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.
出处
《食品研究与开发》
CAS
北大核心
2010年第2期147-150,共4页
Food Research and Development
关键词
析相光度法
锌
PAN
the phase separation-spectrophotometry
zinc
PAN
