析相光度法测定食品中微量锌的研究  

Study on the Determination of Trace Zinc by the Phase Separation-Spectrophotometry

作　　者：周长智[1] 陈守杰[1] 李建伟[1] 

机构地区：[1]河南工业大学化学化工学院,河南郑州450052

出　　处：《食品研究与开发》2010年第2期147-150,共4页Food Research and Development

摘　　要：研究Zn(Ⅱ)-PAN-OP体系的析相光度法。在pH9.5Na2B4O7-NaOH介质中,Zn(Ⅱ)-PAN-OP胶束溶液在85℃下加热30min,配合物即被OP乳化剂完全富集,其最大吸收波长为556nm,Zn(Ⅱ)含量在0～0.12mg/L内服从比尔定律,相关系数为R2=0.9993,表观摩尔吸光系数ε=5.23×105L(/mol·cm)。方法应用于食品中锌的测定,结果令人满意。The optimum condition of the phase-separation colouring reaction of Zn（ II ） with PAN in the presence of OP are studied. In pH 9.5 buffer medium,the complex can be enriched in OP phase by heating for 30 min at 95℃. The maximum absorption of the complex lies at 556 nm. Beer＇s law is obeyed within 0-0.12 mg/L Zn （ II ） with apparent molar absorptivity of 5.23×10^5L/（mol·cm）. The proposed method has been applied to the determination of trace zinc in food samples with satisfactory results.

关 键 词：析相光度法 锌 PAN 

分 类 号：TS207.3[轻工技术与工程—食品科学] TQ153.2[轻工技术与工程—食品科学与工程]