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1 µg / mcg = 0.00000000098 tn long wt.
1 tn long wt. = 1,016,046,908.80 µg / mcg
Definition of micro-grams of water provided by SMARTe.org
Concentrations of chemicals in water are typically measured in units of the mass of chemical (milligrams, mg or micrograms, ug) per volume of water (liter, L, l).
Definition of U.K. long ton of water provided by WikiPedia
The long ton arises from the traditional British measurement system: A long ton is 20 hundredweight, each of which is 8 stone, which is defined as 14 pounds. Thus a long ton is 20 × 8 × 14 lb = 2,240 lb.