流动注射光纤动力学荧光法测定锰──锰－二元荧光配合物－高碘酸钠体系

Determination of Manganese(Ⅱ)by Fiber Optic Kinetic Method with FIA and Binary Fluorescent Complex Indicator Manganese-Binary Fluorescent Complex-Sodium Periodate

对二元荧光配合物作为动力学反应指示剂的可行性进行了考察，以８－羟基喹啉－５－磺酸铝－高碘酸钠为指示反应，建立起流动注射光导纤维光谱技术测定痕量锰（Ⅱ）的动力学荧光分析新体系。此法线性范围为５～２００ｎｇ／ｍＬ，检出限为１ｎｇ／ｍＬ，对５０ｎｇ／ｍＬ锰（Ⅱ）进行１１次测定的相对标准偏差为０．５％，分析速度为４５样次／ｈ。

Fiber optic has been coupled in the kinetic spectrofluorimetric apparatus with FIA.The feasibility of binary fluorescent complex as a new type of kinetic indicator has been investigated.A new indicating reaction using 8-hydroxyquinoline-5-sulfate aluminium as kinetic fluorescent indicator in Mn-H2QS-NaIO4 system has been developed to determine trace manganese(Ⅱ).The limit of detection is 1 ng/mL and the linear calibration curve is obtained in the range of 5-200 ng/mL manganese(Ⅱ) level and the sampling speed is 45 samples per hour.The proposed method has been applied to determine manganese in teas,mineral and waters.