Method for detecting concentration of light chrome yellow in heavy metal concentrated alkali liquid

A detection method and technology for heavy metals, applied in Raman scattering, material excitation analysis, etc., can solve the problems of inability to achieve rapid detection, inability to exclude other sources of lead and chromium, cumbersome processes, etc., to achieve convenient focusing, speed up processing, Simple to use effects

Active Publication Date: 2014-11-05
ZHEJIANG UNIV
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Problems solved by technology

[0005] More importantly, the above methods all identify the presence of heavy metals lead and chromium in the solution, and then infer the residual light chrome yellow content in the liquid, but in the process of liquid treatment, other sources of lead and chromium cannot be ruled out
Therefore, the detection of heavy metals lead and chromium alone cannot determine that the lead and chromium in the liquid must come from light chrome yellow
Moreover, a large amount of reagents are required for pretreatment when using the above method for detection, the process is cumbersome, and rapid detection cannot be achieved
In addition, there are few reports on the monitoring of residual light chrome yellow in each process during the treatment of light chrome yellow wastewater

Method used

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  • Method for detecting concentration of light chrome yellow in heavy metal concentrated alkali liquid
  • Method for detecting concentration of light chrome yellow in heavy metal concentrated alkali liquid
  • Method for detecting concentration of light chrome yellow in heavy metal concentrated alkali liquid

Examples

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Embodiment 1

[0047] A method for detecting the concentration of light chrome yellow in heavy metal concentrated alkali liquid, including:

[0048] (1) Use heavy metal concentrated alkali liquids with different light chrome yellow concentrations as test samples, and obtain each test sample at 2717.2cm -1 ~112.3cm -1 Raman spectrum with silicon wafer as substrate in the wave number range.

[0049] In this embodiment, a 96-well flat-bottom culture dish (aperture: 6.4mm, bottom area: 0.32cm 2 , The volume is 0.36ml) as a container, and a hole is a container. Place a round silicon wafer with a diameter of 5mm and a thickness of 0.5mm at the bottom of each hole. Use a pipette to transfer 0.4ml of liquid into the well of the petri dish, and use a scraper to remove the excess liquid along the edge of the petri dish , And then place the petri dish on the glass slide for use.

[0050] Place the container containing the test sample on the stage of the Raman microscope to test the Raman spectrum of each tes...

Embodiment 2

[0073] Same as embodiment 1, the difference is that after the calibration model is built in step (3), it also includes updating the calibration wave number and the calibration model. The updating method is as follows:

[0074] Perform variance analysis on the first linear regression model to screen the calibration wavenumber, and use the screened calibration wavenumber as the final calibration wavenumber, and according to the light chrome yellow concentration of all test samples, and the selected values ​​in the Raman spectrum. Peak intensity at scalar wave number and 520cm -1 The second linear regression model of the concentration-intensity ratio is constructed as the updated calibration model by the ratio of peak intensity at.

[0075] Perform variance analysis on the calibration model before updating, and the results are shown in Table 2

[0076] Table 2

[0077]

[0078]

[0079] Table 2 shows the wavenumber variable λ 526 , Λ 460 , Λ 416 , Λ 112 (Sample in wave number 526cm -1 , ...

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Abstract

The invention discloses a method for detecting the concentration of light chrome yellow in a heavy metal concentrated alkali liquid. The method comprises the steps: taking heavy metal concentrated alkali liquids with different concentrations of light chrome yellow as test samples, and acquiring Raman spectra of all the test samples in a set wave number range and with a silicon slice as a substrate; according to the Raman spectra of all the test samples, respectively using a continuous projection algorithm and a multivariate linear regression analysis method to determine calibration wave numbers; according to the light chrome yellow concentrations of all the test samples, and ratio values of the peak intensities of all the calibration wave numbers in the corresponding Raman spectra to the 520 cm<-1> peak intensity, building a concentration-strength ratio linear regression model as a calibration model, and measuring by using the calibration model to obtain the concentration of light chrome yellow in a to-be-measured sample. The method utilizes the Raman test for analysis, is simple to operate, does not need a tedious and time-consuming sample preparation process, at the same time, avoids interference from other sources so as to ensure the accuracy of the tested light chrome yellow, and greatly improves the test accuracy with silicon as a contrast.

Description

Technical field [0001] The invention relates to the technical field of light chrome yellow concentration detection, in particular to a method for detecting the light chrome yellow concentration in a heavy metal concentrated alkali liquid. Background technique [0002] Light chrome yellow is one of the lead chrome yellows. It is used as a pigment for oily synthetic resin coatings, printing inks, watercolors and oil paints, and inorganic coloring pigments for colored paper, rubber and plastic products. Because of its perfect pigment application Performance, relatively low price and complete color range, so it has been widely used. Its main chemical component is lead chromate. Lead chromate is harmful to the human body. It can cause anemia, kidney damage, lead poisoning, dermatitis, eczema, chromium rhinopathy and skin ulcers. The International Center for Cancer Research (IARC) has Include "chromium and certain chromium compounds" as chemical substances that are carcinogenic to hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 李晓丽孙婵骏何勇
Owner ZHEJIANG UNIV
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