Fluorescence sensing of phosdrin pesticide by the luminescent Eu(III)- and Tb(III)-bis(coumarin-3-carboxylic acid) probes
作者:Belal H.M. Hussein、Gasser M. Khairy、Rasha M. Kamel
DOI:10.1016/j.saa.2016.01.008
日期:2016.4
Luminescence quenching of the Eu(III)- and Tb(III)-bis (coumarin-3-carboxylic acid) (Ln(III)-(CCA)2) probes has been studied in the presence of organophosphorus or organochlorine pesticides; Phosdrin (P1), Malathion (P2), Profenofos (P3), Formothion (P4), Heptachlor (P5), and Endosulfan (P6). The luminescence intensity of lanthanide complex probes Ln(III)-(CCA)2 decreases as the concentration of the
在有机磷或有机氯农药存在下,研究了Eu(III)-和Tb(III)-双(香豆素-3-羧酸)(Ln(III)-(CCA)2)探针的发光猝灭;磷精(P1),马拉硫磷(P2),普罗芬诺斯(P3),甲硫磷(P4),七氯(P5)和硫丹(P6)。镧系元素复合探针Ln(III)-(CCA)2的发光强度随磷蛋白农药浓度的增加而降低,而其他研究农药对镧系元素荧光强度没有显着影响。可以看出,根据Stern-Volmer图,通过静态淬灭过程,磷精对Eu(III)和Tb(III)-香豆素-3-羧酸的淬灭过程得以进行。确定了Ln(III)-(CCA)2与磷精相互作用的结合常数(K)和热力学参数。基于Ln(III)-(CCA)2-磷精蛋白三元配合物的发光变化,开发了一种直接测定乙醇中磷精的方法。P1的检出限Eu(III)和Tb(III)配合物分别为6.28和1.07μM。已经研究了各种干扰物质对P1检测的影响,以评估