Via several techniques to modify sensitive matrix for inhabiting the leakage of fluorescent indicator, a new stable sensing material for monitoring phosphates has been prepared and applied to the measurement of phosph...Via several techniques to modify sensitive matrix for inhabiting the leakage of fluorescent indicator, a new stable sensing material for monitoring phosphates has been prepared and applied to the measurement of phosphates in artificial seawater. It is based on the reaction of PO 3- 4 with Al(Ⅲ) Morin that leads to the fluorescence quenching of the composite matrix. At pH value 4 0 and the salinity value 25 0, the response time of output signal having reached the steady state is less than 300 seconds. Its calibration graph is gained in the range of H 2PO - 4 mass concentration from 1 50 to 7 00 μg/mL with the limit of detection(3 σ/K ) 0 02 μg/mL. When it was used to measure phosphates in artificial seawater, the recovery ranged from 96 78% to 102 09%. Being stored under the proper condition, the membranes maintain sensitive for 90-120 days, and are able to be used for 50-80 times with indicator supplement.展开更多
基金Supported by the Foundation for U niversity Key Teacher by the MOE,Natural Science Foundation of Fujian Provinceof China(No.D9910 0 0 9) and Three Projects of Science and Technology of Fujian Province(No.K990 37) .
文摘Via several techniques to modify sensitive matrix for inhabiting the leakage of fluorescent indicator, a new stable sensing material for monitoring phosphates has been prepared and applied to the measurement of phosphates in artificial seawater. It is based on the reaction of PO 3- 4 with Al(Ⅲ) Morin that leads to the fluorescence quenching of the composite matrix. At pH value 4 0 and the salinity value 25 0, the response time of output signal having reached the steady state is less than 300 seconds. Its calibration graph is gained in the range of H 2PO - 4 mass concentration from 1 50 to 7 00 μg/mL with the limit of detection(3 σ/K ) 0 02 μg/mL. When it was used to measure phosphates in artificial seawater, the recovery ranged from 96 78% to 102 09%. Being stored under the proper condition, the membranes maintain sensitive for 90-120 days, and are able to be used for 50-80 times with indicator supplement.
