Hi.
I'm doing some work on arsenic speciation. I am following a paper titled, "SPECIATION OF ARSENIC IN A CONTAMINATED SOIL BY SOLVENT EXTRACTION." which calls for the use of chloroform or benzene to extract arsenic trichloride from a hydrochloric acid solution. The paper states that other solvents can also be used but does not go into detail.
I am looking for a safer alternative to chloroform or benzene. Can anyone make a suggestion please?
Thank you.
Arsenic(III), as arsenic trichloride, was selectively extracted into chloroform from a solution highly concentrated in hydrochloric acid. https://www.sciencedirect.com/science/article/pii/003991409501395R
Arsenic was extracted most efficiently by 5% H3PO4 with a maximum of more than 99% from the model soil. Sulfuric acid also showed high percentage extraction efficiency. On the other hand, C2H4O2 and oxidizing acids such as HNO3 and HClO4 showed low efficiency of As extraction compared with C6H8O7. https://www.tandfonline.com/doi/full/10.1080/10934520600575036?src=recsys
Hydrochloric acid extractions were used as a method for removal of the arsenic from the soil in a form suitable for speciation. https://pubmed.ncbi.nlm.nih.gov/18966233/
Arsenic present in freeze-dried carrots was extracted using accelerated solvent extraction (ASE). Several parameters, including selection of the dispersing agent, extraction time, number of extraction cycles, particle size and extraction temperature, were evaluated to optimize the ASE method. https://pubs.rsc.org/en/content/articlelanding/2001/an/b102420p#
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