units are given below the parameter name																																																																																						

"see for detailed information paper Trace metals in the Ross Sea . L.J.A. Gerringa,et al.
"																																																																																						

Methods:
sampling
Samples were taken during NBP13-10 on the RVIB Nathaniel B. Palmer in the Ross Sea.  Modified 12 L Go-FLO (Oceanics) samplers from Royal NIOZ (the Netherlands) were attached to a trace metal clean (TMC) frame from  the United States Antarctic Program on a Kevlar cable. Water was subsampled and filtered (Sartorius®, 0.2 μm; Sartobran 300) inside a trace metal clean van directly from the GO-FLO’s.  Samples were acidified with HCl (Seastar© baseline hydrochloric acid;) to a concentration of 0.024 M (pH 1.7-1.8) within a laminar flow  bench in a plastic bubble with overpressure achieved by inflow of air through a HEPA filter inside the bubble.  The sample bottles were rigorously cleaned in three steps according to GEOTRACES protocols. 
Analysis
Trace metals were analysed with a Thermo Finnigan HR-ICPMS element 2. A volume of 30 mL sample was pipetted into an acid cleaned FEP vial.  An internal standard (indium and lutetium) at a concentration of 5 nM prior to UV digestion (Middag et al., 2015). The samples were digested for 4h in a home-made UV box after which they were pre-concentrated using a SeaFAST inline pre-concentration system,  using Nobias PA1 resin in the pre-concentration column. We pre-concentrated 2 loops of 10ml each into 500ul which gives a pre-concentration factor of 40. Samples were eluted in 1.5M QD-HNO3 that contained rhodium as internal standard.  The system was calibrated via standard additions using a home-made stock solution made of 1000ppm single spike standards. A typical calibration line consisted out of 7 standard additions where the maximum standard additions are comparable to maximum  concentrations in the marine environment. A multi-element stock standard with natural isotopic abundances of Mn, Fe, Co, Ni, Cu, Zn, Cd, Y, La, Ti and Pb, in 0.024M HNO3 was used. To make standard additions to natural seawater with low  concentrations of metals for calibration. We used North Atlantic Surface water (Bay of Biscay) water for the calibration. The added table contains the analysis of Geotraces reference material D1, with the consensus values.

SD is added square root of sum squared internal and external errors, internal error is the SD of triplicate measurements, the external being the SD of a lab standard water (NADW) measured often (N=48).


NA means not analysed

Middag, R., Séférian, R. Conway, T.M., John, S.G., Bruland, K.W., de Baar, H.J.W., 2015. Intercomparison of dissolved trace elements at the Bermuda Atlantic
Time Series station. Marine Chemistry 177, 476–489.