Determination of mercury in soils and biological matrices by the vanadium pentoxide digestion procedure

1974 ◽  
Vol 2 (4) ◽  
pp. 315-330 ◽  
Author(s):  
M. Malaiyandi ◽  
J. P. Barrette
Keyword(s):  
Vanadium Pentoxide ◽  
Biological Matrices ◽  
Digestion Procedure

Wet Oxidation Method for the Determination of Submicrogram Quantities of Mercury in Cereal Grains

1972 ◽  
Vol 55 (5) ◽  
pp. 951-959 ◽  
Author(s):  
M Malaiyandi ◽  
J P Barrette
Keyword(s):  
Vanadium Pentoxide ◽  
Cereal Grains ◽  
Acid Mixture ◽  
Wet Oxidation ◽  
Digestion Method ◽  
Oxidation Method ◽  
Digestion Procedure ◽  
Wet Digestion ◽  
Cereal Flour

Abstract A simple and rapid wet-digestion procedure is described in which flour samples containing bound and unbound mercury are decomposed, using a sulfuric-nitric acid mixture in the presence of small amounts of vanadium pentoxide. Fortification studies with 3 organomercuric compounds on mixed cereal flour indicate average recoveries in excess of 96% in the 20–500 ppb range. This wet digestion method is compared with the Klein procedure to illustrate the advantages and significance of the vanadium pentoxide oxidation.

Atomic Absorption Spectrometric Determination of Arsenic

1974 ◽  
Vol 57 (1) ◽  
pp. 18-21
Author(s):  
William L Hoover ◽  
James R Melton ◽  
Peggy A Howard ◽  
James W Bassett
Keyword(s):  
Atomic Absorption ◽  
Biological Matrices ◽  
Digestion Procedure ◽  
Mixing Chamber ◽  
Plastic Bag ◽  
Aoac Method ◽  
Atomic Absorption Spectrometric

Abstract The official AOAC method for arsenic in feeds has been adapted to an atomic absorption spectrophotometric technique in which the arsenic trapped in the absorbing solution is aspirated into the flame. Values as low as 0.5 μg As/g can be measured in a 10 g sample. A modified digestion procedure is described. A second method is described for the determination of submicrogram quantities of arsenic whereby the arsine gas is generated into a plastic bag and introduced directly into the flame. Air-acetylene fuels are utilized, requiring no alterations in the nebulizer and mixing chamber. Sensitivity attained from a 10 g sample is 0.1 μg As/g. Results of various biological matrices, which were determined by the AOAC method and the 2 described methods, compare favorably.

µSPE followed by HPLC-MS/MS for the determination of series D and E resolvins in biological matrices

2021 ◽  
pp. 114181
Author(s):  
Federico Fanti ◽  
Eleonora Oliva ◽  
Daniel Tortolani ◽  
Camilla Di Meo ◽  
Marina Fava ◽  
...  
Keyword(s):  
Biological Matrices

An insight into the determination of size and number concentration of silver nanoparticles in blood using single particle ICP-MS (spICP-MS): Feasibility of application to samples relevant to in vivo toxicology studies

2021 ◽  
Author(s):  
Isabel Abad-Álvaro ◽  
Diego Leite ◽  
Dorota Bartczak ◽  
Susana Cuello ◽  
Beatriz Gomez-Gomez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Single Particle ◽  
Number Concentration ◽  
Biological Matrices ◽  
Icp Ms ◽  
Toxicological Studies ◽  
Insight Into

Toxicological studies concerning nanomaterials in complex biological matrices usually require a carefully designed workflow that involves handling, transportation and preparation of a large number of samples without affecting the nanoparticle...

scholarly journals Analytical Methods for the Determination of Neuroactive Steroids

Biomolecules ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 553
Author(s):  
Michal Kaleta ◽  
Jana Oklestkova ◽  
Ondřej Novák ◽  
Miroslav Strnad
Keyword(s):  
Nervous System ◽  
Steroid Hormone ◽  
Neuroactive Steroids ◽  
Physiological Changes ◽  
Biological Matrices ◽  
Pathological Conditions ◽  
Reliable Monitoring ◽  
Hormonal Steroids ◽  
Endocrine Tissues

Neuroactive steroids are a family of all steroid-based compounds, of both natural and synthetic origin, which can affect the nervous system functions. Their biosynthesis occurs directly in the nervous system (so-called neurosteroids) or in peripheral endocrine tissues (hormonal steroids). Steroid hormone levels may fluctuate due to physiological changes during life and various pathological conditions affecting individuals. A deeper understanding of neuroactive steroids’ production, in addition to reliable monitoring of their levels in various biological matrices, may be useful in the prevention, diagnosis, monitoring, and treatment of some neurodegenerative and psychiatric diseases. The aim of this review is to highlight the most relevant methods currently available for analysis of neuroactive steroids, with an emphasis on immunoanalytical methods and gas, or liquid chromatography combined with mass spectrometry.

Sign in / Sign up

Export Citation Format

Share Document