Method for detecting total phosphorus in water sample based on composite ratio fluorescent probe

A ratiometric fluorescent probe and detection method technology, applied in the field of detection of total phosphorus in water samples, can solve problems such as insufficient sensitivity, spectrophotometric interference, and insufficient sensitivity

Active Publication Date: 2019-08-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the sensitivity of the current method for the determination of total phosphorus in water samples is generally not high enough, which can barely meet the needs of the determination of total phosphorus in water bodies. There is a problem of insufficient sen...

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  • Method for detecting total phosphorus in water sample based on composite ratio fluorescent probe
  • Method for detecting total phosphorus in water sample based on composite ratio fluorescent probe
  • Method for detecting total phosphorus in water sample based on composite ratio fluorescent probe

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Embodiment 1

[0028] A simple, sensitive and selective analysis method for total phosphorus in water samples was established based on the complex ratio fluorescent probe of rare earth ion polymer and carbon quantum dots, including the following steps:

[0029] (1) Synthesis of EuCPs: pyromellitic acid (H 4 btec, 0.5mmol, 127.1mg) was dissolved in 80mL ultrapure water, then imidazole-2-carboxaldehyde (ICA, 1.0mmol, 96.1mg) was added, and after ultrasonication for 15min, the pH was adjusted to 2.0mol / L sodium hydroxide solution to 8.0, bright yellow H was obtained after stirring at room temperature for 6 h 4 btec-ICA solution, and finally the prepared EuCl 3 ·6H 2 O solution (10mL, 50mmol / L) was slowly added dropwise to H 4 In the btec-ICA solution, the EuCPs product was obtained after stirring at room temperature for 2 h. The reaction product was washed with high-purity water and centrifuged (12000 rpm, 10 min), and then vacuum-dried at 50° C. for 24 h to obtain EuCPs light yellow powder...

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Abstract

The invention discloses a method for detecting total phosphorus in a water sample based on a composite ratiometric fluorescent probe, and belongs to the technical field of environmental monitoring. According to the invention, a N,S-CQDs/EuCPs composite ratiometric fluorescent probe system is constructed based on a rare earth ionic polymer and carbon quantum dots. Except for slight influence of Fe3 +, other metal cations or inorganic anions have no obviously influence on a fluorescence intensity ratio of the probe, which indicates that the fluorescent probe system can realize a selective detection of phosphate radicals. The method is adopted to measure phosphate radical concentration in tap water, lake water, river water and human urine, and the measured phosphate radical concentration hasgood consistency with the result measured by a phosphomolybdic blue spectrophotometry method.

Description

technical field [0001] The invention relates to a method for detecting total phosphorus in water samples, in particular to a method for detecting total phosphorus in water samples based on a complex ratio fluorescent probe constructed by rare earth ion polymers and carbon quantum dots, and belongs to the technical field of environmental monitoring. Background technique [0002] Phosphorus in water can exist in the form of elemental phosphorus, metaphosphate, orthophosphate, pyrophosphate and organic phosphorus. Its main sources are domestic sewage, chemical fertilizers, organophosphorus pesticides, and phosphate builders used in modern detergents. Phosphorus in water is a key element needed for the growth of algae. Excessive phosphorus is the main cause of polluted water, eutrophication of lakes and red tides in bays. Total phosphorus is the result of converting various forms of phosphorus into orthophosphate after the water sample is digested, and it is measured in milligr...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/64
Inventor 童裳伦武会芳
Owner ZHEJIANG UNIV
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