Composition of standard reference samples of Fe-Mn nodules and bottom sediments

It includes iron-manganese nodules (SDO-4, SDO-5 and SDO-6), ore crusts (SDO-7) diatomaceous ooze (SDO-8), and deep-sea red clays (SDO-9). The standards are intended to serve as a metrologic basis for physical, physicochemical and chemical analyses of iron-manganese minerals and ocean sediments.

The standards are provided with certified analyses of rock-forming components and certain trace elements. Certified characteristics are based on statistical analysis of data obtained from an inter-laboratory experiment involving analysis of the standard reference samples by a variety of methods.