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Quantitative monitoring method for hexavalent chromium in foil washing water

A technology for hexavalent chromium and foil washing water, which is applied in the field of hexavalent chromium determination, can solve the problems of increasing the difficulty of hexavalent chromium wastewater treatment, interfering with water treatment procedures, and large fluctuations in content, so as to reduce the treatment difficulty and reduce the cost. , the effect of simple operation

Inactive Publication Date: 2018-12-25
JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the surface treatment process, the foil washing process after anti-oxidation treatment is the main source of hexavalent chromium in the water body. The content of hexavalent chromium in the foil washing water may range from tens of ppm to hundreds of ppm. When the fluctuation is large, it will greatly increase the difficulty of the treatment of hexavalent chromium wastewater, resulting in the accumulation of wastewater, which seriously interferes with the normal operation of the water treatment process.

Method used

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  • Quantitative monitoring method for hexavalent chromium in foil washing water
  • Quantitative monitoring method for hexavalent chromium in foil washing water
  • Quantitative monitoring method for hexavalent chromium in foil washing water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take four 25ml volumetric flasks, and add different volumes of 5ppm hexavalent chromium standard solution, respectively, in the amounts of 0.25ml, 0.50ml, 1.25ml, and 2.50ml. Add 1 ml of mixed acid and 1.0 ml of chromogenic agent to the above four volumetric flasks, dilute to the mark with water, shake well, and make standard chromogenic solutions containing different concentrations of hexavalent chromium. After standing for 20 minutes for color development, use The single-wavelength method measures the absorbance of each standard chromogenic solution on a spectrophotometer, and inputs the absorbance-concentration value into the instrument for linear fitting to obtain a standard curve. The coefficient of determination of the curve calibration is 0.9987, and the linear relationship is very good, indicating that the standard curve is qualified. The obtained standard curve is as figure 1 shown;

[0043] Use a pipette to take 5.00 ml of foil washing water, transfer it int...

Embodiment 2

[0052] Take four 25ml volumetric flasks, and add different volumes of 5ppm hexavalent chromium standard solution, respectively, in the amounts of 0.25ml, 0.50ml, 1.25ml, and 2.50ml. Add 1 ml of mixed acid and 2.0 ml of color developer to the above four volumetric flasks, dilute to the mark with water, shake well, and make standard color developer solutions containing different concentrations of hexavalent chromium. In the wavelength method, the absorbance of each standard chromogenic solution is measured on a spectrophotometer, and the absorbance-concentration value is input into the instrument to obtain a standard curve. The coefficient of determination of the curve calibration is 0.9989, and the linear relationship is very good, indicating that the standard curve is qualified. The obtained standard curve is as figure 2 shown;

[0053]Use a pipette to take 2.00 ml of foil washing water, transfer it into a 1000 ml volumetric flask, dilute with water to the mark, and shake w...

Embodiment 3

[0062] Take four 25ml volumetric flasks, and add different volumes of 5ppm hexavalent chromium standard solution, respectively, in the amounts of 0.25ml, 0.50ml, 1.25ml, and 2.50ml. Add 1 ml of mixed acid and 3.5 ml of color developer to the above four volumetric flasks, dilute to the mark with water, shake well, and make standard color developer solutions containing different concentrations of hexavalent chromium. In the wavelength method, the absorbance of each standard chromogenic solution is measured on a spectrophotometer, and the absorbance-concentration value is input into the instrument to obtain a standard curve. The coefficient of determination of the curve calibration is 0.9984, and the linear relationship is very good, indicating that the standard curve is qualified. The obtained standard curve is as image 3 shown;

[0063] Use a pipette to take 10.00 ml of foil washing water, transfer it into a 1000 ml volumetric flask, dilute with water to the mark, and shake ...

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Abstract

The invention discloses a quantitative monitoring method for hexavalent chromium in foil washing water. The quantitative monitoring method comprises the following steps that hexavalent chromium standard color developing solutions of different concentrations are prepared, and a standard curve is made; the foil washing water to be tested is diluted to a required concentration, two 25mL volumetric flasks are taken, one volumetric flask is filled with mixed acid, a color developing agent and the diluted foil washing water to be tested, constant volume and uniform shaking are performed to obtain liquid to be tested, the other volumetric flask is filled with ultrapure water, mixed acid and a color developing agent, constant volume and uniform shaking are performed to obtain a blank sample, and the hexavalent chromium content in the liquid to be tested is determined according to the obtained standard curve; and the actual hexavalent chromium content of the foil washing water to be tested is calculated according to the hexavalent chromium content in the liquid to be tested. The method is simple in operation, low in cost and high in analysis speed, can accurately determine the concentrationof the hexavalent chromium in the foil washing water, and effectively monitors the hexavalent chromium concentration in a water body, thereby reducing the difficulty of treating hexavalent chromium waste water.

Description

technical field [0001] The invention relates to the technical field of hexavalent chromium determination, in particular to a quantitative monitoring method for hexavalent chromium in foil washing water. Background technique [0002] The surface treatment process of copper foil involves anti-oxidation treatment, so that a passivation film is formed on the surface of copper foil to ensure that the copper foil will not be oxidized during the long-term placement process, resulting in product performance degradation. At present, the anti-oxidation treatment process used in the industry is mostly hexavalent chromium passivation. This passivation process can form a dense oxide film on the surface of copper foil, which has an excellent effect of isolating air and water, and can well meet the purpose of anti-oxidation of copper foil. [0003] The active ingredient of passivation solution is hexavalent chromium. Although hexavalent chromium has an excellent anti-oxidation effect, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31G01N2021/3185
Inventor 马科罗佳江泱范远朋
Owner JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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