研究目的
To develop a sensitive spectrophotometric method for the determination of trace-level Co2+ in water based on acetate enhanced catalysis.
研究成果
The developed spectrophotometric method is sensitive, accurate, and has strong anti-interference capabilities, making it suitable for trace-level Co2+ determination in water samples, with a detection limit of 0.10 μg L?1 and good recoveries in practical applications.
研究不足
The method may be affected by high concentrations of interfering ions like Fe2+, Fe3+, and Cu2+, which have catalytic effects on PMS activation. Optimization is needed for varying water matrices.
1：Experimental Design and Method Selection:
The method involves catalytic decolorization of methylene blue (MB) using Co2+ as a catalyst and peroxymonosulfate (PMS) as an oxidizing agent, enhanced by acetate. Spectrophotometry is used to measure absorbance changes at 664 nm.
2：Sample Selection and Data Sources:
Water samples, including tap water and a standard solution (GSB 04-1767-2004) containing multiple ions, were used. Milli-Q water was employed for preparations.
3：List of Experimental Equipment and Materials:
Chemicals include cobalt nitrate hexahydrate, sodium acetate, methylene blue, oxone (2KHSO5·KHSO4·K2SO4), sodium thiosulfate pentahydrate, HCl, and NaOH. Equipment includes a Cary 60 UV–vis spectrophotometer (Agilent, USA), magnetic stirrer, and beakers.
4：Experimental Procedures and Operational Workflow:
Reactions were conducted in 100 mL beakers with 50 mL solution containing Ac?, MB, and Co2+ under stirring at 25°C. PMS was added to initiate decolorization. Samples were taken at intervals, quenched with Na2S2O3, and absorbance measured at 664 nm. Reaction time was optimized to 3.0 min.
5：0 min.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using linear regression for calibration curves, with detection limit calculated as 3s/k. Statistical analysis included standard deviation and relative standard deviation for accuracy and precision.
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