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A kind of detection method of chromium content in chromium passivation waste liquid

A detection method and a technology of chromium content, which are applied in the field of chemical analysis, can solve the problems that the chromium content of chromium passivation waste liquid cannot be detected, etc.

Active Publication Date: 2020-10-23
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a detection method for the chromium content in the chromium passivation waste liquid, which mainly solves the technical problem that the chromium content in the chromium passivation waste liquid cannot be detected in the prior art, and is a cold-rolled hot-dip (aluminum) zinc product Provide a scientific basis for the harmless disposal and effective utilization of chromium passivation waste liquid generated in the production process

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  • A kind of detection method of chromium content in chromium passivation waste liquid

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Embodiment Construction

[0015] A method for detecting chromium content in chromium passivation waste liquid, comprising the following steps:

[0016] 1) Prepare the solution to be tested, weigh 10.0053g of chromium passivation waste solution and place it in a platinum crucible, first remove the moisture and organic resin in the sample, specifically, first heat the sample from 20°C at a heating rate of 4°C / min Heat to 105°C and hold for 180 minutes; then heat the sample from 105°C to 250°C at a heating rate of 8°C / min and hold for 15 minutes; then heat the sample from 250°C to 500°C at a heating rate of 8°C / min and hold for 30 minutes ;Finally, heat the sample from 500°C to 815°C at a heating rate of 10°C / min, and keep it warm for 120min;

[0017] Then add 3g of a mixed reagent of sodium carbonate and boric acid with a mass ratio of 2:1 to the platinum crucible; put the platinum crucible in a high-temperature furnace and melt at 1000°C for 15 minutes, take out the platinum crucible from the high-tempe...

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Abstract

The invention discloses a method for detecting the chromium content in a chromium passivation waste liquid. In the prior art, the chromium content in the chromium passivation waste liquid cannot be detected in the prior art. A purpose of the present invention is mainly to solve the technical problem in the prior art. The technical scheme is that the method comprises: preparing a to-be-detected solution; sequentially adding a phosphoric acid solution, a silver nitrate solution and an ammonium persulfate solution to the to-be-detected solution; adding a hydrochloric acid solution to the mixed solution containing the to-be-detected solution; adding an N-phenylanthranilic acid solution to the mixed solution containing the to-be-detected solution, carrying out titration on the mixed solution containing the to-be-detected solution by using an ammonium iron(II) sulfate standard solution until the solution is completely bright green, stopping the titration, and reading the titration volume; and calculating the chromium content in the to-be-detected chromium passivation waste liquid. With the method of the present invention, the chromium content in the chromium passivation waste liquid canbe accurately determined, the interference caused by a large amount of organic resins can be avoided, the detection data is accurate and reliable, and the scientific basis can be provided for the harmless disposal and effective utilization of the chromium passivation waste liquid.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a method for detecting chromium content in chromium passivation waste liquid, in particular to a method for detecting chromium in chromium passivation waste liquid produced in the production process of cold-rolled hot-dip (aluminum) zinc products content detection method. Background technique [0002] In the production process of cold-rolled hot-dip (aluminum) zinc sheet, in order to improve the anti-corrosion performance of cold-rolled hot-dip (aluminum) zinc sheet, it is usually necessary to passivate the surface of cold-rolled hot-dip (aluminum) zinc, and the chromium passivation solution It has the advantages of simple operation, low cost, easy control, bright color of the formed passivation film, outstanding weather resistance and wear resistance, and self-repair function, so it is widely used. However, a large amount of chromium passivation waste liquid will inevit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16G01N1/44
CPCG01N1/44G01N31/16
Inventor 周桂海王海军何晓丽
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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