Synchronization acquisition method of active phosphorus and iron in deposit

A simultaneous acquisition and sedimentation technology, which is applied in the preparation of test samples, measurement of color/spectral characteristics, and material analysis by observing the influence of chemical indicators, etc., can solve the difficulties of investigation, high cost, and low acquisition efficiency, etc. problem, to achieve the effect of short acquisition time, simple operation procedure and high efficiency

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

Due to the very significant spatial heterogeneity of sediments, obtaining phosphorus and iron content separately not only has the disadvantages of low acqui...

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  • Synchronization acquisition method of active phosphorus and iron in deposit
  • Synchronization acquisition method of active phosphorus and iron in deposit
  • Synchronization acquisition method of active phosphorus and iron in deposit

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and example the method of the present invention is further described.

[0043] Put the DGT device in the method of the present invention into the Meiliang Bay sediment in Taihu Lake, take it out after 48 hours, transport it back to the laboratory, analyze the phosphorus and iron on the fixed film, and convert the phosphorus and iron accumulation on the fixed film Obtain the content and spatial distribution of reactive phosphorus and iron in sediment profiles.

[0044] The concrete operation of described method comprises the following steps:

[0045] (1) Preparation of phosphorus-iron synchronous enrichment fixed membrane: Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 50±5% and 3-5mL of 30% polyacrylamide aqueous solution, grind, add 0.6-1g Chelex-100 cation exchange Stir the resin evenly to obtain a film-forming solution; add 4-8 μL of tetramethyldiethylamine (TEMED) and 12-16 μL of 10% (wt) ammo...

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Abstract

A synchronization acquisition method of active phosphorus and iron in a deposit is disclosed; the principle of diffusive gradients in thin films (DGT) can be used, a fixing film and a diffusion film which are capable of performing phosphorus and iron synchronous enrichment are combined into a DGT acquisition device, the DGT acquisition device is put into the deposit for 2-6 days, active phosphorus and iron ions in the deposit pass through the diffusion film in a way of free diffusion, and then are acquired by the fixing film; after the DGT acquisition device is taken out, accumulation contents of phosphorus and iron on the fixing film can be respectively analyzed by use of a slicing-two step extraction-micro amount colorimetric method, and contents of the active phosphorus and iron in the deposit can be calculated by use of the Fick's first law of diffusion.

Description

technical field [0001] The invention relates to a method for synchronously obtaining active phosphorus and iron in environmental media such as soil and sediment, which can be used for the migration activity, biological effectiveness, pollution risk and the migration and transformation relationship of active phosphorus and iron in environmental media, etc. analysis and evaluation. Background technique [0002] Diffusive Gradients in Thin Films (DGT) technology is a new speciation analysis technology, mainly developed by Davison and Zhang of Lancaster University in the mid-1990s. Based on the principle of ion diffusion, this technology obtains the activity information of ions in the medium through the gradient diffusion of target ions in the defined diffusion layer and the study of related processes. The device of DGT measurement technology is composed of a fixed layer and a diffusion layer. The ions pass through the diffusion layer in a diffusion manner, and then are capture...

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N1/40
Inventor 丁士明陈义飞
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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