The chemical analyses required for this leg cannot be reliably conducted by current onboard equipment. It will be necessary to install either a DCP or ICP optical emission spectrometer in the chemistry laboratory. DCP instruments have been successfully used at sea during a number of cruises (e.g., Langmuir et al., 1986). Their requirements in terms of space, power, and ventilation are comparable to those of the atomic absorption instruments already on board. Sample dissolution will require small amounts of hydrofluoric and nitric acids.