在NaOH溶液中,苯唑西林(OXA)能与某些碱性三苯甲烷染料如甲基紫(MV)、乙基紫(EV)和孔雀石绿(MG)结合,使体系的共振瑞利散射(RRS)急剧增强并产生新的RRS光谱,最大共振光散射峰分别位于333nm(MV体系),342nm(EV体系)和343nm(MG体系),苯唑西林的质量浓度在0.080～0.60mg/L(MV体系),0.040～0.40mg/L (EV体系和MG体系)时与散射强度呈良好的线性关系,检出限(3σ)分别为0.064mg/L(MV体系)、0.024mg/L(EV体系)和0.013 mg/L(MG体系),其中以孔雀石绿体系最灵敏,以其为例考察了共存物质的影响.结果表明,方法具有较高的选择性,用于人血清、人尿及市售药物中苯唑西林的测定,结果满意.
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