Živković and his colleagues led a close study of the mercury speciation along the 40°S GEOTRACES section.
carbon
In situ detection of Particulate Inorganic Carbon using optical sensors
They have developed optical sensors for particulate inorganic carbon concentration.
Pros and cons of carbon, nitrogen and silicon as tracers of modern and paleo-productivity
Farmer and colleagues review the geochemical proxies based upon sedimentary isotope ratios of three abundant biologically mediated elements.