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Two-dimensional high-resolution method for determination of distribution of active phosphorus in wetland soil and deposit

A technology of sediment and active phosphorus, which is applied in the fields of environmental science and earth science, can solve the problems that are not suitable for the development of CID technology, and achieve the effects of shortening the placement time, simplifying the DGT device, and high resolution

Inactive Publication Date: 2014-09-17
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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Problems solved by technology

The existing commercial fixed membranes for DGT determination of phosphorus mainly use ferric hydroxide as a fixative, and ferric hydroxide will dissolve under strong acidic conditions, so it is not suitable for the development of CID technology

Method used

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  • Two-dimensional high-resolution method for determination of distribution of active phosphorus in wetland soil and deposit
  • Two-dimensional high-resolution method for determination of distribution of active phosphorus in wetland soil and deposit
  • Two-dimensional high-resolution method for determination of distribution of active phosphorus in wetland soil and deposit

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Embodiment Construction

[0050] According to the method of the invention, the two-dimensional distribution data of active phosphorus in Taihu Lake sediments is acquired. Put the DGT device into the sediment of East Taihu Lake in Taihu Lake, take it out after 1 day, transport it back to the laboratory, take out the fixed film for heat treatment, then coloring-scanning, convert the gray value into the cumulative amount of phosphorus, and obtain the active phosphorus in the sediment profile Content and spatial distribution.

[0051] Specific operations include:

[0052] (1) Preparation of improved phosphorus fixed film: mix zirconium dioxide powder and acrylamide solution with a water content of 45-55% at a mass volume ratio of 1:3 to 1:6, grind and ultrasonically break, and let stand to remove the precipitate After that, add 1 / 1600~1 / 1400 of tetramethyldiethylamine and 1 / 40~1 / 60 of 10% (wt) ammonium persulfate solution of the volume of acrylamide solution, mix well and inject the mixture into In the g...

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Abstract

A two-dimensional high-resolution method for determination of distribution of active phosphorus in wetland soil and a deposit is as follows: an improved ZrO2 phosphorus fixation film is assembled into a DGT (diffusive gradients in thin films) device, and then is put into the wetland soil or a deposit, and the active phosphorus penetrates a filter film in a manner of free diffusion, and immediately is synchronously captured by a phosphorus fixation film; the phosphorus fixation film is put in hot water of 85 DEG C for heat treatment for 5 days, then a colorant is put in for coloring, a scanner is used for two-dimensional high-resolution scanning of the colored film, ImageJ software is used for converting an image obtained by the scanning into gray scale, according to an established phosphorus accumulation amount and surface gray scale calibration curve of the phosphorus fixation film, the obtained gray scale is converted into phosphorus accumulation amount, the content of the active phosphorus in corresponding positions of the wetland soil or deposit sections can be calculated by use of Fick's first law of diffusion.

Description

technical field [0001] The invention belongs to the fields of environmental science and earth science, and relates to a two-dimensional and high-resolution measurement technology for active phosphorus in environmental media such as soil and sediment. Two-dimensional distribution characteristics of reactive phosphorus (DRP) in the plant profile. Background technique [0002] Phosphorus is an important nutrient element for the growth of aquatic organisms and the main limiting factor for primary productivity and eutrophication of water bodies. After exogenous phosphorus enters the wetland and lake water, most of it accumulates in the wetland soil and sediment, and is re-released into the overlying water under certain conditions to maintain the eutrophic state of the water. Under the condition that exogenous phosphorus input is contained, the phosphorus pollution of wetland soil or sediment is the main cause of water eutrophication. The release potential of phosphorus in wetla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 丁士明王燕
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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