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Mercury-free PSA of heavy metals using graphite-epoxy composite electrodes

机译：使用石墨-环氧复合电极的重金属无汞PSA

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A potentiometric stripping analysis (PSA) of heavy metals based on a graphite-epoxy composite electrode without surface modification and also without the traditional use of mercury is presented. The graphite-epoxy electrode was used as working electrode in the determination of lead, copper and cadmium in a concentration range from 250 to 2000 ppb. Results for lead determination show the advantages offered by a graphite-epoxy composite as an alternative to mercury-modified carbon electrodes. Advantages include the elimination of the use of environmental harmful mercury or other kind of modifiers while offering a similar sensitivity and repeatability. The limit of detection (LoD) for lead is approximately 200 ppb, with an accumulation time of 60 s. The use of longer deposition times show an increase of peak height and hence a greater sensitivity and a lower LoD. For practical application however it is essential to reach a compromise between sensitivity, LoD and length of analysis time. [References: 25]
机译：提出了一种基于石墨-环氧复合电极的重金属电位剥离分析法（PSA），该方法无需进行表面修饰，也无需传统使用汞。石墨环氧电极用作测定铅，铜和镉的工作电极，其浓度范围为250至2000 ppb。铅的测定结果表明，石墨-环氧复合材料具有替代汞改性碳电极的优势。优点包括消除对环境有害的汞或其他种类的改性剂的使用，同时提供相似的灵敏度和可重复性。铅的检出限（LoD）约为200 ppb，累积时间为60 s。使用较长的沉积时间会显示峰高增加，因此灵敏度更高，LoD更低。但是对于实际应用，必须在灵敏度，LoD和分析时间长度之间取得折衷。 [参考：25]

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