以鞣花酸为荧光探针的水体中二/三价铁离子的检测
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摘要
建立了鞣花酸(EA)测定痕量Fe~(2+)、Fe~(3+)的荧光分析法,并讨论了常见金属离子、甲醇体积分数以及pH值对Fe~(2+)、Fe~(3+)定量检测的影响。实验发现,Fe~(2+)、Fe~(3+)在浓度0.08～1.1μmol/L范围内与EA的荧光猝灭程度呈良好的线性关系,检出限分别为72、63 nmol/L。同时发现酒石酸二铵对Fe~(3+)的掩蔽效果良好。通过Job?s plot得到EA与Fe~(2+)及Fe~(3+)的配位比分别为1∶3和1∶2。采用所建立的方法对自来水与珠江水中的Fe~(2+)、Fe~(3+)进行测定,其加标回收率为81.0%～116%。
A fluorescent analytical method for the detection of trace Fe~(2+) and Fe~(3+) in water was established using ellagic acid(EA) as fluorescent probe.The effects of common metal ions,methanol concentration and pH value of media on the quantitative detection of Fe~(2+) or Fe~(3+) were investigated in detail.Results illustrated that a good linear relationship between the flourescence quenching and the concentrations of Fe~(2+) and Fe~(3+) was obtained within the range of 0.08-1.1 μmol/L with the detection limits of 72 nmol/L and 63 nmol/L,respectively.Meanwhile,Fe~(2+) could be detected accurately without significant interference using 10 mmol/L ammonium tartrate to mask Fe~(3+).In addition,the Job?s plot analysis showed that the coordination ratios for EA to Fe~(2+) or Fe~(3+) were 1 ∶3 and 1 ∶2,respectively.The established method was used in the detection of Fe~(2+) and Fe~(3+) in tap water and Zhujiang River water with average recoveries of 81.0%-116%.
A fluorescent analytical method for the detection of trace Fe~(2+) and Fe~(3+) in water was established using ellagic acid(EA) as fluorescent probe.The effects of common metal ions,methanol concentration and pH value of media on the quantitative detection of Fe~(2+) or Fe~(3+) were investigated in detail.Results illustrated that a good linear relationship between the flourescence quenching and the concentrations of Fe~(2+) and Fe~(3+) was obtained within the range of 0.08-1.1 μmol/L with the detection limits of 72 nmol/L and 63 nmol/L,respectively.Meanwhile,Fe~(2+) could be detected accurately without significant interference using 10 mmol/L ammonium tartrate to mask Fe~(3+).In addition,the Job?s plot analysis showed that the coordination ratios for EA to Fe~(2+) or Fe~(3+) were 1 ∶3 and 1 ∶2,respectively.The established method was used in the detection of Fe~(2+) and Fe~(3+) in tap water and Zhujiang River water with average recoveries of 81.0%-116%.
引文
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