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Method for determining total phosphorus content of soil or sludge

A technology of phosphorus content and sludge, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as harmful, cumbersome, and toxic to the environment and operators, and achieve the effects of avoiding secondary pollution, simplifying operation, and avoiding use.

Pending Publication Date: 2020-06-05
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, time-consuming and tedious pretreatment procedures such as solvent extraction and multi-step filtration must be used to exclude these substances before IC or HPLC detection
However, the extractants used are usually toxic organic solvents, such as chloroform, which are harmful to both the environment and the operator
Therefore, these methods have limitations in practical application

Method used

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  • Method for determining total phosphorus content of soil or sludge
  • Method for determining total phosphorus content of soil or sludge
  • Method for determining total phosphorus content of soil or sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 detects soil sample

[0035] (1) Sample pretreatment: air-dried, crushed, ground, and sieved soil samples from farmland in a certain place in Nanning, Guangxi. After testing, its basic physical and chemical properties are: red soil, pH=5.15. Take 0.25g of dry soil sample and 10mL of concentrated nitric acid into a 100mL polytetrafluoroethylene microwave digestion tank, seal the lid and carry out microwave digestion, heat for 10min at a temperature of 180°C;

[0036] (2) Conversion of phosphate: Dilute the solution obtained in step (1) with deionized water, then take 5ml of the solution and place it in a centrifuge tube, and add 5.0ml of sodium hydroxide solution (2.0mol / L), 0.5g of oxalic acid Calcium powder and 20mL deionized water; put the centrifuge tube in a constant temperature water bath shaker at 60°C for reaction, and filter the supernatant of the above solution with a filter membrane;

[0037] Put 1mL of the above filtrate and 1.0mL sulfuric acid...

Embodiment 2～6

[0056] Embodiment 2~6 detects various samples

[0057] Embodiments 2-6 detect different samples respectively, and each detection process condition is as shown in Table 1, and other operations not listed are the same as in Embodiment 1.

[0058] The detection condition of each sample of table 1 embodiment 2~6

[0059]

[0060]

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Abstract

The invention relates to the technical field of environmental monitoring and analysis, and discloses a method for determining total phosphorus in soil or sludge, which comprises the following steps: (1) pretreating a sample; (2) converting phosphate; (3) establishing a standard curve; (4) detecting the sample by headspace gas chromatography; (5) calculating a result. The method comprises the following steps: by utilizing a phase inversion headspace gas chromatographic analysis technology, firstly, enabling phosphate to react with a calcium oxalate solid under an alkaline condition to generatecalcium phosphate and release soluble oxalate, and then enabling oxalate to react with permanganate under an acidic condition to generate carbon dioxide gas; the content of total phosphorus in soil and sludge samples can be calculated by measuring chromatographic signal values of carbon dioxide generated after phosphate is converted twice. The method not only can simplify the operation process andgreatly reduce the influence of interfering substances, but also does not use an organic extraction agent, thereby avoiding secondary pollution and meeting the purpose of green chemistry. The methodprovided by the invention is especially suitable for large-batch sample analysis of soil and sludge related research units.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring and analysis, more specifically, to a method for measuring the total phosphorus content of soil or sludge. Background technique [0002] Total phosphorus (TP) is a basic physicochemical indicator of soil and sludge and reflects its utilization potential, e.g. poor soils usually have low TP content. On the other hand, if the total phosphorus content in soil and sludge is too high, it may cause harm to the environment. For example, the erosion of rainwater will bring excessive phosphorus into the water body and cause water eutrophication. Therefore, the effective determination of total phosphorus content in soil and sludge is of great significance to the research of soil improvement and sludge resource utilization. [0003] Since total phosphorus in soil and sludge samples includes both inorganic and organic phosphorus, a digestion process must convert all forms of phosphorus to so...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8679
Inventor 郑榆凯胡湛波张许波付维德朱仁诚
Owner GUANGXI UNIV
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