共振瑞利散射光谱法同时测定α-萘酚和β-萘酚异构体  

Simultaneous Determination of α-naphthol and β-naphthol with Resonance Rayleigh Scattering Spectrometry

作　　者：杨季冬[1] 

机构地区：[1]长江师范学院化学系,重庆涪陵408100

出　　处：《化学通报》2008年第7期539-544,共6页Chemistry

基　　金：国家自然科学基金项目(20475045);重庆市教委科研项目(KJ051303)资助

摘　　要：在硼砂-HCl（pH=8.2）的水溶液中,α-萘酚（α-N）和β-萘酚（β-N）分别与β-环糊精（β-CD）形成包合物,对共振瑞利散射光谱（RRS）有很强的增敏作用。实验发现,α-N和β-N两种包合物的RRS光谱在320nm处有等强度的等散射点,β-N的包合物在338nm处出现一个突出尖峰,经偏振实验证实是共振荧光峰,而两者在470nm处的共振瑞利散射峰形和增强趋势一致,且具加和性。故可在470nm处测定萘酚的总量,再在338nm处以＂同原射线计量法＂测定β-N和α-N的含量。在470nm处测定萘酚总量实验的线性范围为5.0×10^-6 - 3.6×10^-4mol/L,最低检出限为2.0×10^-6mol/L,RSD为3.5%。在338nm处测定β-N和α-N含量的线性范围均为5.0×10^-6 - 3.1×10^-4mol/L,最低检出限分别为1.6×10^-6mol/L和1.8×10^-6mol/L,RSD分别为3.7%和3.6%。测定的选择性较好,据此可对合成样品进行同时测定和对α-萘酚试剂的纯度分析,结果令人满意。The inclusion compounds were formed of α-naphthol and β-naphthol with β-cyclodextrin in the buffer solution of Na2 B4 O5-HCl at pH 8.2, and the resonance Rayleigh scattering （RRS） spectral intensity was enhanced in the two systems. It was found that an equal intensity point of RRS of a-naphthol andβ-naphthol is at 320nm, a narrow pinnacle was found in the spectrum of β-naphthol at 338nm. The intensity at 470nm of spectra of α-naphthol and β-naphthol is accordant in enhanced direction and with additive property. So the total content of naphthol in the solution can be determined through the intensity at 470nm, the content of β-naphthol and a-naphthol can be determined at 338nm by measurement analysis of the two working curve with one same point respectively. At 470nm, the calibration curve was linear in the range of 5.0 × 10^-6 - 3.1 × 10^-4 mol/L; the detection limit was 1.7 × 10^-6 mol/L; RSD was 3.5 % . At 338 nm, the calibration curve forβ-naphthol and a-naphthol were linear in the range of 5.0 ×10^-6 - 3.1 × 10^-4 mol/L; the detection limits were 2.1 × 10^-6mol/L and 1.8 × 10^-6mol/L; RSD were 3.7% and 3.6%, respectively. The method has good selectivity and has been applied to simultaneous analysis of synthetic samples and purity analysis of α-naphthol with satisfactory results.

关 键 词：共振瑞利散射光谱 Α-萘酚 Β-萘酚 Β-CD 同时测定 

分 类 号：O657.3[理学—分析化学]