碱性二苯基萘基甲烷染料共振瑞利散射法测定藻酸钠  

Determination of Sodium Alginate with Basic Bisphenylnaphthylmethane Dyes by Resonance Rayleigh Scattering

作　　者：杨季冬[1,2] 王祥洪[1,2] 刘忠芳[1] 孔玲[1] 刘绍璞[1] 

机构地区：[1]西南大学化学化工学院,重庆400715 [2]涪陵师范学院,重庆

出　　处：《应用化学》2008年第4期385-390,共6页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(20475045);重庆市教委资助项目(KJ051303)

摘　　要：在BR缓冲溶液中，藻酸钠（SA）能与某些碱性二苯基萘基甲烷染料如维多利亚蓝4R（VB4-R）、维多利亚蓝B（VBB）和夜蓝（NB）结合，而使共振瑞利散射（RRS）急剧增强并产生新的RRS光谱。藻酸钠质量浓度为0．085～4．0mg／L（维多利亚蓝4R体系）、0．075～3．0mg／L（维多利亚蓝B体系）、0．13～3．0mg／L（夜蓝体系）时与散射强度呈直线关系。方法具有较高的灵敏度，其检出限（3σ）分别为22．0×10^-9g／mL（VB4R—SA体系），25．6×10^-9g,／mL（VBB—SA体系）和37．5×10^-9g／mL（NB—SA体系）。其中以维多利亚蓝4R体系最为灵敏．并以其为例研究了共存物质的影响。结果表明，方法选择性好。用于面条和海带提取液中藻酸钠的测定．结果满意。In a Britton-Robinson buffer solution （ pH 4. 0 - 5.2） , sodium alginate （SA） can be bound with some basic bisphenylnaphthylmethane dyes such as Victoria blue 4R （VB4R） , Victoria blue B （VBB） , or night blue （NB） to form a new product, resulting in a significant enhancement of Resonance Rayleigh Scattering（RRS） and the appearance of a new RRS spectrum. The RRS intensity was directly proportional to the SA concentration in a range of 0. 075 - 4. 0 mg/L for all the systems, which showed that the method has a fairly high sensitivity. The detection limits of SA（3σ） were 22.0 × 10^-9 g/mL for VB4R-SA system, 25.6 × 10^-9 g/mL for VBB-SA system, and 37.5 × 10^-9 g/mL for NB-SA system, respectively. The VB4R system exhibited the highest sensitivity, for which the effects of coexisting substances were investigated, and the result showed that the method had a good selectivity. This method was applied to determination of trace amounts of SA in noodle samples and kelp extract with satisfactory results.

关 键 词：藻酸钠 碱性二苯基萘基甲烷染料 共振瑞利散射 

分 类 号：O657.3[理学—分析化学]