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首页> 外文期刊>Journal of the Indian Chemical Society >Ligand sensitized fluorescence of uranyl in its fluoride complex by picolinic acid: An application for trace fluoride ion determination
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Ligand sensitized fluorescence of uranyl in its fluoride complex by picolinic acid: An application for trace fluoride ion determination

机译:吡啶甲酸对铀酰在氟络合物中的配体敏化荧光:在痕量氟离子测定中的应用

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摘要

Picolinic acid has been used to form complex with uranyl fluoride to enhance the fluorescence intensity by about two times. Linearity in fluorescence intensity of uranyl-fluoride-picolinau complex was obtained in the range of fluoride concentration of 40-400 ppb. The quenching effect of ions like Cr~-NO3~-, SO4~(2-), CO3~(2-) and Fe~(2+) on the fluorescence intensity of uranyl-fluoride and uranyl-fluoride-picolinafe complexes have been studied. Stern-Volmer quenching constants for these quenchers were found to be about five times less in uranyl-fluoride-picolinate complex as compared to uranyl-fluoride complex. Fe~(2+) ion is found to have severe quenching effects on the fluorescence intensity of both the complexes of uranyl. This method can be used for determination of trace amount of fluoride in water samples with the tolerance limits of NO3~-(20 ppm), SO4~(2-) (60 ppm), CO3~(2-) (100 ppm) and CI~-(2 ppm).
机译:吡啶甲酸已用于与铀酰氟形成络合物,以将荧光强度提高约两倍。在40-400 ppb的氟化物浓度范围内,获得了铀酰-氟化物-picolinau复合物的荧光强度线性关系。 Cr〜-NO3〜-,SO4〜(2-),CO3〜(2-)和Fe〜(2+)等离子对铀酰氟和铀酰氟-吡啶甲酸络合物的荧光强度具有猝灭作用研究。发现这些淬灭剂的Stern-Volmer淬灭常数在铀酰-氟化物-吡啶甲酸络合物中比铀酰-氟化物络合物少约五倍。发现Fe〜(2+)离子对两种铀酰复合物的荧光强度都有严重的猝灭作用。该方法可用于水样中痕量氟化物的测定,其公差极限为NO3〜-(20 ppm),SO4〜(2-)(60 ppm),CO3〜(2-)(100 ppm)和CI〜-(2 ppm)。

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