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1 µg / mcg = 0.000035 oz wt.
1 oz wt. = 28,349.52 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 ounce of water provided by TheFreeDictionary
A fluid ounce is a unit of volume (also called capacity) typically used for measuring liquids. Whilst various definitions have been used throughout history, two remain in common use: the imperial and the United States customary fluid ounce. An imperial fluid ounce is 1/20 of an imperial pint, 1/160 of an imperial gallon or approximately 28.4 ml. A US fluid ounce is 1/16 of a US fluid pint, 1/128 of a US liquid gallon or approximately 29.6 ml.