Citation:
YANG Hui, ZHENG Lin-Ling, LI Yuan-Fang, HUANG Cheng-Zhi. Rhodamine Spirolactam and Copper Ion-based Fluorometric Detection of Phosphate in Artificial Wetlands[J]. Chinese Journal of Analytical Chemistry,
;2012, 40(11): 1715-1719.
doi:
10.3724/SP.J.1096.2012.20110
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Under neutral condition, phosphate ions could inhibit the catalytic effect of copper ions on the hydrolysis of rhodamine spirolactam to form fluorescent rhodamine B, resulting in the decrease of fluorescent intensity. Moreover, the inhibitive degree was in proportional to the concentration of phosphate ions, which could be developed for sensing phosphate. In the buffer (pH 7.0) solution, phosphate ions could be determined in the range of 3.0×10-6-4.5×10-5mol/L with the correlation coefficient of 0.9938 and the detection limit of 1.6×10-7 mol/L (3σ). This method was applied to the detection of phosphate in artificial wetlands with the recovery from 93.0% to 108.0% and the RSD lower than 6.0%.
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