Laboratory equipment such as atomic spectrometric methods for heavy metal detection requires complex preparation, high cost and specialized laboratory and personnel. Electrochemical technique has relied on mercury-based electrodes. Mercury toxicity severely limits its application. Substitutions with disposable, robust, sensitive, and cost effective electrode by means of CME, glassy-carbon electrode (GCE) or SPE (screen printed carbon electrode) are other that present many advantages for in-situ trace determinations of heavy metal ions.  There are concerns related to long-term stability, befouling, the requisite for recalibration and renewal of the sensors in combination with the typical need of low detection limits. Selection of suitable sensing material and process optimization have to be carried out and validated to allow for reproducible and reliable analyses.