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Method and apparatus for measuring cadmium in food

A technology for food and ashing food, which is applied in the field of cadmium concentration and can solve the problems of complex determination method and long time consumption.

Inactive Publication Date: 2014-01-22
MEIDENSHA ELECTRIC MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the measurement method defined in the "Ministry Ordinance Limiting the Method of Measuring the Cadmium Amount Related to the Requirements Specified in Areas Taking Farmland Land Pollution Measures" is so complicated and takes a lot of time

Method used

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  • Method and apparatus for measuring cadmium in food
  • Method and apparatus for measuring cadmium in food
  • Method and apparatus for measuring cadmium in food

Examples

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Embodiment 1

[0085] Three types of standard brown rice samples each having a known concentration of cadmium were obtained from the National Institute for Environmental Studies. Their cadmium concentrations were 0.023 mg / kg, 0.32 mg / kg and 1.82 mg / kg, respectively.

[0086] The standard brown rice powder sample is an environmental standard sample prepared when measuring the amount of trace elements in rice for the purpose of evaluating the measured value and measuring the precision of the analytical method by using the sample. This standard sample consists of a series of three types of samples with different cadmium concentrations (low Cd level, medium Cd level and high Cd level). The brown rice powder standard is a standard related to element content and is defined as having guaranteed values ​​for 13 elements and reference values ​​for 9 elements.

[0087] In Example 1, the concentration of cadmium in brown rice was measured according to the measuring method according to the present inve...

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Abstract

The purpose is to measure the concentration of cadmium in a food with high accuracy in a simple manner. A food which is to be measured on the cadmium concentration is weighed precisely and pulverized. The pulverized sample is subjected to an ashing treatment by strong heating. The resultant sample is mixed with an acid and the mixed solution is shaken. A residue is removed from the mixed solution to produce a solution, and the solution is subjected to an electrochemical measurement. The method for the electrochemical measurement to be employed is an anodic stripping voltammetry or the like. The working electrode to be used in the electrochemical measurement is a copper electrode or the like. The temperature to be employed for the ashing treatment by strong heating is equal to or higher than the melting point of zinc and equal to or lower than the boiling point of cadmium, and the solution to be subjected to the measurement is adjusted to pH 3.5 to 5.5.

Description

technical field [0001] The present invention relates to a method and apparatus for measuring the concentration of cadmium in food by electrochemical measurement. Background technique [0002] Cadmium is widely distributed in nature including soil, water and air, so that cadmium from environmental sources is contained to some extent in most foods. In the past, in our country, there were extremely many cadmium-contaminated areas in mines, and epidemiological studies involving cadmium exposure had been started when Itai-itai came. [0003] The cadmium concentration in rice in our country tends to be higher compared to other countries, and also according to the General Food Survey (2005) in Japan the intake of cadmium from rice accounts for almost half of the total food, such as Figure 19 shown in. [0004] According to the Food Sanitation Law, the cadmium content in brown rice is regulated to be less than 1.0 ppm (less than 0.9 ppm for polished rice) from October 1970 and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/416
CPCG01N31/12G01N27/42G01N33/02
Inventor 福冈正芳久住美代子
Owner MEIDENSHA ELECTRIC MFG CO LTD
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