A highly sensitive spectrophotometric method for the determination of active chlorine has been developed,based on the active chlorine oxidation of I - to I - 3,followed by the formation of the 1∶1 ion association com...A highly sensitive spectrophotometric method for the determination of active chlorine has been developed,based on the active chlorine oxidation of I - to I - 3,followed by the formation of the 1∶1 ion association complex of I - 3 with rhodamine B in the presence of polyvinyl alcohol.The molar absorptivity is 2.2×10 5L·mol -1 ·cm -1 .The interfering ions were not found in tap water but Fe(Ⅲ).The interference of Fe(Ⅲ) can be eliminated by adding potassium fluoride into sample solutions to achieve good selectivity.Active chlorine at μg/L levels in tap water has been satisfactorily determined by the method.展开更多
文摘A highly sensitive spectrophotometric method for the determination of active chlorine has been developed,based on the active chlorine oxidation of I - to I - 3,followed by the formation of the 1∶1 ion association complex of I - 3 with rhodamine B in the presence of polyvinyl alcohol.The molar absorptivity is 2.2×10 5L·mol -1 ·cm -1 .The interfering ions were not found in tap water but Fe(Ⅲ).The interference of Fe(Ⅲ) can be eliminated by adding potassium fluoride into sample solutions to achieve good selectivity.Active chlorine at μg/L levels in tap water has been satisfactorily determined by the method.
