合成色素及铅砷铜的极谱测定法

Determination of Synthetic Coliours,Lead,Copper and Arsenic by Oscillopolarography

合成色素在乙二胺—硫氰酸钾的不同 pH 溶液中有良好的极谱波。其中 pH13时笕莱红、日落黄、胭脂红分别在-0.45,-0.49,-0.57V(vs.SCE,下同)出峰,PH10时柠檬黄在-0.49V 出峰,亮蓝在 pH3时于-0.38V 出峰,线性范围为5—100μg。在此底液基础上分别加入碘化钾、亚膏酸盐,可连续测定铜(-3.2V)、铅(-0.43V)、砷(-0.49V),铜、铅在0.2～10.0μg 范围、砷在0.1～4μg 范围内与峰电流呈线性关系。

Synthetic colours such as amaranth,sunset yellow,ponceau, tartrazine and brilliant blue.give different polarographic waves in the system of ethyl diamine and potassium thiocyanate and can be determined separately at different pH.The linear range is 5— 100μg for all the colours.With the addition of potassium iodide and Te (Ⅳ) to the system,copper,lead and arsenic give peaks at- 0.32,—0.43 and—0.49 v (vs.SCE) respectively,and the linear ranges are 0.2—10μg for Cu,Pb and 0.1—4.0 ug for As.