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1 October 2017 A Recycling Method for LST® Contaminated During Heavy Liquid Separation in Palynological Processing
Brandon G. Van Ness, Morgan K. Black, Clayton R. Gullett, Jennifer M.K. O'Keefe
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Abstract

An aqueous solution of LST® is one of many heavy liquids used to concentrate palynomorphs. It and aqueous solutions of sodium polytungstate (SPT) are replacing toxic heavy liquids, such as bromoform and zinc bromide, and to a lesser extent zinc chloride, in many palynology laboratories. Both non-toxic heavy liquids can be recycled through filtering and evaporation of water and/or ethanol added to the sample during processing, and commonly are. Both media, and especially LST®, are somewhat reactive with organic matter, and in humic-acid rich samples become contaminated and discoloured. This paper presents the authors' methods for recycling LST® and removing contamination through a combination of filtration through activated charcoal and 0.45 µm nylon membranes. Filtration through Celite® was found to be unnecessary.

© 2016 AASP — The Palynological Society
Brandon G. Van Ness, Morgan K. Black, Clayton R. Gullett, and Jennifer M.K. O'Keefe "A Recycling Method for LST® Contaminated During Heavy Liquid Separation in Palynological Processing," Palynology 41(4), 498-503, (1 October 2017). https://doi.org/10.1080/01916122.2017.1283368
Published: 1 October 2017
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