Analysis

On the optimal use of the seaFAST system

Do you wish to improve your recoveries, blanks or any other parameter of your seawater preconcentration system (seaFAST)? Or are you simply curious about it? Wuttig and co-workers (2019, see reference below) propose a critical evaluation of this system’s capabilities. They perform an impressive list of tests including system conditioning, improving blank levels, finding the optimal […]

Apr / 18 / 2019

Using ICPMS/MS to determine manganese, iron, nickel, copper, zinc, cadmium and lead concentrations on less than 40ml of seawater

Jackson and co-workers (2018, see reference below) first did a classical offline preconcentration of small seawater aliquots using a SeaFast system. More innovative is the use of a state of the art inductively coupled plasma – tandem mass spectrometry (ICPMS/MS) to analyse the eluate. Such tool combines two mass-selecting quadrupoles separated by an octopole collision/reaction […]

Apr / 30 / 2018

A new method for simultaneous analysis of nickel, copper and zinc isotopes in seawater

Takano and co-workers (2017, see reference below) have developed a new method to determine nickel (Ni), copper (Cu) and zinc (Zn) isotopes in seawater. This method is very simple and rapid only using single chelating extraction and single anion exchange. First, target metals are extracted from seawater by NOBIAS Chelate PA-1 resin. Then, target metals […]

Apr / 18 / 2017

Onboard analysis of dissolved zinc everywhere in the open ocean with a Lab on Valve (LOV) system of the size of a bottle of wine is becoming possible

Thanks to the work of Maxime Grand and collaborators (2016, see reference below), it is now possible to analyse dissolved zinc (DZn) on board, from any kind of seawater using a “Lab On Valve (LOV)” method. For the first time, automated matrix removal, extraction of the target element, and fluorescence detection have been performed within […]

Jun / 03 / 2016

An example of a fruitful international intercomparison

The reliability of the GEOTRACES data products including the eGEOTRACES Electronic Atlas is strongly related to the quality of the data acquired by the different laboratories contributing to this international effort. A key aspect for assessing this quality relies on the good intercomparison of the trace metal data. Iron (Fe) concentrations and moreover Fe isotopes count among […]

May / 19 / 2016

All mercury species measured along the GEOTRACES-UK section, South Atlantic Ocean

Total mercury (THg), methylated mercury (MeHg), and dissolved gaseous mercury (DGM) concentrations were determined along 40°S in the Atlantic Ocean. All Hg species had higher concentrations in western than in eastern basin, although they are at the ultra-low femtomolar level. MeHg increases with lower oxygen concentration, substantiating that microbial respiration of organic matter stimulates MeHg […]

May / 13 / 2016

Important warning about the uncertainties affecting results of dissolved iron concentration measurements in seawater using flow-injection with chemiluminescence detection

Flow-Injection with Chemiluminescence (FI-CL) is a procedure commonly applied in the framework of the GEOTRACES cruises because of its portability and hence suitability for shipboard deployment. Following the Guide for Uncertainty Measurement (GUM) approach, Floor and colleagues propose dedicated mathematical equations allowing the estimation of measurement uncertainties. They apply their model to estimate combined uncertainties […]

Mar / 18 / 2016

A new method to measure lead isotopes in the ocean with an outstanding precision

A new method for the determination of seawater lead (Pb) isotope compositions and concentrations was developed, which combines and optimizes previously published protocols for the separation and isotopic analysis of this element. It involves 1 to 2 L of seawater, double spike, magnesium hydroxide coprecipitation, anion exchange chromatography and thermal ionization mass spectrometry. Ratios involving the […]

Mar / 06 / 2015

First results from platinum reference samples published

In Cobelo-García and co-authors work, data on platinum (Pt) concentrations in SAFe and GEOTRACES reference samples is reported for the first time. The paper also provides helpful information for those using voltammetric procedures for the analysis of trace elements in seawater, where the use of signal processing (e.g. second derivative) can successfully be used to […]

Apr / 02 / 2014

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