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Rapid on-site detection method for trichlorfon and simazine in seawater

A detection method, the technology of trichlorfon, applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems of high-throughput screening of difficult analytes, time-consuming selectivity, expensive labor, etc., and achieve rapid High-efficiency portability, easy operation, and wide-ranging effects

Active Publication Date: 2018-10-19
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However many of these methods are time-consuming, expensive and labor-intensive
Furthermore, they often require complex sample pretreatment procedures and thus are not easily applicable for high-throughput screening of analytes in complex samples
In recent years, Chinese patent (publication number CN 102507820 A) detects trichlorfon in trace amounts by molecular imprinted solid phase extraction and gas chromatography; Chinese patent (publication number CN107655990A) detects simazine in farmland environment by gas chromatography Although the above two methods are accurate and highly sensitive, they still have the disadvantages of selectivity, time-consuming and expensive

Method used

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  • Rapid on-site detection method for trichlorfon and simazine in seawater
  • Rapid on-site detection method for trichlorfon and simazine in seawater
  • Rapid on-site detection method for trichlorfon and simazine in seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Detection of trichlorfon and simazine by surface-enhanced Raman technology

[0027] (1) Preparation of gold nanorods by seed crystal method

[0028] a. Preparation of gold nano seed solution: 10mL 0.1M cetyl ammonium bromide (CTAB) aqueous solution and 0.25mL 0.01M tetrachloroauric acid aqueous solution were mixed evenly at a temperature of 25-28°C, then quickly added 0.6mL 0.01M Sodium borohydride solution (preserved in an ice-water bath), stirred for 3 minutes, and left to stand at room temperature at 25-28°C for 2 hours before use. At this time, the gold concentration was 0.25 mmol / L.

[0029] b. Preparation of gold nanorods: Mix 10mL 0.1M cetyltrimethylammonium bromide aqueous solution with 0.01M tetrachloroauric acid aqueous solution at a temperature of 25-28°C, and then add 0.1mL 0.01M silver nitrate and 0.2mL 1M hydrochloric acid, stir well, add 0.08mL 0.1M ascorbic acid as reducing agent, the solution turns from dark yellow to colorless, add 12μL pr...

Embodiment 2

[0040] Embodiment 2: detect trichlorfon and simazine in seawater

[0041] Figure 8 A flow chart of trichlorfon and simazine in seawater according to an embodiment of the present invention is schematically provided, and the detection method includes the following steps:

[0042] (1) Gold nanorods are prepared by the seed crystal method, and the steps are the same as in Example 1;

[0043] (2) Prepare the gold nanorod material (Au NRs / L-Cys) modified by L-cysteine, the steps are the same as in Example 1;

[0044] (3) Synthesize gold nanospheres by the hydrothermal method, the steps are the same as in Example 1;

[0045] (4) Prepare the gold nanosphere composite (ATP / Au NPs) modified by p-mercaptoaniline, the steps are the same as in the examples; 1

[0046] (5) Preparation of gold nanorod and gold nanosphere composite material (Au NRs / L-Cys@ATP / Au NPs), the steps are the same as in Example 1;

[0047] (6) SERS detection of trichlorfon and simazine in seawater.

[0048] Thr...

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Abstract

The invention discloses a rapid on-site detection method for trichlorfon and simazine in seawater. The method comprises the following steps: (1) synthesizing gold nanorods by a seeding method; (2) adding L-cysteine to a gold nanorod solution to obtain an L-cysteine -modified gold nanorod material; (3) hydrothermally synthesizing gold nanospheres; (4) adding p-aminothiophenol to gold nanospheres toobtain a p-aminothiophenol-modified gold nanosphere composite; (5) mixing the L-cysteine -modified gold nanorod material with the p-aminothiophenol-modified gold nanosphere composite to obtain a goldnanorod and gold nanosphere composite as a SERS active substrate by peptide bonding; and (6) detecting the trichlorfon and the simazine by a Raman spectrometer to achieve qualitative and quantitativeanalysis of the trichlorfon and the simazine in the seawater. The rapid on-site detection method has the characteristics such as rapid analysis, high sensitivity, small sample consumption, wide application range, simple operation and convenient carrying.

Description

technical field [0001] The invention belongs to the technical field of rapid detection of organic pollutants in the marine environment, and in particular relates to an on-site rapid detection method for trichlorfon and simazine in seawater. Background technique [0002] Pesticides such as trichlorfon and Simazine are widely used as protective fungicides in the field of agriculture to promote the growth of plants. However, due to its high toxicity, biological and environmental persistence, pesticides cause adverse health effects in coastal environments such as seawater, sediments and marine products. According to the regulations of the US Environmental Protection Agency and the European Union, the maximum allowable concentrations of individual pesticides and total pesticides in drinking water are 0.1 μg / L and 0.5 μg / L, respectively. Therefore, it is urgent to establish an on-site rapid detection method for trichlorfon and simazine in seawater. [0003] Traditional detection...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹段化珍马亚丹杜乐邓维
Owner SHANGHAI INST OF TECH
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