SAFETY

LST has undergone a comprehensive toxicity assessment which has shown it to be of low acute toxicity.

Unlike the organic heavy liquids, LST is not an irritant through inhalation, skin absorption or swallowing. However, water proof gloves should be worn during the use of LST. LST solids are an eye hazard because of their irritancy when allowed to remain in contact with the eyes, and eye protection is required when using LST heavy liquid. The lack of vapour pressure for LST means that there is no noxious smells and so restrictive use in expensive fume hoods is not required and it does not pose a potential fire hazard.

For further information on safety aspects of LST you can consult the Material Safety Data Sheet (MSDS).

 

USING LST

LST heavy liquids can be stored indefinately in closed plastic or glass containers. The LST heavy liquid has a pH of approximately 4. As a consequence LST should not come into contact with metal equipment which can rust, such as iron. Metals such as stainless steel were found to be suitable for short term work.

The maximum density which an LST heavy liquid can potentially reach will depend on the temperature at which it is to be used. At 25 ºC the upper limit of density is 2.96 g/mL. However, to use the liquid at this density would invite problems from crystallisation of LST solids (caused by evaporation or local problems) and higher solution viscosities. A more practical and useful heavy liquid is obtained at a density of 2.85 g/mL, a density similar to that obtained from bromoform. At elevated temperatures densities up to 3.5 g/mL possible (Figure 3). As LST is water soluble, the density may be varied by diluting with water, or concentrating to remove water.

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