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Method for fast enriching and detecting trace amount of As (V) and Cr (VI) contained in water by filling microcolumn by utilizing fiber

A technology for detecting water and micro-columns, which is applied to the above-mentioned analysis device to enrich and detect trace amounts of As and Cr in water. It can solve the problems of difficult detection of heavy metal ions, shorten the time of separation and enrichment, reduce the amount of use, and be easy to operate. Effect

Inactive Publication Date: 2013-03-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem that traces of heavy metal ions in water are difficult to detect; The detection of As(V) and Cr(VI), this method not only retains the advantages of fast injection speed and high enrichment factor of solid-phase micro-column, but also the fiber material has fast elution speed and good reuse effect

Method used

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  • Method for fast enriching and detecting trace amount of As (V) and Cr (VI) contained in water by filling microcolumn by utilizing fiber
  • Method for fast enriching and detecting trace amount of As (V) and Cr (VI) contained in water by filling microcolumn by utilizing fiber

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Effect test

specific Embodiment 1

[0035] Prepare a separation column with a fiber filling capacity of 25 mg, adjust 100 mL of As(V) solution with a concentration of 0.8 ppb to about pH 5.0, control the flow rate of 3 mL / min to flow through the enrichment device, and then use 1 mL of eluent at a flow rate of 0.5 mL / min The adsorbed fibers were eluted in minutes, and a chromogenic agent was added to detect with an ultraviolet spectrophotometer. The detection wavelength was 880nm, and the recovery rate of As(V) reached 95.2%.

specific Embodiment 2

[0036] Prepare a separation column with a fiber filling capacity of 25 mg, adjust 100 mL of As(V) solution with a concentration of 4 ppb to about pH 5.0, control the flow rate of 3 mL / min to flow through the enrichment device, and then use 1 mL of eluent at a flow rate of 0.5 mL / min The adsorbed fibers are washed out, a color developer is added, and the detection wavelength is 880nm with an ultraviolet spectrophotometer, and the recovery rate of As(V) reaches 95.8%.

specific Embodiment 3

[0037] Prepare a separation column with a fiber filling capacity of 25 mg, adjust 100 mL of As(V) solution with a concentration of 10 ppb to about pH 5.0, control the flow rate of 1 mL / min to flow through the enrichment device, and then use 1 mL of eluent at a flow rate of 0.5 mL / min The adsorbed fibers are washed out, a color developer is added, and the ultraviolet spectrophotometer is used for detection. The detection wavelength is 880nm, and the recovery rate of As(V) reaches 96.3%.

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Abstract

The invention provides a method for detecting a trace amount of As (V) and Cr (VI) which are contained in a water sample, and particularly relates to a method for enriching As (V) and Cr (VI) by filling quaternary ammonium fibers into a microcolumn and utilizing a solid-phase extraction method and detecting As (V) and Cr (VI) by adopting an ultraviolet spectrophotometry, relating to the technical field of waste water detection. The method solves the technical problem that the analysis of a trace amount of metal ions contained in the water sample is limited on water treatment as the conventional detection method is insufficient in selectivity and detection limit due to matrix effect and other interference existing during the analysis of the trace amount of metal ions contained in the water sample. The method for enriching As (V) and Cr (VI) by filling the quaternary ammonium fibers into the microcolumn and utilizing the solid-phase extraction method and detecting As (V) and Cr (VI) by adopting the ultraviolet spectrophotometry comprises the following steps: filling self-made quaternary ammonium ion exchange fibers into the microcolumn; placing into a solid-phase adsorption separation device so that As (V) and Cr (VI) are adsorbed to the self-made quaternary ammonium ion exchange fibers; and detecting eluted analytes by adopting the ultraviolet spectrophotometry. The method disclosed by the invention has the characteristics of simple process, little time consumption and easiness and convenience for operation without special pretreatment of the water sample and can meet the requirements for trace amount analysis by respectively achieving the detection limits of As (V) and Cr (VI) at 0.2 ppb and 0.8 ppb.

Description

technical field [0001] The invention relates to the technical field of wastewater detection, in particular to a method for enriching and detecting trace amounts of As(V) and Cr(VI) in water by using a fiber microcolumn. [0002] The invention also relates to a method of use of the above analysis device. Background technique [0003] Heavy metals arsenic and chromium are two very toxic elements, even in low concentrations are still very harmful. They mostly exist in inorganic forms (Cr(III) / Cr(VI), As(III) / As(V)) and organic forms in the water environment. These heavy metal ions are difficult to degrade in the environment and will pass through the water environment. Aquatic organisms are enriched and concentrated in the body, and enter the human body (animal) through the food chain, causing various diseases and dysfunction. Therefore, there is an urgent need to detect trace amounts of arsenic and chromium in order to understand their hazards. [0004] The existing atomic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/28G01N1/40
Inventor 魏俊富郭海涛王会才
Owner TIANJIN POLYTECHNIC UNIV
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