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A nanogram gravimetric sensor for orthophosphate ions in aqueous solution was constructed based on surface adsorption of orthophosphate ions on insoluble orthophosphate salts, such as CePO 4 , CrPO 4 and BiPO 4 , immobilized on the electrodes of a quartz-crystal microbalance (QCM). The mass change caused by the selective adsorption of orthophosphate ion on solid/ aqueous interfaces...
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