Chemical monitoring legal requirements

As in all chemical engineering, a major trend has been towards the complete utilization of all raw materials and energy and, for example, all heat from exothermic reactions or Joule heating is used elsewhere in the plant. Moreover the plants have had to change in order to comply with the legal requirement to monitor and control emissions of possible pollutants in the chlor-alkali industry the major concerns have been mercury and chlorine itself. Normally both the atmosphere and the effluent will be monitored for Hg and CI2 and the hazards have been much reduced. 

Employees who are exposed to nanoaerosols should have adequate protection against nanoparticle exposure. The best option is exhaust by hood conventional dust masks may not be as effective as expected. At this moment, there is no legal standard that sets the occupational exposure threshold. The development of risk assessment of exposure to nanoaerosol has been limited by the lack of standard methods and compact instrumentation for long-term monitoring. Accurate risk assessment requires advanced nanoaerosol sampling and characterization techniques for the analysis of both physical and chemical properties of nanoaerosol. 

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