Review in the analysis of hazardous material in work place by trends in the Dispersive liquid–liquid microextraction method

Dispersive liquid-liquid microextraction (DLLME) is a recent microextraction technique that was first developed by Assadi and et al. in 2006. This method is a very popular and benign sample-preparation technique. Fast, cost benefit, easy and fast operation, low consumption of organic solvents, high enrichment factor and short extraction time are the advantages of this technique. Simultaneous extraction and preconcentration of analytes in to a micro-volume of extraction solvent is based on a ternary solvent system. Extraction solvent must be non polar, water immiscible and usually have higher density than water. Being polar and water miscible is often considered as a necessary feature for the disperser solvent. The present review study, aims at introducing basic principles of DLLME method, parameters affecting the extraction efficiency and finally evaluating the application of DLLME method in extraction hazardous material in work place.