost mercury in tea. Highly sensitive and specific detection

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  • A detection method for mercury content in tea based on upconversion and rhodamine derivative specific system
  • A detection method for mercury content in tea based on upconversion and rhodamine derivative specific system
  • A detection method for mercury content in tea based on upconversion and rhodamine derivative specific system

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Embodiment 1

[0034] The invention discloses a method for detecting mercury content in tea based on an up-conversion and rhodamine derivative specific system. The specific steps are as follows:

[0035] 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 p...

Embodiment 2

[0045] The invention discloses a method for detecting mercury content in tea based on an up-conversion and rhodamine derivative specific system. The specific steps are as follows:

[0046] 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; , un...

Embodiment 3

[0054] The invention discloses a method for detecting mercury content in tea based on an up-conversion and rhodamine derivative specific system. The specific steps are as follows:

[0055] 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 to the solution, then react in the first water bath at 55°C for 30min, and then react in the second water bath at 75°C for 40min to completely volatilize the methanol in the solution; then, U...

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Abstract

The invention belongs to the technical field of food safety detection, and relates to a method for detecting mercury content in tea based on up-conversion and a Rhodamine derivative specific system. The specific method comprises the steps of: taking yttrium chloride hexahydrate, ytterbium chloride hexahydrate, holmium chloride hexahydrate, gadolinium chloride hexahydrate, oleic acid, 1-octadeceneand a methanol mixed liquid of ammonium fluoride and sodium hydroxide as raw materials to prepare an up-conversion nanomaterial; adding ethyl alcohol, aqueous ammonia, tetraethyl orthosilicate and 3-Aminopropyltriethoxysilane into the up-conversion nanomaterial to obtain an amino-functionalized up-conversion nanomaterial; mixing the amino-functionalized up-conversion nanomaterial with a Rhodaminederivative solution to obtain a specific detection system; and adding a mercury ion solution into the specific detection system to determine a fluorescence intensity signal eigenvalue of the detectionsolution, establishing a mercury ion detection standard curve by taking the fluorescence intensity signal eigenvalue as a longitudinal coordinate and mercury ion concentration as a horizontal ordinate, and realizing the determination of mercury content in tea to be detected. Through constructing the steady-state specific mercury ion fluorescence detection system, the method realizes the highly sensitive and specific detection of mercury in the tea, has a wide linear detection range and a low detection limit, and has good 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 mercury content in tea based on an up-conversion and rhodamine derivative 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. Mercury and its compounds are highly toxic substances. Human contact, ora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/01
CPCG01N21/01G01N21/643
Inventor 欧阳琴陈全胜陈敏李欢欢郭志明
Owner JIANGSU UNIV
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