Method for detecting heavy metal content of food

A detection method and heavy metal technology, which is applied in the field of heavy metal detection, can solve the problems of difficult to accurately detect heavy metals and low detection results, and achieve the effect of accurate detection and reduced interference

Inactive Publication Date: 2018-12-14
肇庆市创业帮信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy metal residues in the system during the determination will inevitably lead to low detection results
At the same time, when the content of heavy metals in wastewater is low, the sensitivity of the instrument is difficult to accurately measure the concentration of heavy metals. It is necessary to test multiple sets of experiments to objectively show the concentration of heavy metals in wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for detecting heavy metal content in food, comprising the following steps:

[0026] (1) Freeze-dry the food at a temperature of -35°C and a pressure of 3 Pa for 20 hours, then place it in a muffle furnace and heat it to 500°C for ashing treatment for 2 hours, and pass through a 440-mesh sieve after ashing to obtain food powder;

[0027] (2) Add 25 mL of deionized water to 5 g of food powder and stir evenly, then add 5 mL of citric acid and disodium ethylenediamine tetraacetate in a weight ratio of 2:3, stir for 40 min, filter, and take the filtrate;

[0028] (3) Concentrate the filtrate with a rotary evaporator, then filter it with a 0.3um microporous membrane, then dilute it to 5mL with deionized water to obtain the test solution;

[0029] (4) After stirring 25mL of deionized water evenly, add 5mL of citric acid and disodium edetate with a weight ratio of 2:3, stir for 40min and then filter, concentrate the filtrate with a rotary evaporator, and then use 0.3um...

Embodiment 2

[0038] A method for detecting heavy metal content in food, comprising the following steps:

[0039] (1) Freeze-dry the food for 18 hours at a temperature of -25°C and a pressure of 5 Pa, then place it in a muffle furnace and heat it to 500°C for ashing treatment for 1 hour, and pass through a 500-mesh sieve after ashing to obtain food powder;

[0040] (2) Add 25 mL of deionized water to 5 g of food powder and stir evenly, then add 4 mL of citric acid and disodium ethylenediamine tetraacetate in a weight ratio of 2:3, stir for 35 min, filter, and take the filtrate;

[0041] (3) Concentrate the filtrate with a rotary evaporator, then filter it with a 0.5um microporous membrane, and then use deionized water to set the volume to 5mL to obtain the test solution;

[0042] (4) After stirring 25mL of deionized water evenly, add 4mL of citric acid and disodium edetate with a weight ratio of 2:3, stir for 35min and then filter, concentrate the filtrate with a rotary evaporator, and then...

Embodiment 3

[0051] A method for detecting heavy metal content in food, comprising the following steps:

[0052] (1) Freeze-dry the food at a temperature of -30°C and a pressure of 3 Pa for 24 hours, then place it in a muffle furnace and heat it to 600°C for ashing treatment for 2 hours, and pass through a 400-mesh sieve after ashing to obtain food powder;

[0053] (2) Add 25 mL of deionized water to 5 g of food powder and stir evenly, then add 3 mL of citric acid and disodium ethylenediamine tetraacetate in a weight ratio of 2:3, stir for 30 min, filter, and take the filtrate;

[0054] (3) Concentrate the filtrate with a rotary evaporator, then filter it with a 0.4um microporous membrane, then dilute it to 5mL with deionized water to obtain the test solution;

[0055] (4) After stirring 25mL of deionized water evenly, add 3mL of citric acid and disodium edetate with a weight ratio of 2:3, stir for 30min and then filter, concentrate the filtrate with a rotary evaporator, and then use 0.4um...

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Abstract

The invention belongs to the technical field of heavy metal detection and particularly relates to a method for detecting heavy metal content of food. The method comprises the following steps: freeze-drying a food sample, ashing, sieving, adding deionized water, citric acid and ethylene diamine tetraacetic acid, stirring, filtering, performing rotary evaporation concentration on the filtrate, determining the volume by using deionized water and detecting by a high performance liquid chromatographic instrument. To-be-detected liquid, which is obtained by a purification method of freeze-drying, ashing, adding the citric and the ethylene diamine tetraacetic acid and filtering, reduces the interference on the high performance liquid chromatographic instrument and can accurately detect the coppercontent, the lead content and the cadmium content of food.

Description

technical field [0001] The invention belongs to the technical field of heavy metal detection, and in particular relates to a method for detecting heavy metal content in food. Background technique [0002] Heavy metal refers to the atomic density greater than 5g / cm 3 There are about 45 kinds of metal elements, such as copper, lead, zinc, manganese, iron, nickel, vanadium, mercury, tungsten, aluminum, gold, silver and so on. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as lead and mercury are not necessary for life activities, and all heavy metals are toxic to the human body if they exceed a certain concentration. With the expansion of cities and the development of large-scale industries, the pollution of heavy metals in the atmosphere, soil and water environment is becoming more and more serious. Heavy metal pollution is one of the main problems of water pollution. Man-made pollution such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/14
CPCG01N30/02G01N30/06G01N30/14G01N2030/146
Inventor 贺士友刘海军
Owner 肇庆市创业帮信息技术有限公司
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