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Determination method of arsenic and mercury content in plant samples and sample pretreatment method

A sample pretreatment and sample technology, which is applied in the field of arsenic, sample pretreatment, and mercury content determination in plant samples, can solve the problems of low reliability of determination results, and achieve the effect of easy operation.

Active Publication Date: 2021-10-15
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first purpose of the present invention is to provide a sample pretreatment method for determining the content of arsenic and mercury in plant samples, aiming at overcoming the fact that the content of arsenic and mercury in the digestion solution obtained in the prior art cannot truly reflect the content of arsenic and mercury in plant samples. The content of arsenic and mercury, which makes the determination results low reliability

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  • Determination method of arsenic and mercury content in plant samples and sample pretreatment method
  • Determination method of arsenic and mercury content in plant samples and sample pretreatment method
  • Determination method of arsenic and mercury content in plant samples and sample pretreatment method

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Embodiment 1

[0045] This embodiment provides a sample pretreatment method for determining the content of arsenic and mercury in plant samples, which includes:

[0046] a. Pretreatment step: After cleaning the plant samples collected in the field, dry them at 80° C., crush the dried plant samples and pass them through a 100-mesh nylon sieve for later use.

[0047]b. Digestion step: Dry the spare plant samples in an oven at 60°C for 2 hours, put them in a drying dish and weigh them after cooling. Accurately weigh 0.5g (accurate to 0.1mg) of the plant sample, place it in a digestion tube, add 8mL of concentrated nitric acid, tighten the lid of the digestion tube and place it in a microwave digestion apparatus, and digest the sample according to the digestion procedure in Table 1.

[0048] Table 1. Plant sample digestion procedure in Example 1

[0049] Digestion stage Heating rate Climb temperature temperature holding time power The first stage 10℃ / min 100℃ 5min 12...

Embodiment 2

[0052] This embodiment provides a sample pretreatment method for determining the content of arsenic and mercury in plant samples, which includes:

[0053] a. Pretreatment step: After cleaning the plant samples collected in the field, dry them at 75° C., crush the dried plant samples and pass them through an 80-mesh nylon sieve for later use.

[0054] b. Digestion step: Dry the spare plant samples in an oven at 55°C for 2.5 hours, put them in a drying dish and weigh them after cooling. Accurately weigh 1 g (accurate to 0.1 mg) of the plant sample, place it in a digestion tube, add 8 mL of concentrated nitric acid, tighten the lid of the digestion tube and place it in a microwave digestion apparatus, and digest the sample according to the digestion procedure in Table 2.

[0055] Table 2. Plant sample digestion procedure in Example 2

[0056] Digestion stage Heating rate Climb temperature temperature holding time power The first stage 22℃ / min 80℃ 4min ...

Embodiment 3

[0059] This embodiment provides a sample pretreatment method for determining the content of arsenic and mercury in plant samples, which includes:

[0060] a. Pretreatment step: After cleaning the plant samples collected in the field, dry them at 85° C., crush the dried plant samples and pass them through a 120-mesh nylon sieve for later use.

[0061] b. Digestion step: Dry the spare plant samples in an oven at 65°C for 1.5 hours, put them in a drying dish and weigh them after cooling. Accurately weigh 1 g (accurate to 0.1 mg) of the plant sample, place it in a digestion tube, add 8 mL of concentrated nitric acid, tighten the lid of the digestion tube and place it in a microwave digestion apparatus, and digest the sample according to the digestion procedure in Table 3.

[0062] Table 3. Plant sample digestion procedure in Example 3

[0063] Digestion stage Heating rate Climb temperature temperature holding time power The first stage 18℃ / min 90℃ 3min ...

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Abstract

The invention provides a method for determining the content of arsenic and mercury in plant samples and a sample pretreatment method, and relates to the field of trace element analysis. It includes: mixing the plant sample with nitric acid, and performing microwave digestion by using a microwave digestion method, and the microwave digestion includes three gradient digestion stages. The pretreatment method can avoid volatilization loss of arsenic and mercury due to high temperature during the digestion process, thereby improving the precision and accuracy of determining the content of arsenic and mercury. In addition, this method can obtain a digestion solution containing both arsenic and mercury through only one digestion process, which is easy to operate and saves labor and time.

Description

technical field [0001] The invention relates to the field of trace element analysis, in particular to a method for determining the content of arsenic and mercury in plant samples and a sample pretreatment method. Background technique [0002] Detection of toxic substances (such as arsenic and mercury) in plant samples is very important for ecological environment pollution and food safety. At present, for the detection of arsenic and mercury in plant samples, atomic absorption spectrometry, atomic fluorescence spectrometry and inductively coupled plasma emission spectrometry are mainly used in laboratories. [0003] The use of this type of detection method requires pre-digestion treatment of the plant samples, so that the arsenic and mercury contained in the plant samples can be dissolved into the digestion solution during the digestion process. At present, the sample pretreatment method used in the determination of arsenic and mercury in plant samples is mainly water bath d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44G01N21/64
CPCG01N1/44G01N21/6404G01N2021/6406
Inventor 白景文张远彬杨靖刘美玉王首同陈洋
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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