scholarly journals Multi-elemental risk assessment of various baby rice cereals: some cause for concern?

2021 ◽  
Author(s):  
Nausheen W Sadiq ◽  
Diane Beauchemin
Keyword(s):  
Risk Assessment ◽  
Gastric Juice ◽  
Chromatographic Analysis ◽  
Speciation Analysis ◽  
Young Age ◽  
Dimethylarsinic Acid ◽  
Balanced Diet ◽  
Monomethylarsonic Acid ◽  
Online Methods

This study used batch and online methods to accurately determine how much As, Cr, Se, Cd, Pb, Cu, Fe, and Zn can be leached from baby rice cereals into a baby’s body. Speciation analysis of the saliva and gastric juice leachates was conducted in order to further assess the risk associated with the continued consumption of baby rice cereal for infants. A simple 15-min chromatographic analysis successfully separated 8 species consisting of As(III), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), As(V), Se(IV), Se(VI), (Cr(III)) and Cr(VI). Given that 95-100% As, 29-100% Cr, 62-100% Pb, 70-100% Se, 63-100% Cd, 36-100% Cu, 67-100% Fe, and 70-100% Zn were bio-accessible and the speciation analysis results showed all bio-accessible As and Se to be in the forms of As(V) and Se(VI) and 70-100% of Cr to be in the Cr(III) form, a variety of foods should be fed to infants rather than just baby rice cereal to ensure a well-balanced diet and less exposure to As at such a young age.

scholarly journals Sample Preparation and Storage Can Change Arsenic Speciation in Human Urine

1999 ◽  
Vol 45 (11) ◽  
pp. 1988-1997 ◽  
Author(s):  
Jörg Feldmann ◽  
Vivian W-M Lai ◽  
William R Cullen ◽  
Mingsheng Ma ◽  
Xiufen Lu ◽  
...  
Keyword(s):  
Human Urine ◽  
Arsenic Speciation ◽  
Speciation Analysis ◽  
Arsenic Species ◽  
Urine Samples ◽  
Dimethylarsinic Acid ◽  
Detection Techniques ◽  
Monomethylarsonic Acid ◽  
The Stability ◽  
And Storage

Abstract Background: Stability of chemical speciation during sample handling and storage is a prerequisite to obtaining reliable results of trace element speciation analysis. There is no comprehensive information on the stability of common arsenic species, such as inorganic arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid, dimethylarsinic acid, and arsenobetaine, in human urine. Methods: We compared the effects of the following storage conditions on the stability of these arsenic species: temperature (25, 4, and −20 °C), storage time (1, 2, 4, and 8 months), and the use of additives (HCl, sodium azide, benzoic acid, benzyltrimethylammonium chloride, and cetylpyridinium chloride). HPLC with both inductively coupled plasma mass spectrometry and hydride generation atomic fluorescence detection techniques were used for the speciation of arsenic. Results: We found that all five of the arsenic species were stable for up to 2 months when urine samples were stored at 4 and −20 °C without any additives. For longer period of storage (4 and 8 months), the stability of arsenic species was dependent on urine matrices. Whereas the arsenic speciation in some urine samples was stable for the entire 8 months at both 4 and −20 °C, other urine samples stored under identical conditions showed substantial changes in the concentration of As(III), As(V), monomethylarsonic acid, and dimethylarsinic acid. The use of additives did not improve the stability of arsenic speciation in urine. The addition of 0.1 mol/L HCl (final concentration) to urine samples produced relative changes in inorganic As(III) and As(V) concentrations. Conclusions: Low temperature (4 and −20 °C) conditions are suitable for the storage of urine samples for up to 2 months. Untreated samples maintain their concentration of arsenic species, and additives have no particular benefit. Strong acidification is not appropriate for speciation analysis.

scholarly journals Monitoring Arsenic Species Content in Seaweeds Produced off the Southern Coast of Korea and Its Risk Assessment

Environments ◽  
2020 ◽  
Vol 7 (9) ◽  
pp. 68
Author(s):  
Min-hyuk Kim ◽  
Junseob Kim ◽  
Chang-Hyun Noh ◽  
Seogyeong Choi ◽  
Yong-Sung Joo ◽  
...  
Keyword(s):  
Risk Assessment ◽  
South Korea ◽  
Arsenic Speciation ◽  
Arsenic Exposure ◽  
Inorganic Arsenic ◽  
Speciation Analysis ◽  
Arsenic Species ◽  
Dimethylarsinic Acid ◽  
Concentration Data ◽  
Seaweed Species

Seaweed, a popular seafood in South Korea, has abundant dietary fiber and minerals. The toxicity of arsenic compounds is known to be related to their chemical speciation, and inorganic arsenic (iAs) is more detrimental than other species. Due to the different toxicities of the various chemical forms, speciation analysis is important for evaluating arsenic exposure. In this study, total arsenic (tAs) and six arsenic species (arsenite, arsenate, monomethylarsonic acid, dimethylarsinic acid, arsenobetaine, and arsenocholine) were analyzed in 180 seaweed samples. Although there were differences between seaweed species, the concentration of tAs was detected at levels ranging from 1 to 100 µg/g, and the distribution of six arsenic species differed depending on the seaweed species. No correlation between the concentration of iAs and tAs was found in most seaweed species. Through statistical clustering, hijiki and gulfweed were seen to be the seaweeds with the highest ratios of iAs to tAs. Using the iAs concentration data from the arsenic speciation analysis, a risk assessment of seaweed intake in South Korea was conducted. The margin of exposure values showed no meaningful risk for the general population, but low levels of risk were identified for seaweed consumers, with high intakes of gulfweed and hijiki.

scholarly journals Speciation of Arsenic in Chicken Meat by Anion-Exchange Liquid Chromatography with Inductively Coupled Plasma-Mass Spectrometry

2004 ◽  
Vol 87 (1) ◽  
pp. 233-237 ◽  
Author(s):  
Aleksandra Polatajko ◽  
Joanna Szpunar
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Anion Exchange ◽  
Inductively Coupled Plasma ◽  
Speciation Analysis ◽  
Arsenic Species ◽  
Chicken Meat ◽  
Dimethylarsinic Acid ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

Abstract A method was developed for speciation analysis of arsenic in chicken meat. Different procedures were optimized for the recovery of arsenic compounds without destroying the original compounds, and 2 anion-exchange liquid chromatography columns were compared for the separation of arsenic species prior to on-line detection by inductively coupled plasma-mass spectrometry. The 2 species found were dimethylarsinic acid (106 ± 5 ng/g) and arsenobetaine (37 ± 4 ng/g). The stability of arsenic species in a chicken meat candidate reference material for at least 12 months was demonstrated.

Anaerobic Biotransformation of Organoarsenical Pesticides Monomethylarsonic Acid and Dimethylarsinic Acid

2006 ◽  
Vol 54 (11) ◽  
pp. 3959-3966 ◽  
Author(s):  
Reyes Sierra-Alvarez ◽  
Umur Yenal ◽  
Jim A. Field ◽  
Mike Kopplin ◽  
A. Jay Gandolfi ◽  
...  
Keyword(s):  
Dimethylarsinic Acid ◽  
Monomethylarsonic Acid ◽  
Anaerobic Biotransformation
Sign in / Sign up

Export Citation Format

Share Document