盐酸左氧氟沙星分子中含有弱酸性有机胺结构，可与Zn(SCN)₄^2-形成离子缔合物沉淀. 将沉淀分离溶解后，用差示脉冲溶出伏安法在原位形成铋膜电极上测定沉淀中锌(II)的含量，间接测定盐酸左氧氟沙星的含量，结果表明，采用铋膜电极伏安曲线峰形好、灵敏度高、峰电流值大，方法的线性回归方程为I = 1.1401c - 0.5309，相关系数R = 0.9979，线性范围为5.0 ~ 60 μg·mL^-1，检出限为3.18×10^-5 μg·mL^-1，回收率为95% ~ 101%，相对标准偏差RSD = 2.87%.

In this study, differential pulse stripping voltammetry was developed for the quantitative detection of levofloxacin hydrochloride indirectly. Levofloxacin hydrochloride contains organic amine, which can be precipitated upon interaction with Zn(SCN)₄^2-. By means of differential pulse stripping voltammetry, the concentration of Zn²⁺ can be determined using an in-situ formed bismuth film electrode, which allows determining indirectly the amount of levofloxacine hydrochloride. The linearity equation, I = 1.1401c - 0.5309 with the correlative coefficient R = 0.9979, was presented in the experiment. The results showed that this approach is very sensitive, having a limitation of detection of 3.18 × 10^-5 μg·mL^-1 in a linearity range of 5.0 ~ 60 μg·mL^-1.