An intercalibration for trace metals in seawater |
| |
| Authors: | JM Bewers J Dalziel PA Yeats JL Barron |
| |
| Institution: | Atlantic Oceanographic Laboratory, Bedford Institute of Oceanography, Dartmouth, Nova Scotia Canada |
| |
| Abstract: | This paper describes the results of a recent international intercalibration experiment for trace metals in seawater. The results show that considerable improvements in analytical ability have been made for several metals at concentrations close to those found in offshore marine waters. Some systematic differences between the results of analyses of frozen and acidified samples are evident for most metals. The application of two different analytical techniques, atomic absorption spectrophotometry and anodic stripping voltammetry, appears to introduce relatively small differences in the results for copper and cadmium at near-natural concentrations.Two factors limiting our ability to conduct trace metal intercalibrations at the levels found in the deep ocean are the extent of tolerable contamination, especially for zinc and lead, and the degree to which the overall homogeneity of a group of intercalibration samples can be assured. Some reexamination of methods of sample preparation needs to be carried out before such low level calibrations can be effectively conducted. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
