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

A lemon chrome yellow and detection method technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems that other sources of lead and chromium cannot be ruled out, rapid detection cannot be achieved, and the application range is not wide enough to achieve convenient focusing, Speed ​​up processing and avoid distracting effects

Active Publication Date: 2014-11-05
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

Atomic fluorescence spectrometry has the characteristics of high sensitivity, strong selectivity, small sample amount and simple method; but its disadvantage is that the scope of application is not wide enough
[0008] The above methods all identify the presence of heavy metals lead and chromium in the solution, and then infer the residual lemon 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 lemon 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 lemon chrome yellow in each process during the treatment of lemon chrome yellow wastewater.

Method used

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

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Embodiment 1

[0050] A method for detecting the concentration of lemon chrome yellow in heavy metal concentrated alkali liquid, comprising:

[0051] (1) Take heavy metal concentrated alkali liquids with different concentrations of lemon chrome yellow as test samples, and obtain each test sample at 2717.2cm -1 ~112.3cm -1 Raman spectra with a silicon wafer as a substrate in the wavenumber range.

[0052] In the present embodiment, a 96-well flat-bottomed culture dish (aperture: 6.4mm, bottom area: 0.32cm 2 , with a volume of 0.36ml) as a container, and one hole as a container. Place a circular silicon wafer with a diameter of 5mm and a thickness of 0.5mm at the bottom of each well, pipette 0.4ml of liquid into the well of the petri dish, and remove the excess liquid along the edge of the petri dish with a scraper , and then place the Petri dish on a glass slide for use.

[0053] The container containing the test samples is placed on the stage of the micro-Raman spectrometer to test the R...

Embodiment 2

[0075] Same as embodiment 1, the difference is that after building the calibration model in step (4), it also includes updating the calibration wavenumber and the calibration model, and the update method is as follows:

[0076] Perform analysis of variance on the first calibration model to screen the calibration wavenumbers, and use the screened calibration wavenumbers as the final calibration wavenumbers. The peak intensity at the standard wave number and 520cm -1 A linear regression model of the concentration-intensity ratio was constructed as the updated calibration model based on the ratio of the peak intensities at .

[0077] Perform variance analysis on the calibration model before updating, the results are shown in Table 2

[0078] Table 2

[0079]

[0080] Table 2 shows the wavenumber variable λ 1222 , lambda 1123 , lambda 112 (sample at wavenumber 1222cm -1 、1123cm -1 、112cm -1 Raman spectrum intensity at ) significant level P>0.05, indicating that the wave...

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Abstract

The invention discloses a method for detecting the concentration of lemon chrome yellow in a heavy metal concentrated alkali liquid. The method comprises the steps: taking heavy metal concentrated alkali liquids with different concentrations of lemon 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 lemon 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 lemon 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 lemon 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 lemon chrome yellow concentration detection, in particular to a method for detecting the lemon chrome yellow concentration in heavy metal concentrated alkali liquid. Background technique [0002] Lemon chrome yellow is one of lead chrome yellow. It is a pigment used for oily synthetic resin coatings, printing inks, watercolors and oil paints. It is an inorganic coloring pigment 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 composition is lead chromate, which is very harmful to the human body and can cause anemia, kidney damage, lead poisoning, dermatitis, eczema, chromic nose disease and skin ulcers, etc. The International Cancer Research Center (IARC) has Include "chromium and certain chromium compounds" as chemicals that are carcinogenic to humans. And ...

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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