期刊
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
卷 19, 期 8, 页码 1546-1552出版社
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532008000800014
关键词
cloud point extraction; ammonia determination; indophenol; spectrophotometry; water samples
资金
- Bu-Ali Sina University Research Council
- Center of Excellence in Development of Chemical Methods (CEDCM)
A rapid, selective and sensitive cloud point extraction process using the mixture of nonionic surfactant, Triton X-114, and cationic surfactant, cetyltrimethylammonium bromide (CTAB), to extract indophenol formed in the Berthelot reaction with ammonia from aqueous solutions was investigated. The method was based on the color reaction of ammonia with phenol under suitable oxidizing conditions in alkaline medium and cloud point extraction of produced indophenol dye. Effects of reaction and extraction parameters were studied and optimum parameters were established. Linearity was obeyed in the range of 2.00-125.00 ng mL(-1) of ammonia. The detection limit of the method was 1.00 ng mL(-1) of ammonia. The interference effect of some common ions was also tested. The method was applied to the determination of ammonium in natural water samples.
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