BIOCHEMICAL STUDIES ON 'SUB-MICROMETER PARTICLES' AT DAYA BAY I. STUDY ON CONCENTRATION, DISTRIBUTION AND CORRELATION OF TRACE METALS IN DIFFERENT SIZE FRACTIONS

摘要

This paper discusses the measured concentrations of trace metals in different size frac- tions at Daya Bay, and describes the features of distribution and variation of lead, copper and cadmium there. On average, 16/100 of Pb, 10/100 of Cu and 8/100 of Cd which previously would have been considered in the dissolved phase are actually associated with colloidal material. Thus, past studies overestimate the dissolved trace-metal concentration. The correlation between the colloidal fraction and the so-called dis- solved fraction suggests the significant role of colloidal material in the biogeochemistry of trace metals.