Calcium-doped lanthanum cobaltite-based electrochemical sensor for the sensitive detection of salicylic acid in real samples: pond water and acne gels

delivers a better structural stability and better catalytic activity for the perovskite. LCCO/GCE with its excellent catalytic activity could detect SA with a limit of detection (LOD) of 30 nM and a linear range of 0.05-800 μM. The fabricated sensor is reproducible with a relative standard deviation (RSD) of less than 1% and is stable up to 30 days with less than 5% variation from the initial current value. The sensor is also selective in sensing SA, even in the presence of a hundred-fold concentration of other interferents. In addition, the real-world applicability of the sensor is investigated in pond water and acne gels, which both give excellent recovery percentages.