Barrier approach chemical agent

The European directive on the protection from chemical hazards illustrates a more systematic approach in the application of the barrier philosophy to prevent occupational accidents and diseases (European Council, 1998). To prevent workers from being exposed to hazardous chemical agents, the employer must take actions in a priority from left to right according to Figure 7.2. 

In order to improve the process and get shortening of experimental times, applied efforts have covered a wide set of conditions. Some examples of reported research have addressed for modifying pH and current density (Hamed Bhadra, 1997), chemical conditioning of electrode wells (Reed et al, 1995 Murillo-Rivera et al, 2009), cation inclusion (CoUeta et al, 1997), as well as addition of complexing (Yeung et al, 1996) and lixiviant agents (Cox et al 1996) another approach has been the inclusion of reactive barriers into the soil matrix (Cundy Hopkinson, 2005 Ruiz et al, 2011). 

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