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Water-quality total phosphor efficient digestion and rapid detection method

A water quality and high-efficiency technology, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of time-consuming and energy-consuming, and achieve the effects of avoiding secondary pollution, low energy consumption, and rapid detection

Inactive Publication Date: 2013-08-28
CHINA THREE GORGES UNIV +1
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Problems solved by technology

[0007] In view of the above background technical analysis, in order to solve the technical problems of high temperature and high pressure assisted sample digestion, time-consuming and energy-consuming, and detection assistance in the detection of total phosphorus in water quality, an experimental determination of high-efficiency and rapid detection of total phosphorus in water quality by ultrasonic-assisted Fenton reagent digestion under normal temperature and pressure conditions is proposed. method

Method used

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  • Water-quality total phosphor efficient digestion and rapid detection method
  • Water-quality total phosphor efficient digestion and rapid detection method
  • Water-quality total phosphor efficient digestion and rapid detection method

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Experimental program
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Embodiment 1

[0033] Three phosphorus-containing organic compounds, adenosine triphosphate (ATP), adenosine diphosphate (ADP) and adenosine monophosphate (AMP), were used as digestion objects. image 3The technical route is digested, and the digestion efficiency of this method is evaluated at the same time.

[0034] see image 3 Ultrasound-assisted Fenton reagent efficient digestion and rapid detection of water quality total phosphorus technical route, the concentration range of selected hydrogen peroxide is 7 ~ 45mM, further preferably hydrogen peroxide H 2 o 2 13.6mM; the metal ion catalyst is Fe 2+ , the concentration range of the metal ion catalyst is 0.08~17mM, further preferably, FeSO 4 3.2mM; the acidic medium is non-reducing acid H with a pH range of 1.5~4.3 2 SO 4 , further preferred pH is 2.7; Chromogenic solution used: ammonium molybdate H 8 MON 2 o 4 2.1mM, ascorbate C 6 h 8 o 6 0.5mM.

[0035] Taking ATP, ADP, and AMP with a P concentration of 0.1 mg / L as the ana...

Embodiment 2

[0041] Digestion solution used in this embodiment: hydrogen peroxide H 2 o 2 32.4mM, FeSO 4 13.5mM, HSO 4 pH=3.8; Chromogenic solution used: ammonium molybdate H 8 MON 2 o 4 2.5mM, Ascorbate C 6 h 8 o 6 0.7mM.

[0042] According to the above standard curve, press image 3 The experimental technical route and method described are based on the actual water sample, and the detection value of the actual water sample is referred to by the national standard method (potassium persulfate digestion-ammonium molybdate spectrophotometry (GB / T 11893-1989)), which is consistent with this The experimental data of the field comparison test of the method are shown in Table 2.

[0043] Table 2 Comparative test results of total phosphorus content in actual water samples

[0044]

[0045] As can be seen from Table 2, the determination method of the present invention is basically close to the detection results of the actual water sample by the national standard method of wate...

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Abstract

The invention relates to a water-quality total phosphor efficient digestion and rapid detection method under normal temperature and normal pressure; in acidic medium, Fenton reagent (FeSo4 and H2O2), Fe2+catalysis H2O2 generate hydroxyl radical (.OH) with very strong oxidizability to oxidize and digest a plurality of phosphorus containing compounds like organic phosphor in the water sample; meanwhile, under the effect of ultrasonic cavitation, oxidation and digestion reaction of phosphor of various valences like pyrophosphate, metaphosphate and polyphosphate etc. are prompted. The method of rapid detection of total phosphor by ultrasound-assisted Fenton reagent can solve the problems of complex process, time consuming and energy consuming, tedious steps and high temperature and high pressure for digestion of existing national standard method in prior art, and meet the requirement of on-site rapid detection of water-quality total phosphor.

Description

technical field [0001] The invention relates to the technical field of environmental water quality monitoring and analysis, and relates to a method for efficient digestion and rapid detection of water quality total phosphorus under normal temperature and pressure conditions. Background technique [0002] Phosphorus in environmental water mainly exists in the form of elemental phosphorus, organic phosphorus (that is, phosphate combined with organic groups), orthophosphate, condensed sulfate, pyrophosphate, metaphosphate, etc., and its main sources are domestic sewage, chemical fertilizers, etc. , organophosphorus pesticides and phosphate builders used in modern detergents, etc. Total phosphorus refers to the phosphorus content of all phosphorus-containing compounds in water samples per unit volume (generally in mL). Total phosphorus is an important water quality monitoring parameter for controlling eutrophication of water bodies. One of the water quality parameters that must...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/44
Inventor 魏康林陈明张进
Owner CHINA THREE GORGES UNIV
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