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Method for treating solution containing trace mercury ions and solid phase extraction adsorbent used

A technology of mercury ions and adsorbents, which is applied in the field of solid phase extraction adsorbents used in the treatment of solutions containing trace mercury ions, can solve problems such as difficulties and sensitivity that cannot meet the actual measurement, and achieve the effect of improving selectivity

Inactive Publication Date: 2011-12-07
JIANGSU TEACHERS UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the records of relevant documents, the detection limit of this instrument to divalent mercury is 0.2ug / mL (Handbook of Analytical Chemistry (Second Edition), third volume, spectral analysis, Beijing: Chemical Industry Press, p148), to directly It is still very difficult to determine trace amounts of mercury in the environment, because the sensitivity of the instrument cannot meet the needs of actual determination

Method used

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  • Method for treating solution containing trace mercury ions and solid phase extraction adsorbent used
  • Method for treating solution containing trace mercury ions and solid phase extraction adsorbent used
  • Method for treating solution containing trace mercury ions and solid phase extraction adsorbent used

Examples

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preparation example 1

[0019] (Preparation example 1, anatase type nano-titanium dioxide)

[0020] The preparation process of the anatase-type nano-titanium dioxide in this preparation example is: heat and dissolve titanium sulfate in water, and hydrolyze it at a temperature of 80°C to 120°C for 5 to 15 minutes, then cool it to 60°C to 80°C, and then add the corresponding weight The urea and the surfactant sodium dodecylbenzenesulfonate generate hydrated titanium dioxide through a uniform precipitation reaction, and react at a constant temperature of 77°C to 83°C for 1 to 4 hours under continuous stirring to make the precipitation reaction as complete as possible. After the reaction is over, filter and separate the hydrated titanium dioxide from the mother liquor, wash the precipitate with deionized water until it does not contain sulfate, then dry it at 80°C-120°C for 4-10 hours, grind it into powder, and finally dry it at 450°C-550°C Calcined for 1 to 3 hours to obtain anatase-type nano-titanium d...

preparation example 2

[0022] (Preparation example 2, the solution that contains trace mercury ion made by standard reference sample GBW08303)

[0023] The solution containing trace amounts of mercury ions in this preparation example is prepared from a mercury-containing substance sample, and the mercury-containing substance sample is the standard reference sample GBW08303. The method for preparing the solution containing trace mercury ions by the standard reference sample GBW08303 is as follows:

[0024] The first step is to use aqua regia digestion method (also known as aqua regia digestion method) to pre-treat the standard reference sample GBW08303: accurately weigh 2.0g of the standard reference sample GBW08303 sample and place it in a small beaker, and wet it with a small amount of deionized water , adding 10 mL of freshly prepared aqua regia, and cold digestion (also known as cold digestion) overnight. In the second step, place the above-mentioned small beaker on a temperature-controllable el...

preparation example 3

[0025] (Preparation example 3, the solution that contains trace mercury ion made by standard reference sample GBW (E) O70009)

[0026] The solution containing trace amounts of mercury ions in this preparation example is prepared from a mercury-containing substance sample, which is the standard reference sample GBW(E)O70009. The remainder of the method for preparing the solution containing trace mercury ions by described standard reference sample GBW (E) O70009 is identical with the preparation method of preparation example 2, and difference is: the standard reference sample of 2.0g used is GBW ( E) O70009.

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Abstract

The invention discloses a method for treating a solution containing trace mercury ions and a solid-phase extraction adsorbent used therein. The method comprises: 1. preparing a solid phase extraction adsorbent; 2. using the solid phase extraction adsorbent to adsorb mercury ions in a solution containing trace amounts of mercury ions; 3. eluting the mercury ions adsorbed on the solid phase extraction adsorbent with hydrochloric acid solution, And make this hydrochloric acid solution become the eluent containing mercury ion. The solid phase extraction adsorbent is at a temperature of 55°C to 65°C, in the presence of a strong electrolyte with an ionic strength of 0.025mol / L to 0.035mol / L dissolved in water and under the action of sodium lauryl sulfate The method is obtained by modifying nano-titanium dioxide with thiourea; the nano-titanium dioxide is anatase-type nano-titanium dioxide. The method of the invention is convenient to operate and has good mercury ion enrichment effect. The solid-phase extraction adsorbent has good adsorption selectivity to divalent mercury ions and large adsorption capacity.

Description

technical field [0001] The invention relates to a method for treating a solution containing mercury ions and the composition used therefor. Background technique [0002] Divalent mercury and its compounds are very toxic, especially in aqueous solution, because free mercury ions can react with organic matter such as biogas produced by bacteria in aqueous solution and convert them into organic mercury, and organic mercury is more toxic than inorganic mercury. Mercury is stronger. The pollution caused by mercury and its compounds is very harmful to the environment. Among the eight major public hazards that shocked the world, there is Minamata disease caused by mercury poisoning. Since mercury is highly toxic and easily bioaccumulated, and accumulates in the human body through the food chain to cause poisoning, the analysis and determination of mercury in water and the environment is of great significance. [0003] Inductively coupled plasma-atomic emission spectrometer (ICP-A...

Claims

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Application Information

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IPC IPC(8): G01N1/40B01J20/06G01N21/73B01D15/08
Inventor 连宁唐江宏贺香红张国华张继振
Owner JIANGSU TEACHERS UNIV OF TECH
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