In early tests with the ligand 2-(2-Thiazolylazo)-p-cresol (TAC), we found that interference of the Fe(TAC) 1 complex may have competed with Fe(TAC) 2 for Fe. Also, i pmax was not reached in UV treated seawater after overnight equilibration ([TAC] = 40 Î¼ m, Î± Fe 3 + (TAC) 2 = 3.6 Ã 10 13).
BASE UNIT - kilogram (kg) - MASS. The standard for the kilogram is a cylinder of platinum-iridium alloy kept by the International Bureau of Weights and Measures in Paris. A duplicate at the National Bureau of Standards serves as the mass standard for the United States.
The kilogram or kilogramme is the base unit of mass in the International System of Units, and is defined as being equal to the mass of the International Prototype of the Kilogram, a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France. It is the only metric base unit which is defined by an artifact. The kilogram was originally defined as the mass of a litre of water at the freezing point. That was an inconvenient quantity to precise