Method for detecting content of heavy metals in plant sample

A technique for heavy metals and samples, applied in the field of analytical chemistry

Inactive Publication Date: 2015-03-25
ANHUI AGRICULTURAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of sample pretreatment method especially the sample pretreatment method in the heavy metal content in the measurement vegetable sample that is used for flame atomic absorption spectrometry to measure heavy metal content in plant sample, to overcome above technical problem

Method used

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  • Method for detecting content of heavy metals in plant sample
  • Method for detecting content of heavy metals in plant sample

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The pretreatment of embodiment 1 vegetable sample

[0031] Chemical reagents:

[0032] Potassium dichromate (spectrum pure, purchased from Beijing Chemical Plant);

[0033] Manganese sulfate (analytically pure, purchased from Beijing Chemical Plant);

[0034] Zinc sulfate (analytically pure, purchased from Beijing Chemical Plant);

[0035] Cadmium sulfate (analytically pure, purchased from Beijing Chemical Plant);

[0036] Copper sulfate (analytically pure, purchased from Beijing Chemical Plant);

[0037] Concentrated hydrochloric acid (analytically pure, purchased from Beijing Chemical Plant);

[0038] Concentrated nitric acid (analytically pure, purchased from Beijing Chemical Plant);

[0039] Perchloric acid (excellent grade, purchased from Beijing Chemical Plant).

[0040] Vegetable samples:

[0041] Fresh Chinese cabbage (non-heading Chinese cabbage, the young plant of Brassica chinensis L.), was purchased randomly from Erli Street Vegetable Market in Hefei. ...

Embodiment 2

[0059] Embodiment 2: Atomic absorption spectroscopic analysis of vegetable samples

[0060] The atomic absorption spectrophotometer used is American Thermo Elenent SOLAAR M5 type.

[0061] Treat the sample with an atomic absorption spectrometer, flame type: air-acetylene, and the conditions are as follows

[0062] Table 1: Element instrument measurement conditions

[0063]

[0064] Prepare Cu, Zn, and Cd 1000 μg / mL standard stock solutions respectively.

[0065] Standard solution preparation is carried out according to the following method:

[0066] (1) Cu Weigh 0.5000g of metal Cu (high purity) and dissolve it in a small amount of nitric acid, evaporate to dryness on a water bath, add 5ml hydrochloric acid and evaporate to dryness, dissolve and dilute to 500ml with 1mol / L hydrochloric acid, then 1000mg / L Cu standard stock solution.

[0067] (2) Zn: Weigh 0.5000g of metal Zn(AR), dilute it to 500ml with a small amount of 6N hydrochloric acid, and obtain a 1000mg / L sta...

Embodiment 3

[0083] Embodiment 3: dilute acid extraction method and national standard method recovery rate comparison

[0084] Add a certain known concentration of each heavy metal solution to the unknown sample, measure the concentration of the heavy metal before and after the standard addition respectively, and calculate the recovery rate of the method, that is, the recovery rate=C 加标后 -C 加标前 ) / C 加标量 ×100%, the results are shown in Table 5. The standard addition recovery experiment is carried out according to the following method: get two parts of equal amount of vegetable samples (prepared according to the method of Example 1), wherein a certain amount of standard stock solution Cu, Zn, Cd is added (prepared according to the method of Example 2) , the other part was not added, and the sample was processed in the same way. The heavy metal content was measured, the recovery rate was calculated, and the recovery rates of the national standard method and the dilute acid method (perform...

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Abstract

The invention provides a method for detecting content of heavy metals in a plant sample, particularly a method for treating a to-be-detected sample in a sample pretreatment step by using dilute acid. Compared with a national standard method, the dilute acid method has wide application value, is easy and convenient to operate and rapid; and the national standard method is long in extraction time and easy to pollute and lose, and the dilute acid method is easy and wide to popularize. According to the method disclosed by the invention, heavy metal elements in vegetables are analyzed and measured, and the method has great significance for rapidly detecting the heavy metal elements in the vegetables.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for detecting heavy metal content in plant samples, especially vegetable samples. Background technique [0002] Food safety is an important issue that people generally pay attention to, and heavy metal pollution is one of the important issues of food safety. It is a harmful substance that pollutes the environment, vegetables and food and poses a great threat to human health. Monitoring and prevention of heavy metal pollution has become a hot issue of widespread concern around the world. With the advent of urbanization and industrialization, the discharge of urban domestic waste and industrial "three wastes" is increasing, and the unreasonable use of pesticides and fertilizers has seriously polluted the water, soil and air in the area, causing the ecological environment of the vegetable area to deteriorate. The environment is deteriorating day by day, causing the qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 曹德菊刘程张千刘儒枭刘仁京谢盼盼
Owner ANHUI AGRICULTURAL UNIVERSITY
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