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Method for detecting heavy metals in nutrition ground rice

A nutritional rice flour and detection method technology, applied in the field of food science, can solve the problems of inaccurate quantitative analysis of heavy metals, expensive instruments and equipment, and low detection sensitivity, so as to prevent concentrated sulfuric acid from splashing, improve detection sensitivity and accuracy, and improve detection sensitivity. high effect

Active Publication Date: 2017-07-21
广东一家人食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing detection of heavy metals, there is no method for directly detecting heavy metals in infant nutritional rice noodles, and in the traditional detection of heavy metals, either the detection equipment is expensive, or the detection method is harmful to heavy metals. The quantitative analysis is inaccurate, the detection sensitivity is low, and there are certain defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The detection method of heavy metal in a kind of nutritious rice flour that the present invention proposes, comprises the following steps:

[0020] S1: Take the sample to be tested, put it into the crucible, add nitric acid 0.3 times the amount of the sample to be tested, heat to evaporate to dryness, and add 0.25 times the amount of concentrated nitric acid at a rate of 5 drops / min after no steam is generated. Sulfuric acid, and use the method of temperature programming to process the sample to be tested in the crucible. The specific heating program is: the temperature is raised at a rate of 20°C / min for the 0th to 5th minute, and the temperature is raised at a rate of 20°C / min for the 5th to 10th minute. Raise the temperature at a rate of 10°C / min for the 10th to 25th minute, raise the temperature at a rate of 5°C / min for the 25th to 35th minute, and keep the temperature until the end of the treatment after the 35th minute;

[0021] S2: Put the processed sample into a...

Embodiment 2

[0026] A method for detecting heavy metals in nutritious rice noodles proposed by the present invention comprises the following steps: S1: Take the sample to be tested, add it to the crucible, add nitric acid of 0.5 times the amount of the sample to be tested, heat and evaporate to dryness, until no steam is produced Finally, add concentrated sulfuric acid 0.5 times the amount of the sample to be tested at a rate of 10 drops / min, and use the method of temperature programming to process the sample to be tested in the crucible. The temperature is raised at a rate of 1 min, the temperature is raised at a rate of 20°C / min for the 5th to 10th minute, the temperature is raised at a rate of 10°C / min for the 10th to 25th minute, and the temperature is raised at a rate of 3°C / min for the 25th to 35th minute. After the 35th minute, the temperature is maintained until end of processing;

[0027] S2: Put the processed sample into a high-temperature furnace for three ashings. The first ash...

Embodiment 3

[0032] The detection method of heavy metal in a kind of nutritious rice flour that the present invention proposes, comprises the following steps:

[0033] S1: Take the sample to be tested, put it into the crucible, add nitric acid 0.8 times the amount of the sample to be tested, heat to evaporate to dryness, and add 0.5 times the amount of concentrated nitric acid at a rate of 10 drops / min after no steam is generated. Sulfuric acid, and use the method of temperature programming to process the sample to be tested in the crucible. The specific heating program is: the temperature is raised at a rate of 20°C / min for the 0th to 5th minute, and the temperature is raised at a rate of 20°C / min for the 5th to 10th minute. Raise the temperature at a rate of 5°C / min for the 10th to 25th minute, raise the temperature at a rate of 5°C / min for the 25th to 35th minute, and keep the temperature until the end of the treatment after the 35th minute;

[0034]S2: Put the processed sample into a h...

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PUM

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Abstract

The invention discloses a method for detecting heavy metals in nutrition ground rice. The method comprises the following steps that 1, taking a to-be-tested sample, adding nitric acid for heating and teaming, and adding concentrated sulfuric acid for programming temperature increasing treatment; 2, performing ashing three times on the treated sample; 3, adding hydrochloric acid into the sample ashed in the step 2, performing sealing and soaking, then, adding a methyl alcohol-water mixed solution into the soaking solution, placing the solution into an ultrasonic apparatus for performing ultrasonic treatment, performing cooling to reach the room temperature, adjusting the pH to be neutral, transferring the solution into a volumetric flask and adopting the methyl alcohol-water mixed solution for the constant volume to obtain the treated to-be-tested sample; 4, adopting a high performance liquid chromatograph for detecting the treated to-be-tested sample, and calculating the content of heavy metals in the to-be-tested sample through the peak area. According to the heavy metals detection method, the detection flexibility is high, the repeatability is good, the detection accuracy is high, the apparatus and equipment are easy to use, low in detection cost and easy to obtain, and detection of various heavy metals can be performed at the same time.

Description

technical field [0001] The invention relates to the field of food science and technology, in particular to a method for detecting heavy metals in nutritious rice noodles. Background technique [0002] Heavy metals refer to atomic density greater than 5g / cm 3 There are about 45 kinds of metal elements, such as copper, lead, zinc, manganese, iron, diamond, nickel, vanadium, chromium, 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 advancement of industrialization, heavy metals widely exist in air, water, soil, cosmetics, food, and chemicals, especially the heavy metals in food will cause direct harm to the body. [0003] Nutritious rice flour is one of the preferred supplementary foods for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 唐玉乐
Owner 广东一家人食品有限公司
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