ARSENIC SPECIATION IN SEDIMENT AND PORE WATERS OF THE HISTORICAL MINING-IMPACTED BELLE FOURCH AND CHEYENNE RIVER FLOODPLAINS

The purpose of the present study was to assess arsenic (As) speciation in rice from West Bengal, India, in order to improve understanding of the health risk posed by arsenic in Indian rice. Rice is a potentially important route of human exposure to arsenic, especially in populations with rice-based diets. However, arsenic toxicity varies greatly with species. Determination of arsenic (As) species in rice is necessary because inorganic As species are more toxic than organic As. Total arsenic was determined by inductively coupled plasma mass spectrometry; arsenite, arsenate, monomethylarsonic acid, and dimethyarsinic acid were quantified by high-performance liquid chromatography- inductively coupled plasma mass spectrometry. The analysis of a rice flour certified reference material (SRM-1568-a) were evaluated for quality assurance. The use of 2M TFA for extraction with an isocratic mobile phase was optimized for extraction and employed for arsenic speciation in rice. The extraction method showed a high recovery of arsenic. Most of the As species in rice were noticed to be inorganic [Arsenite (As-III), Arsenate As-V]. It appeared very clear from the present study that inorganic arsenic shared maximum arsenic load in rice straw while in grains it is considerably low. As species recovered from rice grain and straw are principally As-III and As-V with a little share of DMA and almost non-detectable MMA and As-B. The order of As species in rice grain revealed in this study were As-III (54.5-65.4 %)>As-V(21.2-28.3%)>DMA(5.2%).

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Fishing Cat Prionailurus viverrinus Bennett, 1833 (Carnivora: Felidae) distribution and habitat characteristics in Chitwan National Park, Nepal

Journal of Threatened Taxa ◽

10.11609/jott.3426.10.11.12451-12458 ◽

2018 ◽

Vol 10 (11) ◽

pp. 12451-12458 ◽

Cited By ~ 1

Author(s):

Rama Mishra ◽

Khadga Basnet ◽

Rajan Amin ◽

Babu Ram Lamichhane

Keyword(s):

National Park ◽

Buffer Zone ◽

Camera Trap ◽

Habitat Characteristics ◽

Oxbow Lakes ◽

River Floodplains ◽

Independent Events ◽

Awareness Programs ◽

Chitwan National Park ◽

Threaten Species

The Fishing Cat is a highly specialized and threatened felid, and its status is poorly known in the Terai region of Nepal. Systematic camera-trap surveys, comprising 868 camera-trap days in four survey blocks of 40km2 in Rapti, Reu and Narayani river floodplains of Chitwan National Park, were used to determine the distribution and habitat characteristics of this species. A total of 19 photographs of five individual cats were recorded at three locations in six independent events. Eleven camera-trap records obtained during surveys in 2010, 2012 and 2013 were used to map the species distribution inside Chitwan National Park and its buffer zone. Habitat characteristics were described at six locations where cats were photographed. The majority of records were obtained in tall grassland surrounding oxbow lakes and riverbanks. Wetland shrinkage, prey (fish) depletion in natural wetlands and persecution threaten species persistence. Wetland restoration, reducing human pressure and increasing fish densities in the wetlands, provision of compensation for loss from Fishing Cats and awareness programs should be conducted to ensure their survival. We also recommend studying genetic diversity of sub-populations, as well as habitat use by radio-tagging.

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Compaction of peat cover over desulfurized gold mine tailings changes: Arsenic speciation and mobility

Applied Geochemistry ◽

10.1016/j.apgeochem.2021.104923 ◽

2021 ◽

Vol 128 ◽

pp. 104923

Author(s):

T.V. Rakotonimaro ◽

M. Guittony ◽

C.M. Neculita

Keyword(s):

Mine Tailings ◽

Arsenic Speciation ◽

Gold Mine ◽

Gold Mine Tailings

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Hydrochemistry of sediment pore water in the Bratsk reservoir (Baikal region, Russia)

Scientific Reports ◽

10.1038/s41598-021-90603-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

V. I. Poletaeva ◽

E. N. Tirskikh ◽

M. V. Pastukhov

Keyword(s):

