Calcinated and acidified clay modified carbon graphite electrode was deployed in the simultaneous evaluation of traces of Pb²⁺ and Cd²⁺ in solution. After 5 minutes of accumulation in the circuit, the sensitivity of the electrode was evaluated in a solution of Na₂SO₄ (0.1 M) by square wave voltammetry on the one hand with Pb (II) and on the other hand with Cd (II). Several experimental conditions such as the composition of the carbon clay paste, the effect of preconcentration time, the sweeping speed, concentration effect, media pH, and interference ionic response to the electrochemical response of the working electrode were examined. It was observed that, after 5 minutes of preconcentration, detection limits of 0.15513 μmol·L⁻¹ and 0.24227 μmol·L⁻¹ were obtained for Pb²⁺ and Cd²⁺ in the electrolyte solution and 0.08438 μmol·L⁻¹ and 0.46522 μmol·L⁻¹, respectively, when tap water was used. The detection was effective by square wave voltammetry with a more intense current density with respect to lead.

中文翻译：

---

活性粘土改性碳糊电极同时电化学检测铅和镉

煅烧酸化粘土改性碳石墨电极用于同时评价溶液中痕量Pb ²⁺和Cd ²⁺。在电路中累积 5 分钟后，通过方波伏安法在 Na ₂ SO ₄ (0.1 M) 溶液中评估电极的灵敏度，一方面与 Pb (II)，另一方面与 Cd (II ）。考察了几种实验条件，如碳粘土糊的组成、预浓缩时间的影响、扫描速度、浓缩效应、介质 pH 值以及干扰离子响应对工作电极电化学响应的影响。据观察，预浓缩 5 分钟后，检测限为 0.15513 电解液中 的Pb ²⁺和Cd ^2+分别为μ mol·L ^-1和 0.24227  μ mol·L ^-1，自来水时分别为0.08438 μ mol·L ^-1和0.46522 μ mol·L ^-1 。被使用了。方波伏安法的检测是有效的，对于铅具有更强的电流密度。