scholarly journals Chemical Form and Distribution of Selenium and Sulfur in the Selenium Hyperaccumulator Astragalus bisulcatus

2003 ◽  
Vol 131 (3) ◽  
pp. 1460-1467 ◽  
Author(s):  
Ingrid J. Pickering ◽  
Carrie Wright ◽  
Ben Bubner ◽  
Danielle Ellis ◽  
Michael W. Persans ◽  
...  
Keyword(s):  
Chemical Form ◽  
Astragalus Bisulcatus

Proposal of a Flow scheme for the Chemical-form-based Quantitative analysis of Chlorine compounds in Pulp for Sanitary products and Safety assessment

2018 ◽  
Vol 72 (11) ◽  
pp. 1243-1250
Author(s):  
Shigeo Imai ◽  
Mitsuhiro Wada ◽  
Takeharu Wada ◽  
Kei Iwasaki ◽  
Ritsuko Katagiri ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Safety Assessment ◽  
Chemical Form ◽  
Flow Scheme ◽  
Sanitary Products

scholarly journals Determination of Chemical Form of Antimony in Contaminated Soil around a Smelter Using X-ray Absorption Fine Structure

2005 ◽  
Vol 21 (7) ◽  
pp. 769-773 ◽  
Author(s):  
Masaki TAKAOKA ◽  
Satoshi FUKUTANI ◽  
Takashi YAMAMOTO ◽  
Masato HORIUCHI ◽  
Naoya SATTA ◽  
...  
Keyword(s):  
Fine Structure ◽  
Contaminated Soil ◽  
Chemical Form ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Chemical form of selenium in soybean (Glycine max L.) lectin

1992 ◽  
Vol 40 (11) ◽  
pp. 2084-2091 ◽  
Author(s):  
Shridhar K. Sathe ◽  
April C. Mason ◽  
Rosemary. Rodibaugh ◽  
Connie M. Weaver
Keyword(s):  
Glycine Max ◽  
Chemical Form ◽  
Glycine Max L

On the Chemical Form of Mercury in Edible Fish and Marine Invertebrate Tissue

1992 ◽  
Vol 49 (5) ◽  
pp. 1010-1017 ◽  
Author(s):  
Nicolas S. Bloom
Keyword(s):  
Total Mercury ◽  
Marine Invertebrates ◽  
Marine Invertebrate ◽  
Chemical Form ◽  
Weight Basis ◽  
Atomic Fluorescence Spectrometry ◽  
Atomic Fluorescence ◽  
Saltwater Fish ◽  
Relative Standard ◽  
Wet Weight

Total mercury, monomethylmercury (CH3Hg), and dimethylmercury ((CH3)2Hg) in edible muscle were examined in 229 samples, representing seven freshwater and eight saltwater fish species and several species of marine invertebrates using ultraclean techniques. Total mercury was determined by hot HNO3/H2SO4/BrClldigestion, SnCl2 reduction, purging onto gold, and analysis by cold vapor atomic fluorescence spectrometry (CVAFS). Methylmercury was determined by KOH/methanol digestion using aqueous phase ethylation, cryogenic gas chromatography, and CVAFS detection. Total mercury and CH3Hg concentrations varied from 0.011 to 2.78 μg∙g−1 (wet weight basis, as Hg) for all samples, while no sample contained detectable (CH3)2Hg (<0.001 μg∙g−1 as Hg). The observed proportion of total mercury (as CH3Hg) ranged from 69 to 132%, with a relative standard deviation for quintuplicate analysis of about 10%; nearly all of this variability can be explained by the analytical variability of total mercury and CH3Hg. Poorly homogenized samples showed greater variability, primarily because total mercury and CH3Hg were measured on separate aliquots, which vary in mercury concentration, not speciation. I conclude that for all species studied, virtually ail (>95%) of the mercury present is as CH3Hg and that past reports of substantially lower CH3Hg fractions may have been biased by analytical and homogeneity variability.

