Determination of micro cobalt(II) in water by 4-nitro-o-phenylenediamine-salicylaldehyde spectrophotometry
ZHANG Xia-hong1,2, DONG Yan1,2, ZHANG Li-yan1, ZHENG Pei-hong1, HE Li-fang1
1. Department of Chemistry and Material Engineering, Longyan University, Longyan 364012, China; 2. Fujian Provincial Colleges and University Engineering Research Center of Solide Waste Resource Utilization, Longyan 364012, China
Abstract：With the development of industry, the problem of cobalt pollution had become more and more serious, which posed a certain threat to the ecosystem of human health and the earth. The monitoring of cobalt should be strengthened. The spectrophotometry had attracted more and more attention due to its advantages such as simple operation, fast response, good selectivity, high sensitivity and low cost. The development of new coloring systems could provide more effective and convenient detection methods for the detection of cobalt. The color reaction between 4-nitro-o-phenylenediamine-salicylaldehyde (NPDAS) and cobalt(II) was studied. In the buffer solution of 2.0mL Na2CO3-NaHCO3 (pH 9.60), NPDAS could react with cobalt(II) to form a red complex with molar ratio of 1∶1, which had maximum absorption peak at 530nm. The mass concentration of cobalt(II) in range of 0.06-0.47mg/L had good linear relationship with the absorbance, and the correlation coefficient was 0.9961. The limit of detection was 0.03mg/L. The apparent molar absorptivity was 3.8×104 L·mol-1·cm-1. The proposed method was applied for the determination of trace cobalt(II) in water. The relative standard deviations (RSD, n=6) of determination results were between 2.3% and 3.8%. The spiked recoveries were between 95% and 105%. The found results were basically consistent with those obtained by atomic absorption spectrometry (AAS).
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