Pore Water ◽

Ionic Composition ◽

Water System ◽

Water Reservoir ◽

Environmental Parameters ◽

Water Area ◽

Pore Waters ◽

Overlying Water ◽

Major Ion ◽

Bratsk Reservoir

AbstractThis study aimed to identify the factors responsible for the major ion composition of pore water from the bottom sediments of the Bratsk water reservoir, which is part of the largest freshwater Baikal-Angara water system. In the Bratsk reservoir, the overlying water was characterized as HCO3–Ca–Mg type with the mineralization ranging between 101.2 and 127.7 mg L−1 and pore water was characterized as HCO3–SO4–Ca, SO4–Cl–Ca–Mg and mixed water types, which had mineralization varying from 165.9 to 4608.1 mg L−1. The ionic composition of pore waters varied both along the sediment depth profile and across the water area. In pore water, the difference between the highest and lowest values was remarkably large: 5.1 times for K+, 13 times for Mg2+, 16 times for HCO3−, 20 times for Ca2+, 23 times for Na+, 80 times for SO42−, 105 times for Cl−. Such variability at different sites of the reservoir was due to the interrelation between major ion concentrations in the pore water and environmental parameters. The major factor responsible for pore water chemistry was the dissolution of sediment-forming material coming from various geochemical provinces. In the south part of the reservoir, Cl−, Na+ and SO42− concentrations may significantly increase in pore water due to the effect of subaqueous flow of highly mineralized groundwater.

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An elemental and 87Sr/86Sr isotopic restitution of contaminated pore waters from sandy sediments of the Peciko gas field (Mahakam Delta, Indonesia)

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2021.108891 ◽

2021 ◽

pp. 108891

Author(s):

Norbert Clauer

Keyword(s):

Pore Waters ◽

Gas Field ◽

Sandy Sediments ◽

Mahakam Delta

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Importance of monitoring arsenic methylation metabolism in acute promyelocytic leukemia patients receiving the treatment of arsenic trioxide

Experimental Hematology and Oncology ◽

10.1186/s40164-021-00205-6 ◽

2021 ◽

Vol 10 (1) ◽

Author(s):

Yu Zheng ◽

Yuan-Fei Mao ◽

Hui-Jin Zhao ◽

Li Chen ◽

Li-Ning Wang ◽

...

Keyword(s):

Arsenic Trioxide ◽

Acute Promyelocytic Leukemia ◽

Arsenic Speciation ◽

Promyelocytic Leukemia ◽

Chronic Liver ◽

Dimethylarsinic Acid ◽

Metabolic Pattern ◽

Methylation Index ◽

Arsenic Methylation

Abstract Background Arsenic trioxide [ATO, inorganic arsenite (iAsIII) in solution] plays an important role in the treatment of acute promyelocytic leukemia (APL). However, the long-term adverse effects (AEs) and the retention of arsenic among APL patients are rarely reported. In this study, we focused on arsenic methylation metabolism and its relationship with chronic hepatic toxicity, as we previously reported, among APL patients who had finished the treatment of ATO. Methods A total of 112 de novo APL patients who had completed the ATO-containing treatment were enrolled in the study. Arsenic species [iAsIII, inorganic arsenate (iAsV), and their organic metabolites, monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA)] in patients’ plasma, urine, hair and nails were detected by high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry (HPLC-ICP-MS). Eighteen single nucleotide polymorphisms (SNPs) of the arsenic (+ 3 oxidative state) methylation transferase (AS3MT) gene, which was known as the main catalyzer for arsenic methylation, were tested with the polymerase chain reaction method. Results The study showed the metabolic pattern of arsenic in APL patients undergoing and after the treatment of ATO, in terms of total arsenic (TAs) and four species of arsenic. TAs decreased to normal after 6 months since cessation of ATO. But the arsenic speciation demonstrated significantly higher portion of iAsIII in patient’s urine (40.08% vs. 1.94%, P < 0.001), hair (29.25% vs. 13.29%, P = 0.002) and nails (30.21% vs. 13.64%, P = 0.003) than the healthy controls’, indicating a decreased capacity of arsenic methylation metabolism after the treatment of ATO. Urine primary methylation index (PMI) was significantly lower in patients with both chronic liver dysfunction (0.14 vs. 0.28, P = 0.047) and hepatic steatosis (0.19 vs. 0.3, P = 0.027), suggesting that insufficient methylation of arsenic might be related to chronic liver disorders. Two SNPs (A9749G and A27215G) of the AS3MT gene were associated with impaired urine secondary methylation index (SMI). Conclusions The long-term follow-up of arsenic speciation indicated a decreased arsenic methylation metabolism and a probable relationship with chronic hepatic disorders among APL patients after the cessation of ATO. Urine PMI could be a monitoring index for chronic AEs of ATO, and the SNPs of AS3MT gene should be considered when determining the dosage of ATO.

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