Method for measuring content of trace cadmium in rice by utilizing flame atomic absorption spectrometry

A technology of flame atomic absorption and spectroscopy, which is applied in the field of determination of trace cadmium content in rice, can solve the problems of limited application range, low sensitivity and matrix interference, and achieve the effects of overcoming interference, improving test sensitivity, and fast heating

Inactive Publication Date: 2014-01-08
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when analyzing trace elements in complex samples with a matrix, its lower sensitivity and matrix int

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Determination recovery rate experiment of cadmium content in Northeast rice:

[0060] The sample was digested by microwave to obtain the sample solution:

[0061] Accurately weigh 0.485g rice sample and place it in a clean and dry 50mL polytetrafluoroethylene pressure digestion tank, add digestion solvent and soak overnight, wherein the digestion solvent is a mixed solvent of 65% nitric acid 1mL and 30% hydrogen peroxide 3mL , and prepare a blank solution at the same time, then cover and seal it and put it into a microwave digestion device to heat and digest according to the microwave digestion program. , heated at 200°C for 5 minutes. After the digestion procedure, take out the digestion vessel and cool it to room temperature, transfer the sample to a 50mL polytetrafluoroethylene beaker, place the beaker on an electric heating plate and heat at low temperature to catch the acid. When the sample evaporates to dryness, take Cool the lower beaker and transfer the test so...

Embodiment 2

[0073] The only difference from Example 1 is that during the pre-enrichment process of sample cloud point extraction, a non-ionic surfactant micellar solution is obtained, which is diluted with twice distilled water to a constant volume, shaken and then placed in a 40°C water bath Heat to cloud point temperature.

[0074] Other experimental conditions were the same as in Example 1, and 6 parallel sample solutions to be tested were prepared, and the content of cadmium in the 6 samples was calculated according to the linear regression equation, and the average value was taken. The measured cadmium element contents are: 47.8ug / Kg, 46.9ug / Kg, 48.3ug / Kg, 49.2ug / Kg, 48.5ug / Kg, 46.3ug / Kg, and the calculated average value is 47.83ug / Kg.

[0075] Recovery experiment:

[0076] In order to test the accuracy of the method, the recovery rate experiment was carried out, and this step was omitted in the actual sample analysis process.

[0077] Pipette 5.0mL of the sample solution to be tes...

Embodiment 3

[0082] The only difference from Example 1 is that during the pre-enrichment process of sample cloud point extraction, a non-ionic surfactant micellar solution is obtained, which is diluted with twice distilled water to a constant volume, shaken and then placed in a 40°C water bath Heat to cloud point temperature.

[0083] Other experimental conditions were the same as in Example 1, and 6 parallel sample solutions to be tested were prepared, and the content of cadmium in the 6 samples was calculated according to the linear regression equation, and the average value was taken. The measured cadmium element contents were: 49.3ug / Kg, 48.3ug / Kg, 50.9ug / Kg, 51.8ug / Kg, 52.3ug / Kg, 49.2ug / Kg, and the calculated average value was 50.30ug / Kg.

[0084] Recovery experiment:

[0085] In order to test the accuracy of the method, the recovery rate experiment was carried out, and this step was omitted in the actual sample analysis process.

[0086] Pipette 5.0mL of the sample solution to be t...

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PUM

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Abstract

The invention provides a method for measuring the content of trace cadmium in rice by utilizing a flame atomic absorption spectrometry. The method is characterized by comprising the following steps of preprocessing a rice sample by utilizing a microwave digestion manner in which a long-time soaking manner is combined with a step type heating manner, after the digestion, reacting cadmium ions with potassium iodide to generate CdI4<2->, reacting the CdI4<2-> with methyl green (MG) to generate a hydrophobic ionic association compound, extracting the hydrophobic ionic association compound into a micelle phase of a TritonX-114 nonionic surfactant, and measuring the cadmium content in the micelle phase by utilizing the flame atomic absorption spectrometry. The method solves the problems that the measurement of the trace cadmium by utilizing a traditional flame atomic absorption spectrometry is low in sensitivity and is easily interfered by matrixes and has the advantages of high precision and recovery rate, small relative standard deviation, accuracy, reliability, rapidness and convenience.

Description

technical field [0001] The invention relates to a method for measuring trace cadmium content in rice, in particular to a method for measuring trace cadmium content in rice by means of microwave digestion-cloud point extraction flame atomic absorption spectrometry. Background technique [0002] Cadmium is a toxic metal element with strong carcinogenicity and teratogenicity. After ingestion and absorption in the human body, it is excreted very slowly. The biological half-life of the human body is about 16 to 38 years. Cadmium accumulates in the kidneys and liver of the human body, causing Cumulative poisoning can cause bone pain, fractures, and even cancer. In recent years, due to environmental factors, a considerable part of cadmium enters the human body through grains and vegetables, such as rice and flour, among which the intake of cadmium in grains accounts for half of the total intake. The problem of cadmium in grains is becoming more and more popular nowadays Therefore,...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N1/44G01N1/40
Inventor 徐晓华刘晓庆
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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