Food digestion method and detection method for simultaneously testing multiple inorganic elements in food

A detection method and technology of inorganic elements, applied in the field of analytical chemistry, can solve problems such as the loss of measured components and a large amount of foam, achieve good accuracy and precision, meet detection requirements, and improve detection efficiency.

Inactive Publication Date: 2019-01-08
福建省农业科学院农业质量标准与检测技术研究所
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  • Description
  • Claims
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Problems solved by technology

However, in the standard, copper, zinc, iron, and magnesium are digested by adding 10mL nitric acid and 0.5mL perchloric acid successively in proportion, and manganese and potassium are added after mixing nitric acid-perchloric acid (9:1), not all at once. Simultaneously digest copper, zinc, iron, magnesium, manganese, potassium and other elements in the sample
In addition, copper, zinc, iron, and magnesium in the standard are directly digested on an adjustable electric furnace after adding nitric acid and perchloric acid. If the content of organic matter in the sample is too high, a large amount of foam will easily be generated if the sample is directly digested, resulting in being Loss of measured components

Method used

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  • Food digestion method and detection method for simultaneously testing multiple inorganic elements in food
  • Food digestion method and detection method for simultaneously testing multiple inorganic elements in food
  • Food digestion method and detection method for simultaneously testing multiple inorganic elements in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Sample source: National standard materials, Sichuan rice GSB-22 (GBW10044), Hunan rice GSB-23 (GBW10045).

[0044] (1) Pretreatment

[0045] Accurately weigh 0.5 g (accurate to 0.001 g) of GSB-22 (GBW10044) and GSB-23 (GBW10045) standard rice samples and place them in a 50 mL borosilicate glass digestion tube, add 10 mL of the prepared acid mixture ( A nitric acid solution with a mass concentration of 65% and a mixed solution of perchloric acid with a mass concentration of 72% are prepared at a volume ratio of 4:1), covered and shaken gently, so that the sample is completely immersed in the acid solution. Stand for 10h to get the pre-digestion. The pre-digestion was digested on an adjustable digestion furnace, and the temperature was controlled: 120°C for 0.5h, 150°C for 0.5h, and 180°C for 2h to obtain a digest. Open the cover, drive off the white smoke, and drive the acid to 1mL at 200°C; take out the digestion tube, and after cooling, dilute to the 50mL mark with d...

Embodiment 2

[0055] Sample source: National standard material, cabbage GSB-5 (GBW10014), spinach GSB-6 (GBW10015).

[0056] (1) Pretreatment

[0057] Accurately weigh 1g (accurate to 0.001g) of GSB-5 (GBW10014) and GSB-6 (GBW10015) standard vegetable samples and place them in a 50mL high borosilicate glass digestion tube, add 15mL of the prepared acid mixture (mass The nitric acid solution with a concentration of 68% and the perchloric acid mixture with a mass concentration of 70% are prepared according to the volume ratio of 5:1), covered and shaken gently, so that the sample is completely immersed in the acid solution, and placed at 30°C 14h, put the obtained pre-digestion on an adjustable digestion furnace for digestion, temperature control: at 110°C for 1.0h, at 150°C for 0.5h, at 180°C for 2h; open the cover, drive white smoke, 200 Rinse the acid to 1.2mL at ℃, take out the digestion tube, cool the digestion solution to 30℃ naturally, then dilute to the 50mL mark with deionized water...

Embodiment 3

[0065] Sample sources: National standard materials, prawn GSB-28 (GBW10050), pig liver GSB-29 (GBW10051).

[0066] (1) Pretreatment

[0067] Accurately weigh 0.5g (accurate to 0.001g) of GSB-28 (GBW10050) standard prawn sample and GSB-29 (GBW10051) standard pig liver sample respectively and place them in a 50mL high borosilicate glass digestion tube, add 10mL respectively to prepare acid mixed solution (a nitric acid solution with a mass concentration of 67% and a perchloric acid mixed solution with a mass concentration of 71% are prepared in a volume ratio of 3:1), cover and shake gently to make the sample completely immersed in the acid solution , put it at 25°C for 12h to obtain the pre-digestion, put the pre-digestion on an adjustable digestion furnace for digestion, temperature control: at 120°C for 0.5h, at 160°C for 0.5h, at 180°C for 3h ;Open the cover, drive away the white smoke, and drive the acid to 1mL at 190°C; take out the digestion tube, cool it down to 25°C na...

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Abstract

The invention provides a food digestion method and a detection method for simultaneously testing multiple inorganic elements in foods and belongs to the field of analytical chemistry. The digestion method comprises the following steps: 1) mixing a nitric acid solution with a perchloric acid solution in a volume ratio of (3-5):1, and leaving to stand for 15-20 minutes at 20-30 DEG C so as to obtainan acid mixed solution; 2) mixing the acid mixed solution with a food to be digested, sealing the obtained mixture, and leaving to stand for 10-14 hours at 20-30 DEG C so as to obtain a pre-digestionsubstance; and 3) digesting the pre-digestion substance for 0.4-1.0 hour at 105-125 DEG C, for 0.4-1.0 hour at 135-160 DEG C and for 1.8-3 hours at 175-200 DEG C, thereby obtaining digestion liquids.After the food is digested by using the food digestion method provided by the invention, multiple inorganic elements in the food can be simultaneously tested with the obtained digestion liquids, theoperation is simple, and high accuracy and high precision can be achieved.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a food digestion method and a detection method for simultaneously measuring multiple inorganic elements in food. Background technique [0002] Inorganic elements (including trace elements) play an extremely important role in the normal development and life activities of the human body, and each element has its special physiological effects. The digestion of inorganic elements in food samples is crucial to the accuracy of the detection results of inorganic elements in food. Different digestion methods have different operational difficulties and different digestion effects. [0003] At present, the digestion method for detecting the content of inorganic elements in food is mainly based on the current national standards such as "GB5009.13-2017 National Food Safety Standard Determination of Copper in Food", "GB 5009.14-2017 National Food Safety Standard Deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N21/31
CPCG01N1/44G01N21/3103G01N2021/3114
Inventor 刘兰英吕新陈丽华黄薇涂杰峰上官亮
Owner 福建省农业科学院农业质量标准与检测技术研究所
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