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Sodium polytungstate - finding a source for it in the USA
Hi all,
I am trying to find a source for SPT in the USA that will not break the bank! The quotes from Fisher were expensive for a very small quantity. When in Europe I would get it from Sometu (1kg powder) for c.$400, and I was wondering where people source SPT from in the UA.
Many thanks
Jennifer
Hi Jennifer,
All heavy liquids have increased significantly in price in the USA over the past 5 years. I most often use lithium metatungstate (LMT). In my opinion, it produces a much cleaner separation than SPT for many soil types, is more stable, and is easier to recycle. Here is my source: https://www.lmtliquid.com/price-and-order-information.html
Chad Yost
Hi Chad,
Does this product you indicate present any toxicity problem? Is there a need for protective equipment and an exhaust hood during the use?
Marcia Calegari
Hi Marcia,
LMT is just as safe and perhaps safer than STP. It is odorless and does not require a fume hood. Only standard lab PPE is advised (gloves, eye protection). However, when mixing dry powders you should use a fume hood. I always purchase it in liquid form. Since tungsten is a heavy metal, you should put any rinsate you do not want to recycle into a waste container for disposal (as you would for any heavy liquid).
Chad
Thanks Chad!
