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1 g wt. = 1,000.00 µg / mcg
1 µg / mcg = 0.001 g wt.
Definition of grams of water provided by Dictionary.com
The basic unit of measurement for mass in the metric system; one cubic centimeter of water has a mass of approximately one gram.
Definition of micro-gram 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).