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Amphipathic polymer modified AuNPs (Au nanoparticles) organic mercury colorimetric detection method

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: 2019-04-05
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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  • Amphipathic polymer modified AuNPs (Au nanoparticles) organic mercury colorimetric detection method

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, t...

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Abstract

The invention discloses a preparation method of amphipathic polymer modified AuNPs and application of the amphipathic polymer modified AuNPs to organic mercury detection. According to the preparationmethod of the amphipathic polymer modified AuNPs, oleophilic fatty acyl chloride is applied to modifying hyperbranched polyethyleneimine (HPEI) to prepare an amphipathic hyperbranched polymer with a core-shell structure; the amphipathic hyperbranched polymer can be based on acid-alkali interaction to transfer chloroauric acid in aqueous phase into organic phase, and by means of the reducing capability of amido of the HPEI, can achieve in situ reduction to prepare high-stability AuNPs. The amphipathic polymer modified AuNPs can interact with organic mercury to form Au-Hg alloy to result in change of a system in color and ultraviolet-visible absorption spectrum and further to achieve high-selectivity detection of the organic mercury with a minimum detection limit as low as 1*10<-6> M. The amphipathic polymer modified AuNPs can gather the organic mercury through phase transfer, thereby, when applied to systems such as discrete-distribution and low-concentration seawater and soil, being high in sensitivity and selectivity of organic mercury detection.

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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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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