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中文摘要：
研究发现,PO_4~（3-）在中性条件下抑制Cu~（2-）催化罗丹明内酰胺水解生成强荧光罗丹明B的反应,抑制的程度与PO_4~（3-）的浓度具有线性关系。由此,建立了检测PO_4~（3-）的荧光分光光度法。在pH 7.0的条件下,方法的线性范围为3.0×10~（-6）～4.5×10~（-5）mol/L,相关系数为0.9938,检出限（3σ）为1.6×10~（-7）mol/L。本方法用于人工湿地中PO_4~（3-）的检测,加标回收率为93.0%～108.0%,相对标准偏差小于6.0%。
英文摘要：
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~（-5） mol/L with the correlation coefficient of 0.9938 and the detection limit of 1.6×10~（-7） mol/L（3a）.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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