scholarly journals Small Volume (1-3l) Filtration of Coastal Seawater Samples

10.3791/1163 ◽  
2009 ◽  
Author(s):  
David A. Walsh ◽  
Elena Zaikova ◽  
Steven J. Hallam
Keyword(s):  
Small Volume ◽  
Coastal Seawater ◽  
Seawater Samples

scholarly journals 228Ra and 226Ra in coastal seawater samples from the Ubatuba region: Brazilian southeastern coastal region

2006 ◽  
Vol 17 (4) ◽  
pp. 730-736 ◽  
Author(s):  
José Marcus Godoy ◽  
Zenildo Lara de Carvalho ◽  
Flávio da Costa Fernandes ◽  
Olga M. Danelon ◽  
Maria Luiza D. P. Godoy ◽  
...  
Keyword(s):  
Coastal Region ◽  
Coastal Seawater ◽  
Seawater Samples

scholarly journals Large Volume (20L+) Filtration of Coastal Seawater Samples

10.3791/1161 ◽  
2009 ◽  
Author(s):  
David A. Walsh ◽  
Elena Zaikova ◽  
Steven J. Hallam
Keyword(s):  
Large Volume ◽  
Coastal Seawater ◽  
Seawater Samples

Role of the Fenton Reaction in Coastal Seawater Samples Collected in Okinawa, Japan

2017 ◽  
Vol 46 (1) ◽  
pp. 42-44 ◽  
Author(s):  
Asha M. Hamdun ◽  
Yumi Higaonna ◽  
Hiroyuki Uehara ◽  
Takemitsu Arakaki
Keyword(s):  
Fenton Reaction ◽  
Coastal Seawater ◽  
Seawater Samples

A study on the relationship between BOD5 and COD in a coastal seawater environment with a rapid BOD measurement system

2010 ◽  
Vol 61 (6) ◽  
pp. 1499-1503 ◽  
Author(s):  
X. L. Jin ◽  
M. Jing ◽  
X. Chen ◽  
Z. X. Zhuang ◽  
X. R. Wang ◽  
...  
Keyword(s):  
Linear Relationship ◽  
Oxygen Depletion ◽  
High Concentration ◽  
Membrane Flow ◽  
Coastal Seawater ◽  
Relationship Model ◽  
Seawater Environment ◽  
Seawater Samples ◽  
Two Parameters ◽  
The Relationship

The dual objectives of this study are to: (1) examine the relationship between COD and BOD in seawater environment with a rapid but reliable method for the measurement of BOD in seawater, and (2) establish the relationship model between BOD5 and COD in the firth of Dongbao River to predict the values of BOD5. The first objective is met by the successful development of a technique utilizing bacteria-immobilized membrane flow cell for biodegradation process, coupled with fibre optic fluorescence detection for oxygen depletion quantitation. The technique has been applied to coastal seawater samples collected in the coastal area of Shenzhen, China. The BOD5 and COD values for the samples are acquired and the results show that there is no apparent linear relationship existing between BOD5 and COD in relatively clean seawater samples away from the shore. However, in estuary water samples containing relatively high concentration of sewage contamination, a linear correlation does exist between BOD5 and COD. The linear relationship between the two parameters allows for the calculation of BOD5 values based on COD data which can be measured more readily and precisely.

scholarly journals Review of the analysis of 234Th in small volume (2–4 L) seawater samples: improvements and recommendations

2021 ◽  
Author(s):  
Samantha J. Clevenger ◽  
Claudia R. Benitez-Nelson ◽  
Jessica Drysdale ◽  
Steven Pike ◽  
Viena Puigcorbé ◽  
...  
Keyword(s):  
Small Volume ◽  
Recovery Process ◽  
Chemical Recovery ◽  
Wait Times ◽  
Upper Ocean ◽  
Beta Counting ◽  
Particle Scavenging ◽  
Seawater Samples

AbstractThe short-lived radionuclide 234Th is widely used to study particle scavenging and transport from the upper ocean to deeper waters. This manuscript optimizes, reviews and validates the collection, processing and analyses of total 234Th in seawater and suggests areas of further improvements. The standard 234Th protocol method consists of scavenging 234Th from seawater via a MnO2 precipitate, beta counting, and using chemical recoveries determined by adding 230Th. The revised protocol decreases sample volumes to 2 L, shortens wait times between steps, and simplifies the chemical recovery process, expanding the ability to more rapidly and safely apply the 234Th method.

scholarly journals Mimosine, the Allelochemical from the Leguminous Tree Leucaena leucocephala, Selectively Enhances Cell Proliferation in Dinoflagellates

2002 ◽  
Vol 68 (10) ◽  
pp. 5160-5163 ◽  
Author(s):  
Patrick K. K. Yeung ◽  
Francis T. W. Wong ◽  
Joseph T. Y. Wong
Keyword(s):  
Cell Proliferation ◽  
Leucaena Leucocephala ◽  
Leguminous Tree ◽  
Coastal Seawater ◽  
Seawater Samples

ABSTRACT Mimosine, the allelochemical from the leguminous tree Leucaena leucocephala, is toxic to most terrestrial animals and plants. We report here that while mimosine inhibits major phytoplankton groups, it enhances cell proliferation in dinoflagellates. On addition to coastal seawater samples, mimosine is able to confer a growth advantage to dinoflagellates. The use of mimosine will promote the isolation and culture of this group of phytoplankton.

scholarly journals Improved biodiversity detection using a large-volume environmental DNA sampler with in situ filtration and implications for marine eDNA sampling strategies

2022 ◽  
Author(s):  
Annette F. Govindarajan ◽  
Luke McCartin ◽  
Allan Adams ◽  
Elizabeth Allan ◽  
Abhimanyu Belani ◽  
...  
Keyword(s):  
Large Volume ◽  
Small Volume ◽  
Deep Ocean ◽  
Environmental Dna ◽  
Marine Biodiversity ◽  
Robotic Vehicle ◽  
Seawater Samples ◽  
Biodiversity Changes ◽  
Collection Strategies

Metabarcoding analysis of environmental DNA samples is a promising new tool for marine biodiversity and conservation. Typically, seawater samples are obtained using Niskin bottles and filtered to collect eDNA. However, standard sample volumes are small relative to the scale of the environment, conventional collection strategies are limited, and the filtration process is time consuming. To overcome these limitations, we developed a new large-volume eDNA sampler with in situ filtration, capable of taking up to 12 samples per deployment. We conducted three deployments of our sampler on the robotic vehicle Mesobot in the Flower Garden Banks National Marine Sanctuary in the northwestern Gulf of Mexico and collected samples from 20 to 400 m depth. We compared the large volume (~40-60 liters) samples collected by Mesobot with small volume (~2 liters) samples collected using the conventional CTD-mounted Niskin bottle approach. We sequenced the V9 region of 18S rRNA, which detects a broad range of invertebrate taxa, and found that while both methods detected biodiversity changes associated with depth, our large volume samples detected approximately 66% more taxa than the CTD small volume samples. We found that the fraction of the eDNA signal originating from metazoans relative to the total eDNA signal decreased with sampling depth, indicating that larger volume samples may be especially important for detecting metazoans in mesopelagic and deep ocean environments. We also noted substantial variability in biological replicates from both the large volume Mesobot and small volume CTD sample sets. Both of the sample sets also identified taxa that the other did not; although the number of unique taxa associated with the Mesobot samples was almost four times larger than those from the CTD samples. Large volume eDNA sampling with in situ filtration, particularly when coupled with robotic platforms, has great potential for marine biodiversity surveys, and we discuss practical methodological and sampling considerations for future applications.

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