摘要
四-(对三甲铵苯基)卟啉,在乙二胺存在下与Zn(Ⅱ)形成络合物,据此提出用分光光度法测定微量锌的方法.该络合物最大吸收波长在425nm.表观摩尔吸光系数为3.42×10~5.锌量在0—4.5μg/25ml范围内遵从比尔定律.研究了共存离子的影响.本法可直接应用于测定面粉中的微量锌.
Based on the formation of the complex of Zn (Ⅱ) with meso-tetrakis (4-trimethylammonium phenyl)porphine in the presence of ethylene-diamine,the spectrophotometric method for the determination of trace Zn (Ⅱ)has been developed. The absorption maximum of the aqueous soluble complex is 425nm and it's apparent molar absorptivity is 4.32×10~5.Beer's law is obeyed for 0 to 4.5μg /25ml of Zn (Ⅱ). The interference of diverse ions has been studied. This method can be applied directly to the determination of trace Zn (Ⅱ)in the flour.
出处
《山东师范大学学报（自然科学版）》
CAS
1990年第4期42-45,共4页
Journal of Shandong Normal University(Natural Science)
