干扰元素能被选择性滴定剂所避免。
考察了振荡平衡时间（或流速），水相的酸度和干扰元素的影响。
The effects of oscillation equilibrium time (or flow—rate), pH of aqueous phase and the foreign ions on the extraction were examined.
优选出最佳的测量波长，研究了酸度、显色剂浓度及干扰元素对测定的影响。
Optimum measuring wavelength was selected. The effect of acidity, concentration of chromogenic agent, and interfering elements on the measurement was studied.
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