The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

Jack F. Morgan - One of the best experts on this subject based on the ideXlab platform.

  • Organic Reactions - The Preparation of Aromatic Arsonic and Arsinic Acids by the Bart, Bechamp, and Rosenmund Reactions
    Organic Reactions, 2011
    Co-Authors: Cliff S. Hamilton, Jack F. Morgan
    Abstract:

    Arsonic acids may be regarded as derived from orthoArsenic acid, by replacement of one of the hydroxyl groups with an organic residue, the Arsenic acids are similarly derived by replacement of the two hydroxyl groups. The preparation of aromatic Arsenic acids is described in this chapter. The most widely used is the Bart reaction, which involves the interaction of a diazonium salt with an Inorganic Arsenic Compound. Arsenic acids are also obtained as by-products in the Bechamp synthesis. In the Rosenmund synthesis, salts of Arsenic acids are obtained by treatment of aryl halides with sodium or potassium arsenite. Keywords: aromatic Arsenic acid; arsinic acid; Bart reaction; Bechamp reaction; Rosenmund reaction; limitations; side reactions; procedures; arsonation

Mayumi Kishita - One of the best experts on this subject based on the ideXlab platform.

  • Degradation of organoArsenic Compounds by a hydrothermal or photo‐oxidation process
    Applied Organometallic Chemistry, 1999
    Co-Authors: Shigeru Maeda, Akira Ohki, Takanori Kawabata, Mayumi Kishita
    Abstract:

    The degradation of organoArsenic Compounds by a hydrothermal process and by photo-oxidation was studied. When 4-aminophenylarsonic acid (4-APA) was treated hydrothermally, almost complete degradation into an Inorganic Arsenic Compound (arsenate, IA) was attained by use of 1.0-3.0 M NaOH solution at 200°C. Phenylarsonic acid derivatives which had nitro or hydroxy substituents on the phenyl ring were rather more efficiently degraded than those with amino-substituents. Compared with phenylarsonic acid derivatives with those functional groups, phenylarsonic acid (PA) and dimethylarsinic acid (DMA) were hard to degrade. On the other hand, DMA was effectively degraded into IA by TiO 2 -catalyzed photo-oxidation, whereas for PA and 4-APA the photo-oxidation treatment was not efficient.

Shigeru Maeda - One of the best experts on this subject based on the ideXlab platform.

  • Degradation of organoArsenic Compounds by a hydrothermal or photo‐oxidation process
    Applied Organometallic Chemistry, 1999
    Co-Authors: Shigeru Maeda, Akira Ohki, Takanori Kawabata, Mayumi Kishita
    Abstract:

    The degradation of organoArsenic Compounds by a hydrothermal process and by photo-oxidation was studied. When 4-aminophenylarsonic acid (4-APA) was treated hydrothermally, almost complete degradation into an Inorganic Arsenic Compound (arsenate, IA) was attained by use of 1.0-3.0 M NaOH solution at 200°C. Phenylarsonic acid derivatives which had nitro or hydroxy substituents on the phenyl ring were rather more efficiently degraded than those with amino-substituents. Compared with phenylarsonic acid derivatives with those functional groups, phenylarsonic acid (PA) and dimethylarsinic acid (DMA) were hard to degrade. On the other hand, DMA was effectively degraded into IA by TiO 2 -catalyzed photo-oxidation, whereas for PA and 4-APA the photo-oxidation treatment was not efficient.

  • Biomethylation of Arsenic and its excretion by the alga Chlorella vulgaris
    Applied Organometallic Chemistry, 1992
    Co-Authors: Shigeru Maeda, Akira Ohki, Katsuhiro Kusadome, Hiroyuki Arima, Kensuke Naka
    Abstract:

    Experimental results in this paper lead to the following conclusions. (1) Cell homogenates of Chlorella vulgaris adsorbed the Inorganic Arsenic Compound Na2HAsO4 but no methylation of the Arsenic occurred in vitro. (2) A small part of the Arsenic bioaccumulated by C. vulgaris was methylated in vivo. The quantity of Arsenic methylated in the cell increased with an increase of Arsenic concentration in the medium. (3) When the Arsenic-accumulating cells were transferred into Arsenic-free media, the Arsenic was excreted and the relative quantity of the methylated Arsenic in the excrement was larger than that in the cell. (4) In the growth phase of C. vulgaris, a small fraction of the Arsenic accumulated in the cell was first transformed to monomethyl and dimethyl-Arsenic Compounds during the early exponential phase, and after a short time a fraction was transformed to trimethylArsenic species.

Mohan Devendra - One of the best experts on this subject based on the ideXlab platform.

  • Determination of Arsenic content in the Water and Blood samples of Ballia region using Hydride Generation Atomic Absorption Spectrophotometer
    2020
    Co-Authors: Chaurasia Neha, Mohan Devendra
    Abstract:

    In this research article the Arsenic contents was determined using HGAAS. The water and blood samples were collected from Ballia region, the samples were prepared for testing with the help of HGAAS. Arsenic in drinking water is the major cause of Arsenic toxicity. Most of the reports highlighted chronic Arsenic toxicity in man increases. In contrast Inorganic Arsenic Compound are known human carcinogens, based on sufficient evidence of carcinogenicity in human. From view point of health gastrointestinal effects, anemia, peripheral neuropathy, skin lesions, hyper pigmentation, and liver or kidney damage in humans. Inorganic Arsenic exposure in Human. By the inhalation has been shown to be strongly associated with lung cancer, while ingestion of Inorganic Arsenic in humans has been linked to a form of skin cancer and also to bladder, liver, and lung cancer. Hydride generation atomic absorption spectrometry (HGAAS) is highly specific technique, which is widely used for trace metal analysis, This HGAAS is stable, easy to operate and produces sufficient atomization to enable good sensitivity and freedom from much inter element interference is a very valid option for elemental analysis, with the help of this technique, it can be analyzed.

Cliff S. Hamilton - One of the best experts on this subject based on the ideXlab platform.

  • Organic Reactions - The Preparation of Aromatic Arsonic and Arsinic Acids by the Bart, Bechamp, and Rosenmund Reactions
    Organic Reactions, 2011
    Co-Authors: Cliff S. Hamilton, Jack F. Morgan
    Abstract:

    Arsonic acids may be regarded as derived from orthoArsenic acid, by replacement of one of the hydroxyl groups with an organic residue, the Arsenic acids are similarly derived by replacement of the two hydroxyl groups. The preparation of aromatic Arsenic acids is described in this chapter. The most widely used is the Bart reaction, which involves the interaction of a diazonium salt with an Inorganic Arsenic Compound. Arsenic acids are also obtained as by-products in the Bechamp synthesis. In the Rosenmund synthesis, salts of Arsenic acids are obtained by treatment of aryl halides with sodium or potassium arsenite. Keywords: aromatic Arsenic acid; arsinic acid; Bart reaction; Bechamp reaction; Rosenmund reaction; limitations; side reactions; procedures; arsonation