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Determination of Anions in Electroplating Sludge by Ion Chromatography

Why should we use ion chromatography to determine the anions in electroplating sludge?

Electroplating sludge is the remaining product after electroplating wastewater treatment. It contains very rich heavy metals and is one of the very typical hazardous wastes. It poses a great threat to the environment and human health. However, the sludge contained in the process Ions can cause damage to the equipment used in the recycling process. Therefore, the detection and treatment of anion residues in electroplating sludge is a very important work in the electroplating industry.

However, the traditional water extraction method cannot completely dissolve the sludge sample, resulting in low extraction efficiency of various anions, and it is impossible to accurately measure the anion content in the sludge. In addition, due to the large amount of heavy metals in the electroplating sludge, it is harmful to the environment and humans. Therefore, it is of great significance to find a detection method that is scientifically effective and simple in processing and can accurately determine the content of anions in the sample.

This method uses alkali fusion to pre-treat the sludge sample at high temperature, extract the anions in the sample, and measure it by ion chromatography.

Sample pre-treatment before determine the anions in electroplating sludge

Nickel crucible treatment: Take the clean nickel crucible and lid and burn it in a muffle furnace at 700°C for 1 hour until the crucible is red, take it out after cooling, boil it in boiling water for 1 hour, take it out and place it in a dry box to dry. spare;

Sample pretreatment:

Sample drying: put the sample in a drying box at 105°C with constant weight, take it out and cool it to room temperature;

Alkali addition: Take 0.8g NaOH and spread it flat on the bottom of the processed nickel crucible, weigh 0.2g of the dried sample on top of the flat NaOH, and then add 0.8g NaOH to form a sandwich structure, and cover the crucible lid;

Alkali melting: place in a muffle furnace, slowly raise the temperature to 300°C, hold for 10 minutes, then heat the muffle furnace to 500°C, burn for 30 minutes, and take it out after cooling;

Transfer in boiling water: Dissolve the sample in water after boiling at about 50°C, transfer it to a 100mL plastic volumetric flask after multiple washings, and cool it to a constant volume, shake it and let it stand still.

Purification: The processed sample solution is purified by an H-type pre-treatment column and filtered through a 0.45μm microporous filter membrane, and the filtrate is to be tested.

Instruments and equipment required for ion chromatography:

Ion Chromatograph: IC 6000 series

Autosampler: AS3100

Detector: Conductivity detector

Suppressor: electrolytic self-regenerative anion suppressor

Chromatographic conditions

Chromatographic column: Anion analysis column 4×250mm

Flow rate: 0.8mL/min

Eluent: carbonate system

Current: 30mA


Chromatogram of the standard
Chromatogram of sample nickel mud
Chromatogram of sample copper mud

The pre-treatment operation of the electroplating sludge anion determination process is very important. This method uses the alkali fusion method to extract the anions in the sample. During the process, attention should be paid to the temperature, the amount of alkali added, the handling of the utensils, other interferences, and the pretreatment of the sample solution. Leave a message to discuss.

IC6200 ion chromatography.



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