Loss of radiocarbon in direct use of Aquasol for liquid scintillation counting of solutions containing ¹⁴C‐NaHCO₃1

Abstract

Carbon‐14 activity was lost when 14C‐NaHCO3 in aqueous solution was added to Aquasol. Phenethylamine can be used to form carbamates which are stable in Aquasol in order to achieve complete retention of 14C in the liquid scintillation cocktail.

Temporal and spatial variability of phytoplankton in a subtropical ecosystem1,2

“…California 1972). Working 14C activities were standardized according to the method of Iverson et al (1976). casts at both stations.…”

A test of the assumptions and predictions of recent microalgal growth models with the marine phytoplankter Pavlova lutheri

“…Duto 60.5 mol quanta m-2 d.-' as determined plicate dark vials containing 0.01 mM with the QSL 100 quantameter. To begin a DCMU (Legendre et al 1983) were includ-P vs. Z, experiment, we withdrew -40 ml ed with each experiment to correct for nonfrom the growth chamber and spiked it with photosynthetic uptake of 14Ca Total 14C ac-tivity was measured on 0.05-ml aliquots of labeled culture pipetted into 0.5 ml of phenethylamine (Iverson et al 1976). At the end of the incubation all vials used to measure 14C uptake were acidified with 0.3 ml of 10% HCl and degassed as per Lewis and Smith (1983).…”

Primary productivity and its regulation in the Arabian Sea during 1995

“…To determine the total added activity (DPM ), upon retrieval of incubation bottles a 1-ml subsample was taken from selected depths and added directly to scintillation vials containing 0.1 ml of beta-phenylethylamine (Iverson et al, 1976) and 1 ml of scintillation #uid. The samples were "ltered through 25-mm Whatman GF/F "lters with a 200-mmHg vacuum.…”