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A method for the colorimetric detection of organic mercury by amphiphilic polymer-modified AUNPS

An amphiphilic polymer, organic mercury technology, applied in the field of analytical chemistry science, can solve problems such as poor selectivity and inability to detect organic mercury, and achieve the effect of high detection specificity

Active Publication Date: 2021-08-24
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a colorimetric sensor capable of quickly and efficiently detecting organic mercury, so as to solve the problems that existing colorimetric detection methods cannot detect organic mercury, especially organic mercury in seawater, soil and other systems, or have low sensitivity and poor selectivity.

Method used

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  • A method for the colorimetric detection of organic mercury by amphiphilic polymer-modified AUNPS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of HPEI-D1-C16 / AuNPs

[0028] Weigh 30 mg amphiphilic hyperbranched polymer HPEI-D1-C16, dissolve it in 6 mL chloroform, mix and shake with 6 mL chloroauric acid aqueous solution, and after the system is separated, take the lower organic phase liquid and add 0.5 g Dried over magnesium sulfate, then centrifuged, reacted at 45 ℃ for 3 h, and prepared amphiphilic hyperbranched polymer HPEI-D1-C16 stably modified AuNPs colorimetric probe.

Embodiment 2

[0029] Example 2 Investigation of the sensitivity of HPEI-D1-C16 / AuNPs to the detection of organic mercury

[0030] In the present invention, amphiphilic hyperbranched polymer-stabilized AuNPs are used as colorimetric probes to detect the presence of organomercury. During the detection process, when organic mercury exists, the system can be observed from the original red to yellow by the naked eye, and the characteristic absorption peak of the ultraviolet absorption spectrum is red-shifted, thereby realizing the colorimetric detection of organic mercury.

[0031] Take 4.0 mL HPEI-D1-C16 / AuNPs chloroform solution, add 0.5 mL ethylmercury chloride solution of different concentrations and 3.5 mL water, shake for 2-5 min, remove the lower organic phase liquid, add 1.0 mL 1.0 ×10 -3 M sodium borohydride / methanol solution, finally dilute to 6 mL with methanol, after standing still for 2 min, take pictures and test its UV-Vis absorption spectrum ( figure 1 A).

[0032] Depend on ...

Embodiment 3

[0033] Example 3 Investigation of the selectivity of HPEI-D1-C16 / AuNPs for the detection of organic mercury

[0034] In the experiment of amphiphilic hyperbranched polymer stabilized AuNPs as a colorimetric probe for the detection of ethylmercury chloride, a variety of metal ions (Hg 2+ , Ag + , Mg 2+ , Ba 2+ ,Sr 2+ , Pb 2+ , Mn 2+ , Zn 2+ , Cs + , Ni 2+ , Cu 2+ , K + ) were used as interference ions to investigate the detection selectivity of the colorimetric probe. Take 4.0 mL of HPEI-D1-C16 / AuNPs in chloroform (13 parts), add 0.5 mL respectively to the concentration of 1.0×10 -5 M of ethylmercury chloride and 0.5 mL at a concentration of 1.0 × 10 -4 Hg of M 2 + , Ag + , Mg 2+ , Ba 2+ ,Sr 2+ , Pb 2+ , Mn 2+ , Zn 2+ , Cs + , Ni 2+ , Cu 2+ , K + solution, after shaking for 3 min, remove the lower organic phase liquid, add 1.0 mL 1.0×10 -3 M sodium borohydride / methanol solution, and finally dilute to 6 mL with methanol, after standing still for 2 min,...

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Abstract

The invention discloses a preparation method of amphiphilic polymer-modified AuNPs and its application to the detection of organic mercury. Amphiphilic hyperbranched polymers with a core-shell structure were prepared by modifying hyperbranched polyethyleneimine (HPEI) with lipophilic fatty acid chlorides. The amphiphilic hyperbranched polymer can transfer the chloroauric acid in the aqueous phase to the organic phase based on the acid-base interaction, and can be reduced in situ to prepare AuNPs with high stability by virtue of the reducing ability of the HPEI amine groups. The amphiphilic polymer-modified AuNPs and organic mercury form Au-Hg alloy, which can change the color and ultraviolet-visible absorption spectrum of the system, and realize the highly selective detection of organic mercury, and the minimum detection limit can reach 1 ×10 ‑6 M. The probe can enrich organic mercury through phase transfer, so that the probe can be applied to highly sensitive and selective detection of organic mercury in systems such as seawater and soil with scattered distribution and low concentration.

Description

technical field [0001] The invention belongs to the field of analytical chemistry science, and relates to a preparation method of an amphiphilic hyperbranched polymer / gold nanoparticle composite probe applied to the detection of organic mercury. Background technique [0002] Mercury is a non-essential element widely present in nature. With the development of industry, nearly 5,000 tons of mercury in different forms are discharged around the world every year, which is extremely harmful to the environment and human health. Various forms of mercury and its compounds will cause multi-system damage to the body, mainly including neurotoxicity and renal toxicity. Among them, organic mercury has lipophilicity, bioaccumulation effect and biomagnification effect, and its toxicity is often hundreds of times that of inorganic mercury. Therefore, rapid detection of mercury ions is of great significance, which can effectively prevent and control or avoid its harm to the environment and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/58C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/78G01N21/31
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/58G01N21/31G01N21/78
Inventor 刘训恿边杰刘毅朱晨雪戴雨晴刘军深郭磊
Owner LUDONG UNIVERSITY
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