Method for rapidly measuring concentration of hexavalent chromium water solution

A rapid determination of hexavalent chromium technology, applied in color/spectral characteristic measurement, special data processing applications, instruments, etc., can solve the problems of expensive instruments and equipment, high monitoring and maintenance costs, cumbersome analysis process, etc., to save Eliminate equipment maintenance costs, save testing costs, and save time

Inactive Publication Date: 2009-07-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is effective to use the above methods to monitor the concentration of hexavalent chromium, and the monitoring accuracy is also high, there are also relatively expensive instruments and equipment, relatively high monitoring costs and maintenance costs, and the analysis process is relatively cumbersome. , and the defect that the concentration of hexavalent chromium cannot be continuously measured on-line in real time, and it also has a certain negative effect of polluting the environment

Method used

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  • Method for rapidly measuring concentration of hexavalent chromium water solution
  • Method for rapidly measuring concentration of hexavalent chromium water solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015]Complete the test in sequence according to the following steps: first step, successively measure the absorbance of the standard hexavalent chromium aqueous solution with concentrations of 0.04mM, 0.08mM, 0.2mM, 0.6mM, 1mM, 2mM and 3mM at the light wavelength of 348nm. In the second step, the absorbance of the above-mentioned 7 different standard concentrations of hexavalent chromium aqueous solution determined by the least square method is used to establish a linear fitting of the concentration to the absorbance at a wavelength of 348nm to obtain a linear fitting curve y=-0.0672+1.59744x ; Where, y is the absorbance of the corresponding concentration of the hexavalent chromium aqueous solution at 348nm, and x is the concentration of the corresponding concentration of the hexavalent chromium aqueous solution. The 3rd step, first measure the hexavalent chromium aqueous solution of the concentration to be tested that the standard concentration is 0.05mM hexavalent chromium a...

Embodiment 2

[0017] Complete the test successively according to the following steps: the first step and the second step are the same as in Example 1. The 3rd step, the absorbance of the hexavalent chromium aqueous solution that the standard concentration is 0.16mM at the wavelength of 348nm place is 0.2023 for the hexavalent chromium aqueous solution of the selected concentration to be tested earlier, then this value is substituted into the linear fitting curve y=- The concentration of the hexavalent chromium aqueous solution calculated from 0.0672+1.59744x to be measured is 0.169mM. It can be seen that the error between the two is very small.

Embodiment 3

[0019] Complete the test successively according to the following steps: the first step and the second step are the same as in Example 1. The 3rd step, first measure the hexavalent chromium aqueous solution of the concentration to be tested that the standard concentration is that the hexavalent chromium aqueous solution of 0.40mM is that the absorbance at the wavelength of 348nm is 0.5488, then this value is substituted into the linear fitting curve y=- The concentration of the hexavalent chromium aqueous solution of the concentration to be measured calculated from 0.0672+1.59744x is 0.387. It can be seen that the error between the two is very small.

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Abstract

The invention discloses a quick measurement method of hexavalent chrome water-solution concentration, comprising the following steps; a first step of measuring the absorbency of the hexavalent chrome water-solution of more than two different concentrates at wavelength 346-350nm; a second step of establishing the linear fitting of the concentration to the absorbency of the hexavalent chrome water-solution of more than two different concentrates at 346-350nm using a least square method to obtain a linear fitting curve y=a+bx, wherein a, b are constant, y is the absorbency of the hexavalent chrome water-solution of the corresponding concentration at 346-350nm, x is the corresponding concentration of the hexavalent chrome water-solution; a third step of firstly measuring the absorbency of the hexavalent chrome water-solution of the concentrated to be measured at 346-350nm and substituting the absorbency into the linear fitting curve y=a+bx to calculate the concentration of the hexavalent chrome water-solution of the concentrated to be measured. The quick measurement method can perform the on-line real-time continuous measurement of the hexavalent chrome of different concentration, therefore quick measurement method can be widely used for quickly and accurately measuring the hexavalent chrome.

Description

technical field [0001] The invention relates to a method for measuring the concentration of a chromium aqueous solution, in particular to a method for quickly measuring the concentration of a hexavalent chromium aqueous solution. Background technique [0002] Chromium compounds are among the most dangerous compounds in water and soil pollution. In nature, chromium mainly exists in two forms: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). The chemical properties of trivalent chromium are stable, usually in the form of Cr(OH) 3 (s) and Cr x Fe 1-x (OH) 3 and other insoluble salts exist. Hexavalent chromium is relatively active in nature and usually exists in an ion state. Low content of trivalent chromium is an essential element for human life, and its biological toxicity is relatively low, while hexavalent chromium is a carcinogen confirmed by human beings and has a strong oxidation effect. After being absorbed into the blood, it reacts with biological m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G06F19/00
Inventor 刘培生曾海波蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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