Method for detecting content of hexavalent chromium ions in passivating solution

A hexavalent chromium ion and detection method technology, which is applied in the field of detection of hexavalent chromium ion content in passivation solution, can solve the problems of affecting the accuracy of results, relevant certification obstacles, and great interference of colorimetry

Inactive Publication Date: 2016-11-09
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To detect such a large amount of Cr 3+ Cr in the sample 6+ , the operation steps in the detection process are likely to affect the accuracy of the results. In addition, because its color is very dark, its contrast color method interferes a lot
Cr of such samples 6+ The test is difficult to obtain convincing results due to the above reasons, and the relevant certification of this type of product is also hindered by this result

Method used

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  • Method for detecting content of hexavalent chromium ions in passivating solution

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Effect test

Embodiment 1

[0021] A detection method for hexavalent chromium ion content in passivation solution, comprising the following steps:

[0022] (1) Accurately measure 1mL of sample 1, add 3mL of 10wt% 5-Br-PADAP ethanol solution and 10mL of sodium carbonate-sodium bicarbonate solution with a pH of 9 to sample 1, and stir for 10 minutes;

[0023] (2) The solution after the reaction is introduced into a separatory funnel, and 10 mL of chloroform is added for extraction three times at a time, the aqueous phase and the organic phase are separated, and the aqueous phase is collected;

[0024] (3) adjust the pH of the aqueous phase to 2.5 with sulfuric acid;

[0025] (4) Add diphenylcarbazide acetone solution to develop color, and set the volume to 100 mL;

[0026] (5) Measure the absorbance at 540nm after the sample is color developed and constant volume with a UV-visible spectrophotometer, and calculate the sample Cr 6+ content.

Embodiment 2

[0028] A detection method for hexavalent chromium ion content in passivation solution, comprising the following steps:

[0029] (1) Accurately measure 1mL of sample 2, add 3mL of 10wt% 5-Br-PADAP ethanol solution and 10mL of sodium carbonate-sodium bicarbonate solution with a pH of 9 to sample 2, and stir for 30min;

[0030] (2) The solution after the reaction is introduced into a separatory funnel, and 10 mL of chloroform is added for extraction three times at a time, the aqueous phase and the organic phase are separated, and the aqueous phase is collected;

[0031] (3) adjust the pH of the aqueous phase to 1.5 with sulfuric acid;

[0032] (4) Add diphenylcarbazide acetone solution to develop color, and set the volume to 100 mL;

[0033] (5) Measure the absorbance at 540nm after the sample is color developed and constant volume with a UV-visible spectrophotometer, and calculate the sample Cr 6+ content.

Embodiment 3

[0035] A detection method for hexavalent chromium ion content in passivation solution, comprising the following steps:

[0036] (1) Accurately measure 1mL of sample 3, add 3mL of 10wt% 5-Br-PADAP ethanol solution and 10mL of sodium carbonate-sodium bicarbonate solution with a pH of 9 to sample 3, and stir for 20 minutes;

[0037] (2) The solution after the reaction is introduced into a separatory funnel, and 10 mL of chloroform is added for extraction three times at a time, the aqueous phase and the organic phase are separated, and the aqueous phase is collected;

[0038] (3) adjust the pH of the aqueous phase to 2 with sulfuric acid;

[0039] (4) Add diphenylcarbazide acetone solution to develop color, and set the volume to 100 mL;

[0040] (5) Measure the absorbance at 540nm after the sample is developed and constant volume by UV-visible spectrophotometer, and calculate the sample Cr 6+ content.

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Abstract

The invention discloses a method for detecting the content of hexavalent chromium ions in a passivating solution. The method comprises the following steps: 1, accurately measuring a passivating solution sample, adding a complexing agent and a buffer solution to the sample, and carrying out a stirring reaction for 10-30min; 2, introducing a solution obtained after the reaction to a separating funnel, adding an organic solvent to extract, separating a water phase and an organic phase, and collecting the obtained water phase; 3, adding an acid solution to the water phase in order to adjust the pH value of the water phase to 1.5-2.5; 4, adding an acetone solution of diphenylcarbazide, carrying out color development, and adding a solvent to a constant volume; and 5, determining the absorbance of a sample obtained in step 4 by using an ultraviolet and visible spectrophotometer at 540nm, and calculating the content of Cr<6+> in the sample. The method adopting a 5-Br-PADAP complexing agent and a sodium carbonate-sodium bicarbonate buffer solution with the pH value of 9 to separate out various interference ions and remove interference colors, so the content of the hexavalent chromium ions can be accurately determined.

Description

technical field [0001] The invention relates to the technical field of metal ion detection methods, in particular to a detection method for the content of hexavalent chromium ions in a passivation solution. Background technique [0002] On the one hand, the rapid development of emerging electronic technologies has led to continuous upgrading of products. For example, in just over 10 years, the CPU has changed from 386 to the current Core multi-core, and the main frequency has changed from 386 8MHz to Core i5 (quad-core) single-core 2.8GHz. It is updated every one or two years: On the other hand, while enjoying technological progress, people are also forced to face mountains of electronic waste, and the environmental problems of electronic waste are also being paid more and more attention. The treatment of electronic and electrical waste in various countries is basically based on landfill. The harmful substances in these electronic wastes, such as Pb, Cd, Hg, etc., enter the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 尤为
Owner WUXI EPIC TECH
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