Four laboratories collaborated on the trace element analysis of sea water samples obtained on the 1969 Geosecs test cruise in the northeast Pacific Ocean. The elements determined were Sr, Cs, Rb, Co, Ni, Sc, Cu, Sb, Zn, Fe, and U. Two or more laboratories reported on Sr, Cs, Zn, Fe, and U. The general agreement was good. Depth variations were noted for some elements. Acidified samples were higher in Fe, Zn, and Co than the unacidified samples. Except for surface iron values, filtering had no effect on concentration.

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