DGT-based method for synchronously measuring eight kinds of oxidized anions

An anionic and oxidized technology, applied in the field of DGT, can solve the problems of low capacity, low extraction efficiency, weak anti-interference ability, etc.

Inactive Publication Date: 2016-12-07
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a method for synchronously measuring 8 kinds of oxidized anions in soil, water body and sediment based on DGT technology, wherein the oxidized anions include P(V), As(V), Cr(VI), Mo( VI), Sb(V), Se(VI), V(V) and W(VI), which can overcome the low capacity, weak anti-interference ability and low extraction efficiency of the existing DGT technology for the determination of mixed anions. series of defects

Method used

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  • DGT-based method for synchronously measuring eight kinds of oxidized anions
  • DGT-based method for synchronously measuring eight kinds of oxidized anions
  • DGT-based method for synchronously measuring eight kinds of oxidized anions

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Embodiment 1

[0052]According to the method for synchronously measuring 8 kinds of oxidized anions in the environmental medium based on the DGT technology of the present invention, the distribution of the 8 kinds of oxidized anions in the sediment is measured. Take out the sediment column sample from Nanfei River, transport it back to the laboratory, insert the assembled Zr-oxide DGT device into the sediment, place it for 48 hours, take it out, analyze the 8 kinds of anions on the fixed film, and obtain DGT for each accumulation of anions. Simultaneously assembled PF and Metsorb DGT devices were respectively inserted back-to-back into the sediment with Zr-oxide DGT for comparison.

[0053] The specific operation steps include:

[0054] (1) DGT device assembly: the Zr-oxide membrane, the diffusion membrane, and the permeable membrane are stacked in sequence to assemble the DGT device;

[0055] (2) Nitrogen filling: put the DGT device into a container filled with deionized water, fill the w...

Embodiment 2

[0067] Use different concentrations of NaOH (0.1-0.5M) and 0.5M H 2 o 2 The extraction rate of phosphorus on the Zr-Oxide immobilized membrane was obtained from the mixed solution as a function of the extraction time. The result is as figure 2 As shown, it can be seen that using 0.2M NaOH-0.5M H 2 o 2 After the mixed solution was extracted for 3-5 hours, the extraction rate obtained was stable at about 80%, and then the extraction rate showed a tendency to decrease.

[0068] Determination of different concentrations of NaOH (0.1-0.5M) and 0.5M H 2 o 2 The change of the pH of the extract solution when the mixed solution extracts phosphorus from the Zr-Oxide immobilized membrane. The result is as image 3 As shown, it can be seen that figure 2 The decrease in phosphorus extraction rate after 5 hours in medium was due to the drop in pH, which was due to the H 2 o 2 Decomposition and concentration reduction caused.

[0069] Determination of 0.2M NaOH-0.5M H 2 o 2 Wh...

Embodiment 3

[0073] According to the method similar to Example 1, adopt Zr-oxide fixed membrane to measure 8 kinds of oxidized anions, the difference is to change the method of step (5) anion extraction, and the extractant is respectively 1.0M NaOH or 1.0M NaOH-1.0M H 2 o 2 The solution was mixed and the extraction time was 24 hours. The extraction rates of 8 kinds of oxidized anions were measured, and the results are shown in Table 2.

[0074] Table 2 Extraction rates of 8 kinds of oxidized anions accumulated on Zr-oxide immobilized membrane by existing extraction methods

[0075]

[0076] The above results show that when 1.0M NaOH is used, the extraction rate of Sb(V) is very low (7%), which cannot be used for the calculation of DGT concentration or accumulation; when 1.0M NaOH-1.0M H 2 o 2 , the extraction rate of phosphorus exceeds 100%, indicating that 1.0MH 2 o 2 If the concentration is too high, it will interfere with the color development of phosphorus. The above data show...

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Abstract

The invention discloses a DGT-based method for synchronously measuring eight kinds of oxidized anions. The oxidized anions include P (V), As (V), Cr (VI), Mo (VI), Sb (V), Se (VI), V (V) and W (VI). The method includes: on the basis of thin film diffusion gradient principles, adopting a zirconium dioxide polyacrylamide gel thin film (Zr-oxide film) as a fixing film, and assembling the fixing film, a diffusion film and an osmosis film into a DGT device; adopting a mild mixed solution 0.2M NaOH-0.5M H2O2 to further elute the anions accumulated on the fixing film for 3-5h; measuring accumulation amounts of the oxidized anions in the fixing film; calculating according to Fick first diffusion laws to obtain concentration of the oxidized ions. The Zr-oxide film is used for synchronously measuring the oxidized anions and has the characteristics of high DGT capacity and high interference resistance, and type of DGT measuring and number of synchronous measuring are increased; by adopting an extraction method, interference on phosphor measuring caused by too high H2O2 concentration of existing eluents, elution efficiency can be improved remarkably, elution time can be shortened, detection limit of DGT measuring of anions can be lowered, and analysis efficiency and accuracy are improved greatly.

Description

technical field [0001] The invention relates to a DGT method, in particular to a method for synchronously measuring 8 kinds of oxidized anions in environmental media such as soil and water (including sediment), which can be used for the migration activity of 8 kinds of anions in environmental media, biological Analysis and evaluation of effectiveness, pollution risk, etc. Background technique [0002] Diffusive Gradients in Thin Films (DGT) technology is a new speciation analysis technology, mainly developed by Davison and Zhang of Lancaster University in the mid-1990s. Based on the principle of ion diffusion, this technology obtains the activity information of ions in the medium through the gradient diffusion of target ions in the defined diffusion layer and the study of related processes. The device of DGT measurement technology is composed of a fixed layer and a diffusion layer. The ions pass through the diffusion layer in a diffusion manner, and then are captured by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N21/78G01N27/62G01N1/34
CPCG01N13/00G01N1/34G01N21/78G01N27/62G01N2013/003
Inventor 丁士明
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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