scholarly journals Procedure for the determination of uranium on cellulose air-sampling filters by photon-electron-rejecting-alpha-liquid-scintillation spectrometry

1986 ◽  
Author(s):  
W. J. McDowell ◽  
G. N. Case
Keyword(s):  
Liquid Scintillation ◽  
Air Sampling ◽  
Liquid Scintillation Spectrometry

Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry

1997 ◽  
Vol 222 (1-2) ◽  
pp. 69-74 ◽  
Author(s):  
Nguyen Dinh Chau ◽  
J. Niewodniczański ◽  
J. Dorda ◽  
A. Ochoński ◽  
E. Chrusciel ◽  
...  
Keyword(s):  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometry ◽  
Mine Waters ◽  
Radium Isotopes

scholarly journals Determination of Radon by Liquid Scintillation α/β Particle Spectrometry: Towards the Resolution of a 14C Dating Problem

Radiocarbon ◽  
1988 ◽  
Vol 30 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Henry Polach ◽  
Lauri Kaihola
Keyword(s):  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometry ◽  
14C Dating ◽  
Particle Emissions ◽  
Radon Decay ◽  
Mathematical Evaluation ◽  
Counting Window ◽  
Age Determinations

Traces of uranium and radium within the 14C sample generate radon (Rn) which gets occluded during the benzene synthesis, thus generating false (extra) counts within the 14C counting window. This, if undetected, gives rise to erroneous 14C age determinations. The application of simultaneous α and β liquid scintillation spectrometry will enable a mathematical evaluation of the 14C signal unaffected by α and β particle emissions from radon decay daughters.

Determination of Naptalam and Its Metabolite in Foods, as 1-Naphthylamine, Using Liquid Chromatography with Oxidative Electrochemical Detection

1987 ◽  
Vol 70 (6) ◽  
pp. 1021-1024
Author(s):  
Brian L Worobey ◽  
Brian J shields
Keyword(s):  
Liquid Chromatography ◽  
Electrochemical Detection ◽  
Liquid Scintillation ◽  
Base Hydrolysis ◽  
Liquid Scintillation Spectrometry ◽  
Applied Potential ◽  
Electrochemical Detector ◽  
Reverse Phase ◽  
Hydrolysis Of

Abstract A new method is described for the determination of the herbicide naptalam and its metabolite l-naphthylamine in several foods. The method is sensitive, selective, and extremely rapid compared with previously reported methods. Liquid chromatography with electrochemical detection (LC/ECD) is used to determine l-naphthylamine produced from the metabolism or base hydrolysis of naptalam in asparagus, peaches, and cranberries. These foods were spiked with naptalam at 0.05 and 0.11 ppm and hydrolyzed with 30% NaOH with concomitant distillation of l-naphthylamine. Aliquots of the distillate were injected onto a reverse-phase PRP-1 LC column for separation of l-naphthylamine from coextractives near the solvent front and detection at an applied potential of +0.83 V using an amperometric electrochemical detector in the oxidation mode. Recoveries ranged from 89% ± 2% to 97% ± 8% for all foods at both spiking levels. Accuracy of these recoveries was confirmed by use of "C-radioIabeled naptalam and radioassay by liquid scintillation spectrometry of the "C-l-naphthylamine released.

Absorption, Translocation, and Metabolism of14C-Halosulfuron in Grafted Eggplant and Tomato

2017 ◽  
Vol 31 (6) ◽  
pp. 908-914
Author(s):  
Sushila Chaudhari ◽  
Katherine M. Jennings ◽  
David W. Monks ◽  
David L. Jordan ◽  
Christopher C. Gunter ◽  
...  
Keyword(s):  
Liquid Scintillation ◽  
Parent Compound ◽  
Vegetable Production ◽  
Liquid Scintillation Spectrometry ◽  
Differential Absorption ◽  
Tomato Cultivar ◽  
Tomato Plants ◽  
Treated Leaf ◽  
Site Of Action

Grafted plants are a combination of two different interspecific or intraspecific scion and rootstock. Determination of herbicidal selectivity of the grafted plant is critical given their increased use in vegetable production. Differential absorption, translocation, and metabolism play an important role in herbicide selectivity of plant species because these processes affect the herbicide amount delivered to the site of action. Therefore, experiments were conducted to determine absorption, translocation, and metabolism of halosulfuron in grafted and non-grafted tomato and eggplant. Transplant type included non-grafted tomato cultivar Amelia, non-grafted eggplant cultivar Santana, Amelia scion grafted onto Maxifort tomato rootstock (A-Maxifort) and Santana scion grafted onto Maxifort rootstock (S-Maxifort). Plants were treated POST with commercially formulated halosulfuron at 39 g ai ha-1followed by14C-halosulfuron under controlled laboratory conditions. Amount of14C-halosufuron was quantified in leaf wash, treated leaf, scion shoot, rootstock shoot, and root at 6, 12, 24, 48, and 96 h after treatment (HAT) using liquid scintillation spectrometry. No differences were observed between transplant types with regard to absorption and translocation of14C-halosulfuron. Absorption of14C-halosulfuron increased with time, reaching 10 and 74% of applied at 6 and 96 HAT, respectively. Translocation of14C-halosulfuron was limited to the treated leaf, which reached maximum (66% of applied) at 96 HAT, whereas minimal (<4% of applied) translocation occurred in scion shoot, rootstock shoot, and root. Tomato plants metabolized halosulfuron faster compared to eggplant regardless of grafting. Of the total amount of14C-halosulfuron absorbed into the plant, 9 to 14% remained in the form of the parent compound in tomato compared with 25 to 26% in eggplant at 48 HAT. These results indicate that grafting did not affect absorption, translocation, and metabolism of POST halosulfuron in tomato and eggplant.

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