Cold-trap preconcentration method for the determination of mercury in sea water and in other natural materials

1974 ◽  
Vol 46 (13) ◽  
pp. 1882-1885 ◽  
Author(s):  
William F. Fitzgerald ◽  
W. Berry. Lyons ◽  
Carlton D. Hunt
Keyword(s):  
Sea Water ◽  
Cold Trap ◽  
Natural Materials ◽  
Preconcentration Method

scholarly journals Simultaneous Determination of Iron and Cobalt using Spectrophotometry after Catanionic Mixed Micellar Cloud Point Extraction Procedure

2020 ◽  
Vol 36 (6) ◽  
pp. 1168-1172
Author(s):  
Ravi Kumar Kakitha ◽  
Shyamala Pulipaka ◽  
Deva Hari Puranam
Keyword(s):  
Mixed Micelles ◽  
Sea Water ◽  
Tap Water ◽  
Sodium Dodecyl ◽  
Extraction Procedure ◽  
Maximum Efficiency ◽  
Hcl Concentration ◽  
Cationic And Anionic Surfactants ◽  
Preconcentration Method

A new preconcentration method which utilises a mixture of cationic and anionic surfactants for separation and spectrophotometric determination of iron and cobalt simultaneously has been developed. The metal ions, iron and cobalt were complexed with thiocyante. The hydrophobic complexes of iron and cobalt were then extracted into catanionic mixed micelles of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulphate (SDS). Different parameters like concentration of HCl, concentration of thiocyanate, concentrations of the surfactants (CTAB and SDS), equilibration temperature and time were studied to get maximum efficiency. The linear ranges of Fe3+ and Co2+ were found to be 0.139 – 0.838 μg mL–1 and 5.89 – 35.4 μg mL–1, respectively the detection limits obtained were 1.54 ng mL–1 and 6.18 ng mL–1. The developed procedure has been employed for the retrieval of Fe3+ and Co2+ in water samples successfully (tap water and sea water). 98 – 107% recoveries were obtained.

scholarly journals Harnessing PET to track micro- and nanoplastics in vivo

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Outi Keinänen ◽  
Eric J. Dayts ◽  
Cindy Rodriguez ◽  
Samantha M. Sarrett ◽  
James M. Brennan ◽  
...  
Keyword(s):  
Sea Water ◽  
Accurate Determination ◽  
Nuclear Imaging ◽  
Imaging Data ◽  
Biodistribution Studies ◽  
Positron Emission ◽  
20 Nm ◽  
Pharmacokinetic Behavior

AbstractThe proliferation of plastics in the environment continues at an alarming rate. Plastic particles have been found to be persistent and ubiquitous pollutants in a variety of environments, including sea water, fresh water, soil, and air. In light of this phenomenon, the scientific and medical communities have become increasingly wary of the dangers posed to human health by chronic exposure to microplastics (< 5 mm diameter) and nanoplastics (< 100 nm diameter). A critical component of the study of the health effects of these pollutants is the accurate determination of their pharmacokinetic behavior in vivo. Herein, we report the first use of molecular imaging to track polystyrene (PS) micro- and nanoplastic particles in mammals. To this end, we have modified PS particles of several sizes—diameters of 20 nm, 220 nm, 1 µm, and 6 µm—with the chelator desferrioxamine (DFO) and radiolabeled these DFO-bearing particles with the positron-emitting radiometal zirconium-89 (89Zr; t1/2 ~ 3.3 d). Subsequently, positron emission tomography (PET) was used to visualize the biodistribution of these radioplastics in C57BL/6J mice at 6, 12, 24, and 48 h after ingestion. The imaging data reveal that the majority of the radioplastics remain in the gastrointestinal tract and are eliminated through the feces by 48 h post-ingestion, a result reinforced by acute biodistribution studies. Ultimately, this work suggests that nuclear imaging—and PET in particular—can be a sensitive and effective tool in the urgent and rapidly growing effort to study the in vivo behavior and potential toxicity of micro- and nanoplastics.

Photometric determination of silicate in sea water

1936 ◽  
Vol 8 (6) ◽  
pp. 455-457 ◽  
Author(s):  
Rex J. Robinson ◽  
Herbert J. Spoor
Keyword(s):  
Sea Water ◽  
Photometric Determination

scholarly journals Progress in the determination of 227Ac in sea water

2008 ◽  
Vol 109 (3-4) ◽  
pp. 238-249 ◽  
Author(s):  
Walter Geibert ◽  
Ingrid Vöge
Keyword(s):  
Sea Water
Sign in / Sign up

Export Citation Format

Share Document