A method for detecting the concentration of chrome yellow in heavy metal concentrated acid liquid

Abstract

The invention discloses a method for detecting the concentration of medium chrome yellow in a heavy metal concentrated acid liquid. In the method, heavy metal concentrated acid liquids with different concentrations of medium chrome yellow are used as test samples, and each test sample is obtained within a set wave number range using a silicon wafer as the test sample. The Raman spectrum of the substrate, and according to the Raman spectra of all test samples, the continuous projection algorithm and the multiple linear regression analysis method are respectively used to determine the calibration wavenumber, according to the concentration of chrome yellow in each test sample, and each calibration wavenumber The peak intensity and 520cm ‑1 The first linear regression model of the concentration-intensity ratio is constructed as the calibration model by the ratio of the peak intensity at the site, and the concentration of chrome yellow in the sample to be tested is obtained by using the calibration model measurement. Using the Raman test for analysis is easy to operate, does not require tedious and time-consuming sample preparation processes, and avoids interference from other sources to ensure the accuracy of the test medium chrome yellow, and the use of silicon as a comparison greatly improves the test accuracy. accuracy.

Description

technical field [0001] The invention relates to the technical field of medium chrome yellow concentration detection, in particular to a detection method for medium chrome yellow concentration in heavy metal concentrated acid liquid. Background technique [0002] Medium chrome yellow is one of lead chrome yellow. It is a pigment used for oily synthetic resin coatings, printing inks, watercolors and oil paints, as well as 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 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 ...

AI Technical Summary

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 medium 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 medium 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 chrome yellow in each process during the treatment of medium chrome yellow wastewater.

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