Method for separating and enriching trace metal and compound nanometer materials in water bodies

A nanomaterial, separation and enrichment technology, applied in the field of environmental analytical chemistry, can solve the problems of complex operation and the influence of complex matrix, and achieve the effect of large sample volume, high sensitivity and good selectivity

Inactive Publication Date: 2018-07-27
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the problems of complex operation and easy to be affected by complex matrix in the separation and enrichment of metal and its compound nanomaterials in the prior art, the present invention proposes a disc-based solid-phase extraction separation and enrichment of trace metal and its compound nanomaterials in water. material method

Method used

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  • Method for separating and enriching trace metal and compound nanometer materials in water bodies
  • Method for separating and enriching trace metal and compound nanometer materials in water bodies
  • Method for separating and enriching trace metal and compound nanometer materials in water bodies

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Embodiment 1

[0049] Example 1: Determination of the addition of AgNPs in actual water

[0050] (1) Separation and enrichment of AgNPs in four actual water samples by disc solid phase extraction

[0051] Actual water samples do not require any pretreatment. Add AgNPs to 50ng / L in the influent, effluent, river and lake water of a 1.0L sewage treatment plant, shake at 330rpm for ~1h, and use rapid qualitative filter paper to remove some traces of suspended solids in the water. Put the PVDF microporous filter membrane with a pore size of 0.45 μm into the replaceable membrane filter head and build it figure 1 device shown. After sucking the sample into the syringe, push out the syringe at 60mL / min until all 1.0L of the sample passes through the filter membrane. Take out the filter membrane, transfer it to a 1.5mL conical centrifuge tube, add 1.0mL 2% (m / v) FL-70, vortex at 2500rpm for 6h, take out the solution, and proceed to the next step of concentration determination, composition identifi...

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Abstract

The invention discloses a method for separating and enriching trace metal and compound nanometer materials in water bodies based on circular disc solid phase extraction. The method comprises the following steps of assembling a circular disc solid phase extraction device; controlling a sample to pass through a solid phase extraction circuit disc; using an elution agent for eluting the solid phase extraction circuit disc. By using the method, the 1000-time enrichment of the metal with the content as low as 0.2ng / L and the compound nanometer materials can be realized; the method can be used for mark determination of nanometer silver (AgNPa) in the four environment water bodies; the result is satisfactory. The method has the advantages that the operation steps are simple; through an injectionpump, the semi-automatic and speed-controllable extraction can be realized; the applicable sample size is large; the enrichment times are high. Meanwhile, in the extraction process, the appearance andthe particle diameter of the nanometer materials cannot be changed, so that after the nanometer material enrichment through circular disc solid phase extraction separation, the original appearance ofthe trace metal and the compound nanometer materials in the environment water bodies can be obtained.

Description

technical field [0001] The invention belongs to the field of environmental analytical chemistry and relates to a method for separating and enriching trace metals and their compound nanomaterials in water bodies based on disc solid phase extraction. Background technique [0002] Metals and their compound nanomaterials have excellent physical and chemical properties, and have been widely added to daily necessities and industrial products. During the production, use and disposal of these products containing metals and their compound nanomaterials, they will inevitably be released into the environment, causing potential harm to human health, living environment and social safety. Studies have shown that metal and its compound nanomaterials are genotoxic and cytotoxic, and can accumulate in organisms and amplify in the food chain (YJKim, SL Yang, JC Ryu, Mol.Cell.Toxicol.2010, 6, 119-125) . Since the toxicity of metal and its compound nanomaterials is closely related to its part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34
CPCG01N1/34
Inventor 刘景富周小霞赖余建
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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