Commonly used solvents for extracti

Commonly used solvents for extraction are dichloromethane [10], ethers and carbon disulfide [11–14]. Although LLE is relatively sim- ple and inexpensive, it has many drawbacks, among them the need to use large quantities of solvents. In order to achieve the desired enrichment factor, the excess solvent requires removal by evapora- tion, and extract cleanup may also be necessary. Additionally, there is a risk of emulsions forming during agitation. This technique is useful for extracting empty containers and for small samples [15].