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Method for detecting hexavalent chromium in water sample

A detection method and hexavalent chromium technology, applied in the preparation of test samples, Raman scattering, material excitation analysis, etc., can solve the problems of large background interference, poor anti-interference ability, secondary pollution of electrodes, etc., to improve the analysis Detection sensitivity, easy to carry, the effect of eliminating interference

Inactive Publication Date: 2013-03-13
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they generally require a series of complex pretreatment processes for samples, so they cannot fully meet the needs of on-site rapid detection of hexavalent chromium content in water pollution incidents.
[0003] Due to the characteristics of large background interference and low concentration of analytes in wastewater samples, the application of spectrophotometry to the detection of hexavalent chromium in wastewater requires wet digestion and concentration treatment of the samples. Although this method can improve to the concentration of the analyte, but the interference of the background signal cannot be eliminated, and the operation process is complicated
The electrochemical method used in the detection of wastewater samples generally only needs to go through a simple pretreatment process such as filtration, but this technology often has the characteristics of poor stability, poor anti-interference ability, easy to be interfered by substances in water, and secondary pollution of electrodes.

Method used

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  • Method for detecting hexavalent chromium in water sample
  • Method for detecting hexavalent chromium in water sample
  • Method for detecting hexavalent chromium in water sample

Examples

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Embodiment 1

[0038] figure 1 Schematically provides the flow chart of the detection method of hexavalent chromium in the water sample of the embodiment of the present invention, as figure 1 As shown, the detection method comprises the following steps:

[0039] (A1) Heating the silver nitrate solution, then adding sodium citrate aqueous solution and polyvinylpyrrolidone solution and cooling, then centrifuging, removing the supernatant to obtain silver colloid; preferably, the heating temperature is 90-120°C.

[0040] (A2) using the silver colloid as an active substrate, using a Raman spectrometer to detect potassium dichromate to obtain a surface-enhanced Raman spectral fingerprint;

[0041] (A3) Add the silver colloid to the concentrated solution of the water sample to be tested, use a Raman spectrometer to detect the Raman spectrum, and compare the Raman spectrum and fingerprints to know whether the water sample to be tested contains six Valence chromium.

[0042] Optionally, the detec...

Embodiment 2

[0051] According to the application example of the detection method of the embodiment of the present invention 1 in the detection of waste water, specifically semi-quantitatively detect hexavalent chromium in the waste water, the specific method comprises the following steps:

[0052] (B1) Separation and enrichment of hexavalent chromium

[0053] figure 2 Schematically provides the basic structural diagram of the ion exchange column of the embodiment of the present invention, as figure 2 As shown, the exchange column is a glass column, the upper end diameter is 5cm, the lower end diameter is 0.6cm, and the column length is 10cm;

[0054] Accurately weigh 0.5g of AG1-X8 resin 1 and place it in a 100mL beaker, add 50mL of deionized water and stir, then transfer it to a small ion exchange column, open the lower piston 2 and close the piston after the deionized water flows out, and put 500mL of waste water Add it to an ion exchange column for adsorption, then elute with 0.5mL ...

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Abstract

The invention provides a method for detecting hexavalent chromium in a water sample, which comprises the following steps: (A1) heating a silver nitrate solution, adding a sodium citrate water solution and a polyvinylpyrrolidone solution, and cooling to obtain a silver colloid; centrifuging the prepared solution, and removing the supernatant for later use; (A2) by using the silver colloid as an active substrate, detecting potassium dichromate with a Raman spectrometer to obtain a surface-enhanced Raman spectroscopy fingerprint spectrum; establishing the relationship between Raman spectrum strength and concentration by using the spectrum; and (A3) adding the silver colloid into a concentrated solution of a water sample to be detected, detecting the Raman spectrum with a Raman spectrometer, and comparing the Raman spectrum with the fingerprint spectrum, thereby acquiring whether the water sample to be detected contains hexavalent chromium. The invention can accurately, quickly and effectively analyze hexavalent chromium and the like in the water sample.

Description

technical field [0001] The invention relates to element detection, in particular to a method for detecting hexavalent chromium in water samples. Background technique [0002] Hexavalent chromium is one of the five first-class harmful substances that are more harmful to the human body. According to my country's current industrial waste discharge standard (GBJ4-73), the maximum allowable discharge concentration in wastewater is 0.5mg / L; Hexavalent chromium in water is mainly caused by industrial wastewater pollution such as electroplating, smelting, and tanning. At present, the on-site rapid analysis and detection methods for determining the content of hexavalent chromium in wastewater include: portable spectrophotometric technology and electrochemical method, etc. Although these detection methods have good qualitative ability and high analytical sensitivity for hexavalent chromium. However, they generally require a series of complex pretreatment processes for samples, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/40
Inventor 李丹俞晓峰韩双来叶华俊
Owner FOCUSED PHOTONICS
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