Method for measuring contents of ferrous, ferric iron and total iron in seawater

A determination method and technology of ferric iron, applied in the direction of color/spectral characteristic measurement, sampling device, etc., can solve the problems of cumbersome steps, increased pollution, tedious and time-consuming, etc., and achieve the effect of accurate results and precise measurement results

Inactive Publication Date: 2010-07-21
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The traditional spectrophotometric technique mainly uses o-phenanthroline as the chromogen, and its detection limit is 0.03mg / L, which does not meet the relatively low concentration of iron in seawater.
Therefore, when measuring seawater samples, it is necessary to pre-treat the water samples and enrich the iron for determination. Not only the steps are cumbersome, but also the possibility of pollution during the operation is increased.
The atomic absorption method and the inductive coupling method have high sensitivity and high accuracy, but they also need to pre-enrich the sample before analysis, which is very tedious and time-consuming, and the equipment is relatively expensive, which limits the scope of use
The cost of stripping voltammetry and chemiluminescence is low, the equipment is simple, and the detection limit is low, but the former is time-consuming and may be affected by many factors, and the reagent purification process before chemiluminescence is also difficult And it is difficult to determine the organic complex iron in seawater

Method used

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  • Method for measuring contents of ferrous, ferric iron and total iron in seawater
  • Method for measuring contents of ferrous, ferric iron and total iron in seawater
  • Method for measuring contents of ferrous, ferric iron and total iron in seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Collect 30mL of water samples from the farm workshop, immediately add 1.5mL of 2mol / L hydrochloric acid to adjust its pH to 1, use it as an acidified water sample, seal it, and store it at room temperature for later use.

[0047] 2) Add about 1.5 mL of 2 mol / L sodium hydroxide solution to the above acidified water sample to make the pH of the water sample reach 5, and use it as the water sample to be tested.

[0048] 3) Determination

[0049] First prepare blank control solution and standard solution. The blank control solution preparation method is as follows: first prepare the sodium chloride aqueous solution consistent with the initial salinity of the water sample to be tested, and add 2mol / L hydrochloric acid to make its pH reach 5; the standard solution preparation method is to take the above-mentioned blank control solution and add to which added FeCl 3 Make its total iron concentration 1mg / L.

[0050] 3.1 Color rendering:

[0051] Take 1 mL each of the bla...

Embodiment 2

[0069] 1) Collect 50mL of coastal water samples from Zhangzidao, Liaoning, immediately add 0.5mL of 1mol / L hydrochloric acid to adjust its pH to 2, use it as an acidified water sample, seal it, and store it at room temperature for later use.

[0070] 2) Add about 0.5 mL of 1mol / L sodium hydroxide solution to the above-mentioned acidified water sample to make the pH of the water sample reach 4, as the water sample to be tested.

[0071] 3) Determination

[0072] First prepare blank control solution and standard solution. The preparation method of the blank control solution is as follows: first prepare an aqueous sodium chloride solution consistent with the initial salinity of the water sample to be tested, and add 2mol / L hydrochloric acid to make its pH reach 4; the preparation method of the standard solution is to take the above-mentioned blank control solution and which added FeCl 3 Make its total iron concentration 1mg / L.

[0073] 3.1 Color rendering:

[0074] Take 3 mL ...

Embodiment 3

[0092] 1) Collect 15mL of water samples from a certain area of ​​the Yellow Sea, immediately add 0.3mL of 2mol / L hydrochloric acid to adjust its pH to 1.4, use it as an acidified water sample, seal it, and store it at room temperature for later use.

[0093] 2) Add about 0.3 mL of 2 mol / L sodium hydroxide solution to the above acidified water sample to make the pH of the water sample reach 6, and use it as the water sample to be tested.

[0094] 3) Determination

[0095] First prepare blank control solution and standard solution. The preparation method of the blank control solution is as follows: first prepare an aqueous sodium chloride solution consistent with the initial salinity of the water sample to be tested, and add 2mol / L hydrochloric acid to make its pH reach 4; the preparation method of the standard solution is to take the above-mentioned blank control solution and add which added FeCl 3 Make its total iron concentration 1mg / L.

[0096] 3.1 Color rendering:

[00...

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Abstract

The invention relates to a method for simply, conveniently and accurately measuring the contents of ferrous, ferric iron and total iron in seawater by utilizing a spectroscopic luminosity technology. The method comprises the following steps: fixing the ferrous and ferric iron in seawater sample, regulating the PH to slant acidity; taking ferrozine mono-sodium salt as a color reagent, setting the absorbance of a blank control solution the salinity and the PH of which are consistent with the seawater sample to be zero, and then measuring the absorbance of a standard solution and the seawater sample; adding a hydroxylamine hydrochloride solution into the blank solution, the standard solution and the seawater sample to completely reduce the ferric iron in the seawater, adding an ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution and the seawater sample; repeating the step of reduction, adding ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution for the third time; and finally, calculating the contents of the ferrous, the ferric iron and the total iron in the seawater sample, thus the problem of application restriction of the spectroscopic luminosity technology in measuring the content of iron in the seawater is solved.

Description

technical field [0001] The invention relates to a spectrophotometric technique, in particular to a method for measuring the contents of ferrous iron, ferric iron and total iron in seawater by utilizing the spectrophotometric technique. Background technique [0002] Spectrophotometry is a method of measuring the absorption spectrum of a substance by using ultraviolet light, visible light, infrared light and laser light, and conducting qualitative and quantitative analysis of substances and material structure analysis through this absorption spectrum. The commonly used determination methods of iron in seawater mainly include spectrophotometry, atomic absorption method, inductively coupled plasma emission spectrometry and mass spectrometry, stripping voltammetry and chemiluminescence. The traditional spectrophotometric technique mainly uses o-phenanthroline as the chromogen, and its detection limit is 0.03 mg / L, which does not meet the relatively low concentration of iron in se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/10
Inventor 吴志昊尤锋马得友徐冬冬张培军徐永立
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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