Measuring Marine Iron(III) Complexes by CLE-AdSV

2005 ◽  
Vol 2 (2) ◽  
pp. 80 ◽  
Author(s):  
Raewyn M. Town ◽  
Herman P. van Leeuwen
Keyword(s):  
Ligand Exchange ◽  
Essential Element ◽  
Stripping Voltammetry ◽  
Chemical Form ◽  
Kinetic Properties ◽  
Marine Systems ◽  
Dissolved Ions ◽  
Competitive Ligand Exchange ◽  
Concentration Limits ◽  
Kinetic Features

Environmental Context. Iron is an essential element for life in the world's oceans, and in some regions its concentration limits the growth of phytoplankton. The amount of iron(iii) which is available to an organism depends on the exact chemical form in which it exists, for example as dissolved ions or associated with organic compounds. There are widespread reports that marine iron(iii) is predominantly bound in extremely strong complexes. We show that such claims might be the result of an artefact of the measurement technique, CLE-AdSV. Ensuing ideas about the iron biogeochemistry in marine systems might require reconsideration as well. Abstract. Iron(iii) speciation data, as determined by competitive ligand exchange?adsorptive stripping voltammetry (CLE-AdSV), is reconsidered in the light of the kinetic features of the measurement. The very large stability constants reported for iron(iii) in marine ecosystems are shown to be possibly due to an artefact of the technique, arising from the assumption that equilibrium is achieved between all iron(iii) species of relevance. Particular kinetic properties, related to the special nature of hydroxide as a metal complexant, have the consequence that CLE-AdSV measurements of iron(iii) in seawater generally correspond to the hydroxide complexes only. By the same token, dissolved hydroxide complexes are the key components of the bioavailable iron(iii) pool. The analysis presented herein opens opportunities to exploit CLE-AdSV for more rigorous investigation of the links between the speciation and the bioavailability of iron(iii).

scholarly journals The chemical form of silicon in marine Synechococcus

2018 ◽  
Vol 206 ◽  
pp. 44-51 ◽  
Author(s):  
Daniel C. Ohnemus ◽  
Jeffrey W. Krause ◽  
Mark A. Brzezinski ◽  
Jackie L. Collier ◽  
Stephen B. Baines ◽  
...  
Keyword(s):  
Chemical Form

Temporal changes in tissue glutathione in response to chemical form, dose, and duration of selenium treatment

1991 ◽  
Vol 30 (2) ◽  
pp. 163-173 ◽  
Author(s):  
Henry J. Thompson ◽  
Clement Ip
Keyword(s):  
Temporal Changes ◽  
Chemical Form ◽  
Selenium Treatment

Laser ablation of synthetic geological powders using ICP-AES detection: effects of the matrix, chemical form of the analyte and laser wavelength

1999 ◽  
Vol 14 (4) ◽  
pp. 675-682 ◽  
Author(s):  
M. Motelica-Heino ◽  
O. F. X. Donard ◽  
J. M. Mermet
Keyword(s):  
Laser Ablation ◽  
Laser Wavelength ◽  
Chemical Form ◽  
The Matrix

Mercury levels and its chemical form in tissues and organs of seabirds

1996 ◽  
Vol 30 (2) ◽  
pp. 259-266 ◽  
Author(s):  
E. Y. Kim ◽  
T. Murakami ◽  
K. Saeki ◽  
R. Tatsukawa
Keyword(s):  
Chemical Form

Study on Electrochemical Hydrogen Storage of Multi-Walled Carbon Nanotubes

2007 ◽  
Vol 26-28 ◽  
pp. 831-834 ◽  
Author(s):  
Lei Xie ◽  
Xiao Qi Li
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Weight Percent ◽  
Chemical Form ◽  
Hydrogen Storage Capacity ◽  
Electrochemical Hydrogen Storage ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Discharging Capacity

The electrode(Ni-MWNTs) containing nickel(Ni) and multi-walled carbon nanotubes (MWNTs) was prepared by composite electrodeposit. Electrochemical hydrogen storage of the electrode was studied. The result showed a high electrochemical discharging capacity of up to 1361.1mA·h·g-1, which corresponds to a hydrogen storage capacity of 4.77Wt%(weight percent). Test of cyclic lifespan showed MWNTs had certain cyclic lifespan. Cyclic voltammetry tests showed that MWNTs can store hydrogen in chemical form.

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