This project will upgrade instrumentation in the Trace Metals Laboratory at Moss Landing Marine Laboratories. The Trace Metals Lab of MLML has been a world leader in studies of the role of metals in regulating primary production in the ocean over large spatial and temporal scales. Moss Landing scientists have played a major part in developing new analytical methods for trace elements in aquatic systems. They have also played a key role in making freshwater chemists aware that there are significant methodological errors in previous measurements of metals in freshwater systems. As a result, MLML has served as an important center for training and development of analytical methods for trace chemical analysis. In the past 5 years,6 graduate students have finished MS degrees working with Trace Metals Lab staff and instrumentation. In addition, there have been a number of visitors to the lab from the US and overseas.