Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
Luminescence. 2011 Nov-Dec;26(6):656-61. doi: 10.1002/bio.1292. Epub 2011 Apr 4.
In this paper, a simple and novel method for the determination of polychlorinated biphenyls (PCBs), using silver nanoparticles (AgNPs) as a resonance light scattering (RLS) probe, is proposed. Under optimized conditions, there existed linear relationships between the enhancing RLS intensity of the system and the concentrations of PCBs in the range 8.0 × 10(-8) -1.0 × 10(-6) g mL(-1) for 2,4,4'-trichlorbiphenyl (PCB28), 9.0 × 10(-8) -1.0 × 10(-6) g mL(-1) for 2,2',5,5'-tetrachlorbiphenyl (PCB52) and 4.0 × 10(-8) -1.0 × 10(-6) g mL(-1) for 3,3',4,4'-tetrachlorobiphenyl (PCB77). The corresponding detection limits (S/N = 3) were 2.6 × 10(-8) g mL(-1) for PCB28, 3.3 × 10(-8) g mL(-1) for PCB52 and 6.3 × 10(-9) g mL(-1) for PCB77, respectively. Finally, the mechanism of RLS enhancement was also studied. The results indicated that PCBs were adsorbed on the surface of AgNPs to form larger AgNP-PCB aggregates, resulting in the RLS enhancement of the system.
本文提出了一种利用银纳米粒子（AgNPs）作为共振光散射（RLS）探针测定多氯联苯（PCBs）的简单新颖方法。在优化条件下，该体系的增强 RLS 强度与 PCB 的浓度在 2,4,4'-三氯联苯（PCB28）的 8.0×10^(-8)-1.0×10^(-6) g mL^(-1)、2,2',5,5'-四氯联苯（PCB52）的 9.0×10^(-8)-1.0×10^(-6) g mL^(-1)和 3,3',4,4'-四氯联苯（PCB77）的 4.0×10^(-8)-1.0×10^(-6) g mL^(-1)范围内存在线性关系。相应的检测限（S/N = 3）分别为 PCB28 为 2.6×10^(-8) g mL^(-1)、PCB52 为 3.3×10^(-8) g mL^(-1)和 PCB77 为 6.3×10^(-9) g mL^(-1)。最后，还研究了 RLS 增强的机理。结果表明，PCBs 被吸附在 AgNPs 表面形成更大的 AgNP-PCB 聚集体，导致体系的 RLS 增强。
