Shipboard analysis of picomolar levels of manganese in seawater by chelating resin concentration and chemiluminescence detection.
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.
Doi
Takashi
T
Ocean Research Institute, University of Tokyo, Nakano, 164-8639, Tokyo, Japan. takashidoi@ori.u-tokyo.ac.jp
Obata
Hajime
H
Maruo
Masahiro
M
D000327:Adsorption; D002138:Calibration; D002614:Chelating Agents / Q000737:chemistry*; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements / Q000379:methods*; D008345:Manganese / Q000032:analysis*; D012623:Seawater / Q000737:chemistry*; D012680:Sensitivity and Specificity
D002614:Chelating Agents; D005465:Fluorocarbon Polymers; D008345:Manganese