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A Simple and Reliable Method to Determine 0.5-ppm of Nickel Ions in Wastewater

Paper Type 
Contributed Paper
A Simple and Reliable Method to Determine 0.5-ppm of Nickel Ions in Wastewater
Supamas Danwittayakul

Metal ion extraction combined with colorimetric method has been developed to determine NiII ions. Dimethylglyoxime (DMG) was added in a trace NiII solution served as extracted chelating agent for the NiII ions forming a reddish pink NiII-DMG particle. Determination at the parts per million level of NiII (0.5-5.0 ppm) was achieved by filtration of color Ni-complex on a filter paper, followed by simultaneous colorimetric analysis using a UV-VIS spectrophotometer (540 nm). Optimized pH of the NiII-DMG forming reaction giving uniform size and shape of NiII-DMG complex particles, was found to be at pH 9 buffered with sodium tetraborate. The detection limit (3-sigma) of the NiII determination by this method was 0.4 ppm. The accuracy and precision of the test method were evaluated on the recovery and relative standard deviation of the NiII determination (10 sets) at 1 and 2 ppm. Recovery percentages of the NiII detection at 1 and 2 ppm were 102 and 106%, while relative standard deviations were 5.8 and 4.6%, respectively. Interference ions were studied and found that AlIII and CrIII strongly interfered with the NiII determination. This could be solved by an addition of 0.2 mM N, N-dihydroxyethylglycine as a masking reagent giving good results of the detection of NiII at 1 and 2 ppm. The present method was applied for the detection of real water samples including tap water, river water and treated textile wastewater spiked with 1 and 2 ppm of NiII. The test results were accurate and precise to determine wastewater prior to discharge into the environment. This detection system enables simple and reliable on-site monitoring of NiII.

Start & End Page 
1555 - 1563
Received Date 
Revised Date 
Accepted Date 
Full Text 
Correspondence & Author Name 
simple detection, NiII determination, dimethylglyoxime, colorimetric method, metal ion extraction
Vol.48 No.6 (November 2021)
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Chiang Mai Journal of Science

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