Alguns aspectos metodológicos da medida da excreção de matéria orgânica pelo fitoplâncton por espectrometria de cintilação líquida

Abstract

Some aspects of the procedures to measure dissolved organic matter (DOM) released by phytoplankton account for important _sources of errors. These aspects inalude: cell damage upon filtration of samples, residual inorganic l~C in the filtrates, NaHl~C03 ampoule contaminations and the low radiation activity proper to the released samples. Some experiments on these procedural problems were carried out and their effects on the released DOM were evaluated. A procedure to use control samples to avoid errors in the technique of DOM analysis by the liquid cintillation counter is described. Experiments on the validity of stocking preserved filtrates of natural plankton populations and algal cultures were alao carried out for long periods prior to the radioactivity measurements.

Excreção de matéria orgânica dissolvida por populações fitoplanctônicas marinhas em bioensaios com nutrientes

“…relativo desse erro. Os aspectos metodológicos das determinações da excreção por nós empregados, neste trabalho, foram já bem discutidos, em Vieira & Aidar-Aragão (1982).…”