离心光度法测定酒中微量Zn（Ⅱ）的方法研究

Methodological Study on Centrifugal Spectrophotometric Determination of Trace Zinc ions in the Wine

研究一种高灵敏测定酒中微量Ｚｎ（Ⅱ）的新方法──离心光度法．在ｐＨ为１．３０的ＺｎＳＣＮ－ＣＶ三元离子缔合物体系中，λｍａｘ为５９８ｎｍ的表观摩尔吸光系数ε５９８为３．３９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ｚｎ（Ⅱ）在１．５×１０－６～１３．８×１０－６ｍｏｌ·Ｌ－１范围内呈线性关系．

A study is made on centrifugal spectrophotometry as a sensitive new method for determining trace zinc in the wine.In the ternary ionic associate Zn-SCN-CV(pH=1.30)system, molar absorptivityε598 appears to be 3.39×105 L·mol-1·cm-1 at the point where λmax=598 nm.The amount of Zn(Ⅱ)shows a linear relation in the range of 1.50×10-6～13. 8×10-6mol·L-1.The method has been applied to the determination of zinc in the wine with satisfactory result.