Shipboard analysis of picomolar levels of manganese in seawater by chelating resin concentration and chemiluminescence detection

Abstract

A new shipboard analytical method for determining picomolar levels of manganese in seawater has been developed. The method is based on a combination of chelating resin column extraction and improved chemiluminescence (CL) detection in a closed flow system. In this method, manganese in sample solution is selectively collected on newly-developed iminodiacetate-immobilized chelating resin, and then eluted with acidic solution containing hydrogen peroxide. The resulting eluent is mixed with luminol solution and aqueous ammonia after removal of iron ions by a chelating resin column, and then the mixture is introduced into the CL cell. The manganese concentration is obtained from the CL intensity. The detection limit (3SD) of manganese is 5 pmol L(-1) from 9 mL of seawater sample. The method was applied to seawater samples collected at the Okinawa Trough.

Rare Earth Elements in the hydrothermal system at Okinawa Trough back-arc basin

“…The CH 4 concentration and carbon stable isotope at 1200 m depth indicated that active microbial CH 4 oxidation caused the δ 13 C increase of residual CH 4 as the plume aged. A plume signal was also observed at 1200 m at SPOT-4 in Mn along with transmission profiles (Doi et al, 2004). SPOT-5 is the closest station to the hydrothermal vent (Fig.…”

“…Results of this study elucidated REE fractionation in fluid samples using previous analytical data. We were also able to distinguish REE removal mechanisms occurring at the vent site and water column using REE pattern characteristics.Keywords: Okinawa Trough, sediment-hosted hydrothermal activity, rare earth elements, hydrothermal fluid, hydrothermal plume site, expansion of the hydrothermal plume had been observed using the manganese distribution (Doi et al, 2004) and light transmission anomalies. The use of REE presents great advantages for seawater characterization over using dissolved oxygen, salinity, and single trace elements by its single use: high-precision REE data are more sensitive than other proxies because of their great dynamic range of concentrations in seawater.…”

Flow injection analysis as a tool for enhancing oceanographic nutrient measurements—A review

“…More recently, Doi et al [234] used the catalytic effect of Mn ions on the oxidation of luminol and hydrogen peroxide to develop a highly sensitive method for the determination of picomolar concentrations of Mn. Seawater samples were buffered to pH 8.…”

“…FIA-CL methods are based on the catalytic effect of Mn ions on the oxidation of 7,7,8,8-tetracyanoquinodimethane (TCNQ) or luminol [66,234]. Chapin, Johnson and Coale [66] presented a FIA-CL method based on the Mn(II)-catalysis of the oxidation of 7,7,8,8-tetracyanoquinodimethane (TCNQ) in alkaline solution.…”

Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough

“…The Mn samples (unfiltered) were acidified to pH 2 by adding ultrapure HNO 3 (TAMAPURE, AA-100). After adjusting the sample pH at 8.8 in the shorebased laboratory, total dissolvable Mn was measured using an automatic Mn analyzer based on chelating resin preconcentration and chemiluminescense detection (Doi et al, 2004).…”