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Method for extracting phosphorus in different occurrence forms in marine sediments

A marine sediment and occurrence technology, applied in the environmental field, can solve the problem of inability to completely extract phosphorus in different occurrence forms of sediments, and achieve the effects of low cost, simple chemical reagents, and small sample volume

Pending Publication Date: 2021-09-03
TSINGHUA UNIV
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Problems solved by technology

[0005] In view of this, in order to solve the technical problem that the existing extraction methods cannot completely extract phosphorus in different forms of occurrence in sediments, the present invention provides a method for extracting phosphorus in different forms of occurrence in marine sediments, the purpose of which is to systematically and completely Extraction of Phosphorus in Different Occurrence Forms in Marine Sediments

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  • Method for extracting phosphorus in different occurrence forms in marine sediments
  • Method for extracting phosphorus in different occurrence forms in marine sediments
  • Method for extracting phosphorus in different occurrence forms in marine sediments

Examples

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Embodiment 1

[0047] A method for extracting phosphorus in different forms of occurrence in marine sediments, referring to figure 2 As mentioned, the specific steps are as follows:

[0048] In October 2019, the inventor of the present invention collected sediment samples with a thickness of about 10 cm on the surface layer at 12 stations in the coastal waters of Bohai Bay with a grab sampler, mixed them on site and sealed them in polyethylene sealed bags , stored at 4°C.

[0049] For the 12 sediment samples collected above, the extraction and determination of phosphorus in different forms were carried out according to the following steps. For the specific implementation flow chart, see figure 2 As shown, the detailed steps are as follows:

[0050] Step 1, add 20ml of 1mol / L MgCl to the 1# wet sediment sample equivalent to 1g dry sample 2 (pH=8), place the sediment sample and the extractant on a vortex mixer to mix evenly, at 25°C, place it on a Conrad shaker at 200r / min for oscillating...

Embodiment 2-12

[0058] The marine sediment samples 2#-12# were respectively processed in the manner of Example 1, and phosphorus in different occurrence forms was obtained.

[0059] The measurement result of embodiment 1-12 is as image 3 shown.

[0060] Depend on image 3 It can be seen that seven different forms of phosphorus can be obtained from marine sediment samples by using the graded extraction method of the present invention, and there are significant differences in the phosphorus content of various forms. like image 3 As shown, the change of phosphorus content in each form is detrital apatite (De-P)>organic phosphorus (OP)>closed storage phosphorus (Oc-P)>silicate detrital phosphorus (SIF-P)> Iron / aluminum adsorbed phosphorus (Fe / Al-P) > authigenic apatite and calcium-bound phosphorus (Ca-P) > weakly adsorbed phosphorus (Lsor-P), and detrital apatite in samples 1-12 Detrital phosphorus (De-P), organic phosphorus (OP), closed storage phosphorus (Oc-P), silicate clastic phosphoru...

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Abstract

The invention provides a method for extracting phosphorus in different occurrence forms in marine sediments, which comprises the following steps of performing continuous graded extraction on a marine sediment sample, and extracting phosphorus in the sample step by step by adopting different extracting agents to obtain phosphorus in different occurrence forms. The extraction method provided by the invention can comprehensively extract phosphorus in different occurrence forms in marine sediments, is high in extraction rate, and is convenient for systematic research on the forms of phosphorus in the ocean.

Description

technical field [0001] The invention relates to the field of environmental technology, in particular to a method for extracting phosphorus in different forms in marine sediments. Background technique [0002] Phosphorus is an essential component for the growth and reproduction of marine plankton, and is the basis of marine primary productivity and food chain. The river input is the main source of phosphorus in the ocean, and the sediment is an important reservoir of phosphorus in the water body. The exchange of phosphorus between the two is significant, but the amount of bioavailable phosphorus that can participate in the exchange depends on the occurrence form of phosphorus in the sediment. , when factors such as temperature, pH value, and bioturbation of the depositional environment change, only weakly adsorbed phosphorus, closed storage phosphorus, iron / aluminum adsorbed phosphorus, and organic phosphorus can diffuse from the sediment to the overlying water body, and are ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/34G01N1/44G01N1/42
CPCG01N1/28G01N1/34G01N1/44G01N1/42
Inventor 孙健赵海萍李清雪林斌良付超高亚茹梁秀莲
Owner TSINGHUA UNIV
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