Determination the chroma of printing and dyeing wastewater by spectrophotometry (CAT#: STEM-PPA-0094-LJX)

Introduction

Printing and dyeing wastewater is a mixture of wastewater discharged in each process of printing and dyeing processing. With the rapid development of the dye industry and the progress of post-finishing technology, new auxilaries, dyes, finishing agents, etc., are widely used in the printing and dyeing industry, and the content of toxic organic ingredients that are difficult to degrade is also increasing, and some are even carcinogenic, mutagenic, teratogenic organic matter, which poses more and more threats and hazards to the environment, especially the water environment. Therefore, it is necessary to measure the water quality of dyeing wastewater before discharge. The chroma of water is an important index to evaluate the degree of water pollution. Spectrophotometry can be used to measure the chroma of wastewater.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the high-precision spectrophotometer is as follows: under a certain light source condition, the light is illuminated on the liquid sample, reflected to the grating spectrophotometer, and then the light signal is converted into an electrical signal, and finally into a digital signal, so as to evaluate the parameters of the liquid transmittance, absorbance, concentration, chroma and so on. By comparing the color parameter difference between the sample solution and the standard color level, the color difference between the sample solution and the standard color level can be judged.

Applications

For the determination of liquid color

Procedure

1. Power on: switch on the power source of the spectrophotometer and turn on the power switc
2. Correction: black and white correction as a benchmark for colorimetric measurement, be sure to be accurate
3. Standard sample measurement: set the light source conditions during measurement and measure the color parameters of the standard sample
4. Sample measurement: put the liquid to be measured into the colorimetric dish, and then put it in the measuring port of the spectrophotometer for sample measurement
5. Get the result: after the sample measurement is completed, the instrument will display the measurement result, that is, the color bias compared to the current standard sample and the sample

Materials

• Sample Type:
Printing and dyeing wastewater

Notes

1. When there is a large difference between the black-and-white correction environment and the current sample test environment (such as sharp temperature fluctuations), the instrument needs to be re-calibrated in time.
2. Clean the working surface of the whiteboard regularly, and properly store it under the conditions of avoiding light, dust and dry.

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