丁基萘磺酸钠水溶液的三维荧光特性

三维荧光光谱技术是新型高效的化学分析方法，在水环境领域的应用日益广泛，但存在水溶液中污染物的荧光信息缺乏的瓶颈。以有毒污染物丁基萘磺酸钠为例研究了其水溶液的三维荧光特征。结果表明，该溶液存在4个荧光峰，分别位于激发波长/发射波长为230/340，280/340，225/650和280/650 nm处。除225/650 nm处之外其余三个荧光峰的荧光强度均随着浓度增加而增大;而225/650 nm处的荧光强度在浓度低于0.5 mg·L-1时，随着浓度增加而增大，大于0.5 mg·L-1时则随着浓度增加而减小。pH对荧光峰的位置影响不明显，但会改变峰强度。pH为2～10时荧光特征比较稳定。荧光法直接测定水环境中丁基萘磺酸钠是可行的。测量可以采用280/340 nm作为测量波长，线性浓度范围为0～0.033 3 mg·L-1。这种简便快速的方法不需要进行复杂的样品前处理，结果可靠。

Three-Dimensional Fluorescence Properties of Sodium Butyl Naphthalene Sulfonate in Aqueous Solution

Three-dimensional fluorescence spectroscopy is a new and effective chemical analysis method and is employed in water environment more and more widely. But the utilization is limited by the bottleneck, i.e. shortage of fluorescence data of contaminants in aqueous solution. This paper presents the three-dimensional fluorescence properties of a toxic contaminant, sodium butyl naphthalene sulfonate, in aqueous solution. There existed four peaks at about λ_ex/em=230/340, 280/340, 225/650 and 280/650 nm respectively. The intensity of all the peaks except the peak at 225/650 nm increased as the concentration augmented, while the intensity of peak at 225/650 nm increased as the concentration augmented when the concentration was less than 0.5 mg·L-1, and decreased as the concentration augmented when the concentration was greater than 0.5 mg·L-1. The pH would lead to the variation in the fluorescence intensity vary rather than to change the peak location. The fluorescence intensities were stable when pH was in the range of 2～10. The study indicates that it is feasible to measure sodium butyl naphthalene sulfonate directly with the fluorescence intensity at 280/340 nm. The linear range is between 0 and 0.033 3 mg·L-1. This simple and rapid method could provide reliable results without complex pretreatment.