Method for automatically and quickly digesting food sample

A food and sample technology, which is applied in the field of physical and chemical inspection of food hygiene, can solve the problems of many types of acid used, small amount of digested samples, and small environmental pollution, so as to improve economic and ecological benefits, use less types and amounts of reagents, and reduce The effect of the amount of nitric acid used

Active Publication Date: 2020-04-10
宁波市产品食品质量检验研究院(宁波市纤维检验所)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems, the present invention uses a fully automatic graphite digestion instrument, adopts the digestion tube to cover and reflow, and the bottom 1/4 to 1/2 of the digestion tube is located in the graphite hole to heat and digest, and develops a new automatic rapid digestion method. Realize automatic digestion, short digestion time, less reagent types and dosage, less environmental pollution, suitable for determination of various elements in food (including volatile mercury elements), overcome the shortcomings of current food sample digestion m

Method used

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  • Method for automatically and quickly digesting food sample
  • Method for automatically and quickly digesting food sample
  • Method for automatically and quickly digesting food sample

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for automatically and quickly digesting food samples, the specific steps are:

[0051] Sample weighing, weigh 0.5-2g of solid sample (accurate to 0.001g, increase the sampling amount to 5g for samples with more water content) or pipette 1.00-5.00mL of liquid sample into a polytetrafluoroethylene digestion tube, containing The ethanol sample is first heated on an electric heating plate at low temperature to remove ethanol;

[0052] 1. Place the PTFE digestion tube with the weighed sample in the automatic graphite digestion instrument and run the digestion program; when the digestion tube is placed in the automatic graphite digestion instrument, the bottom 1 / 4 to 1 / 2 of the digestion tube body is located Heating in graphite pores; 2.0-6.0mL of high-purity nitric acid added;

[0053] 2. After the instrument automatically finishes adding nitric acid, cover the lid of the digestion tube, and then heat up the sample for digestion. The digestion procedure is shown in...

Embodiment 2

[0059] Embodiment 2: analyze the accuracy test of GBW10049 (GSB-27) scallion component analysis reference material

[0060] Adopt the method of embodiment 1 to analyze GBW10049 (GSB-27) scallion component analysis standard substance, wherein, sample digestion: accurately weigh GBW10049 (GSB-27) scallion powder 1g (accurate to 0.001g), place in 50mL polytetrafluoroethylene Add 5.0 mL of high-purity nitric acid into the digestion tube, and perform digestion according to the above digestion method. After digestion, dilute to 50 mL with pure water. The clear liquid was taken and supplied to an inductively coupled plasma mass spectrometer for measurement, and the measurement results are shown in Table 3.

[0061] Table 3 Determination results of some elements in GBW10049 (GSB-27) scallions (n=3)

[0062]

Embodiment 3

[0063] Embodiment 3: the impact of different parameter conditions on the accuracy of the method

[0064] The method of Example 1 was used to analyze GBW10049 (GSB-27) scallion component analysis standard substance, the difference being that the parameter conditions of the digestion program were changed. See Table 4 for specific parameter condition settings, and Table 5 for the measurement results.

[0065] Table 4 Graphite digestion program

[0066]

[0067] By changing the digestion parameter conditions, it can be seen that in the process of heating and digesting samples with concentrated nitric acid, when the digestion solution is uniform and clear, most of the components in the sample are decomposed or transferred to the acid solution, but a small number of elements such as chromium need to be digested. It can only be transferred out under certain digestion conditions (temperature greater than 160°C, time greater than 20min, nitric acid usage greater than 4mL). After s...

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Abstract

The invention discloses a method for automatically and quickly digesting a food sample, and belongs to the technical field of physical and chemical inspection of food hygiene. According to the invention, a full-automatic graphite digestion instrument is adopted for digesting the food sample, a matched cover needs to cover a digestion tube in the digestion process, and 1/4-1/2 of the bottom of a digestion tube body is located in a graphite hole to be heated. The method overcomes defects of the existing food sample digestion methods, such as long time, easiness in pollution, inapplicability to determination of volatile elements such as arsenic, mercury, tin, selenium and the like of dry digestion, high consumption of acid, multiple types of acid, long digestion time, high blank value, high possibility of polluting the environment, inapplicability to determination of mercury and the like of wet digestion, and the risk of high-pressure tube explosion, small digestion sample amount, high labor intensity of tank screwing and cleaning and the like of microwave digestion.

Description

technical field [0001] The invention relates to a method for automatically and quickly digesting food samples, belonging to the technical field of food hygiene physical and chemical testing. Background technique [0002] Analysis and determination of elements in food, sample pretreatment is an important link. At present, the pretreatment method of the GB5009 series of "Food Sanitation Inspection Methods (Physical and Chemical Parts)" for the determination of elements in samples is mainly digestion treatment. Converted into easily decomposed inorganic compounds, so as to obtain a clear, transparent and concentrated solution without precipitation for detection and analysis. The digestion methods mainly include dry digestion, wet digestion, microwave digestion, etc., each of which has its own advantages and disadvantages: dry digestion The advantage is that no or less chemical reagents are used, and the operation is simple. The disadvantage is that the digestion time is long, ...

Claims

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Application Information

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IPC IPC(8): G01N1/44G01N27/62G01N27/626
CPCG01N1/44G01N27/62
Inventor 应璐邢家溧张少华张书芬郑睿行宿宇婷柯剑君石琳琳承海毛玲燕
Owner 宁波市产品食品质量检验研究院(宁波市纤维检验所)
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