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Method for testing total phosphorus in soil and sediments by virtue of microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)

A technology of ICP-AES and microwave digestion, which is applied in the preparation of test samples, measurement of color/spectral characteristics, sampling devices, etc. Practical value, simple and fast results in sample handling and measurement

Inactive Publication Date: 2014-12-10
浙江中一检测研究院股份有限公司
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Problems solved by technology

CN 103267734 A discloses a method for efficient digestion and rapid detection of total phosphorus in water quality, wherein the reagent digestion method solves the problems of complex process, time-consuming and energy-consuming, and cumbersome steps in the existing national standard detection method, and satisfies the on-site requirements for total phosphorus in water quality. Requirements for rapid testing

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  • Method for testing total phosphorus in soil and sediments by virtue of microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)
  • Method for testing total phosphorus in soil and sediments by virtue of microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)
  • Method for testing total phosphorus in soil and sediments by virtue of microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)

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Embodiment Construction

[0025] The present invention will be described in further detail in conjunction with specific embodiments.

[0026] 1.1 Instruments and reagents

[0027] Instruments: Inductively Coupled Plasma Emission Spectrometer, Microwave Digestion System, Electronic Analytical Balance; Freeze Dryer, Visible Spectrophotometer.

[0028] Reagents: hydrofluoric acid (excellent grade), nitric acid (excellent grade), 30% hydrogen peroxide (excellent grade), potassium dihydrogen phosphate (analytical grade), soil national standard material.

[0029] 1.2 Instrument working conditions

[0030] ICP-AES working conditions: RF generator power: 1300W; Cooling gas: 15.0L / min; Carrier gas flow: 0.8L / min; Plasma gas: 0.2L / min; Observation height: 15mm; Injection speed: 1.5ml / min.

[0031] Microwave digestion conditions: microwave power 1600W, heat up to 190°C for 30 minutes and keep for 15 minutes.

[0032] 1.3 Sample collection

[0033] Soil and sediment samples were taken from a river section in...

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Abstract

The invention provides a method for testing total phosphorus in soil and sediments by virtue of a microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). According to the method, the recovery rate is 97.5%-106.2%, the relative standard deviation is 1.6%-3.4%, the detection limit is 5.74mg / kg (when the weighing dosage of a sample is 0.2500g and the volume of a digestion solution is set as 50ml); the correlation coefficient of a working curve is more than 0.9999 at 0-10.00mg / L, and the linearity is good; the method has no obvious difference from a national standard method on the testing result, and moreover the sample processing and testing processes are simple, convenient and rapid, so that the method has a preferable practical value.

Description

technical field [0001] The invention relates to a method for determining phosphorus content, in particular to a method for determining total phosphorus in soil and sediment by a microwave digestion ICP-AES method. Background technique [0002] Phosphorus is a non-metallic element widely distributed on the earth. It mainly exists in the form of various phosphates in nature and is an essential element for biological metabolism. As important carriers of phosphorus in nature, soil and water system sediments play a vital role in the phosphorus cycle. Under the action of hydroscouring, the phosphorus in the soil can enter the water body. Excessive phosphorus content in the water body can cause excessive algae reproduction, which in turn leads to eutrophication of the water body. [0003] At present, the determination methods of phosphorus mainly include spectrophotometry, ion chromatography, atomic absorption spectrometry, inductively coupled plasma atomic emission spectrometry (...

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Application Information

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IPC IPC(8): G01N21/31G01N1/44G01N1/28G01N1/02
Inventor 何莲陈云飞吴越陈巧江帅徐越
Owner 浙江中一检测研究院股份有限公司
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