Rapid detection method of organic mercury in water environment

A detection method, organic mercury technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems of organic mercury, operational complexity, cost increase, etc., and achieve strong anti-interference ability and easy use , no secondary pollution effect

Active Publication Date: 2014-10-29
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this indirect detection method does not take advantage of the Raman fingerprint spectrum to achieve the selective detection of organic mercury.
This method requires the use of Raman markers. Most of these Raman markers are also toxic pollutants, which will also cause environmental damage. The subsequent secondary pollution control will cause increased operational complexity and cost. The selectivity of ions is generally based on the premise that the concentration of interfering metal ions is low

Method used

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  • Rapid detection method of organic mercury in water environment
  • Rapid detection method of organic mercury in water environment
  • Rapid detection method of organic mercury in water environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take a 500mL round bottom flask, add 300mL ultrapure water and 30mg chloroauric acid in turn, and heat to boiling;

[0034] (2) Quickly add 3.5mL sodium citrate aqueous solution (1wt%);

[0035] (3) stop the reaction after 30min, cool to room temperature, centrifuge and concentrate 50 times to obtain the stock solution of gold nanoparticles, and save it for later use;

[0036] (4) Take 190 μL of methylmercury standard solutions of different concentrations (10ppb, 40ppb, 100ppb, 400ppb, 1000ppb, pH=4.5) and mix them with 10 μL of gold stock solution respectively, and detect them with a portable Raman spectrometer. Coordinates, with characteristic peak 485±10cm -1 The peak area of ​​the standard curve is plotted as the ordinate. The detection conditions are: Inspector portable Raman spectrometer from American DeltaNu company, laser wavelength 785nm, laser power 60mW, scanning time 1s, scanning times 10 times.

[0037] (5) Take 190 μL of the actual water sample and ...

Embodiment 2

[0040] (1) Obtain the stock solution of gold nanoparticles according to steps (1)-(3) in Example 1;

[0041] (2) Add 300 μL, 10 mM ethylenediaminetetraacetic acid disodium aqueous solution, sonicate for 1 hour, and save it for later use;

[0042] (3) Obtain the corresponding SERS spectrogram according to step (4) in Example 1, and draw a standard curve.

[0043] see results figure 2 and image 3

Embodiment 3

[0045] According to Example 2, the standard aqueous solution of 1 ppm methylmercury was detected, and the pH of the solution was 1.5.

[0046] Example 3

[0047] The 1ppb methylmercury standard aqueous solution was detected according to Example 2, and the pH of the solution was 1.5.

[0048] see results Figure 4

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Abstract

The invention discloses a rapid detection method of organic mercury in a water environment. The method can be used for achieving rapid semi-quantitative detection directly by a Raman intensified signal of organic mercury without pretreatment and any Raman marker. The method has the advantages of simplicity, rapidness, accuracy, high sensitivity, low cost, strong practicability and the like, can be expanded to rapid detection application of other heavy metal ions, and plays an important role in the aspects of industrial waste water online monitoring, spot check by the law-enforcing department, rapid emergency accident detection, large-scale sample detection and the like.

Description

technical field [0001] The invention relates to the field of rapid detection of heavy metals, in particular to the direct and rapid detection of organic mercury in water environment through surface-enhanced Raman spectroscopy. Background technique [0002] As a highly toxic heavy metal, mercury widely exists in nature, and it enters real life due to natural phenomena such as volcanic eruptions and deep forest fires, as well as artificial activities such as oil extraction and mercury mining. Due to its special physical and chemical properties, mercury is widely used in metallurgy, electroplating, chlor-alkali and other industries, and enters environmental water bodies through industrial wastewater. Inorganic mercury is transformed into organic mercury through the action of microorganisms in water, and then enters the food chain. Organic mercury is more toxic than inorganic mercury and can accumulate in the human body and damage the central nervous system. Long-term accumulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 郑南峰刘圣杰田中群
Owner XIAMEN UNIV
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