Arsenic organic

The toxicity of arsenicals conforms to the following order, from greatest to least toxicity arsines > inorganic arsenites > organic trivalent compounds (arsenoxides) > inorganic arsenates > organic pentavalent compounds > arsonium compounds > elemental arsenic. 

Generally, inorganic arsenic can occur in the environment in several forms but in natural waters and thus in drinking water, it is mostly found as trivalent arsenite or pentavalent arsenate. Organic arsenic species, abundant in seafood, are very much less harmful to health and are readily eliminated by the body5. 

Arsenate Poisoning Arsenate is structurally and chemically similar to inorganic phosphate (P4), and many enzymes that require phosphate will also use arsenate. Organic compounds of arsenate are less stable than analogous phosphate compounds, however. For example, acyl arsenates decompose rapidly by hydrolysis ... 

Table 4.1 Examples of arsenic compounds of environmental and biological interest. Inorganic arsenicals Organic arsenicals...

Arsenic-organic Herbicides MSMA, Cacodylic Acid... 

Use A fixed copper fungicide. Also micronutrient for plants. Compatible with arsenicals, organic insecticides, sulfur, and cryolite. Used as spray or dust. Does not inhibit photosynthesis. 

ARSENIC, ORGANIC COMPOUNDS (as As) (Organic arsenic compounds have variable molecular formulas and variable formula weights depending upon the specific organic arsenic compound. The mo-lecular formula for arsenic is As. Its corresponding formula weight is 74.92). 

DISPOSAL AND STORAGE METHODS arsenic organic corn-pounds should be disposed of in accordance with federal, state, and local regulations store in a cool, dry location keep in a well-ventilated room storage should be in well closed containers. 

Since the hydride technique only permits quantitative detection of arsenic which is present ionogenically in solution, decomposition is required for organic or complexed arsenic. Organically loaded water samples must also be decomposed before measurement. Two methods of decomposition are described below. 

In tissues of chondrichthyans (fish with a cartilaginous skeleton, such as sharks and rays), many species of marine fish (cod, flatfish, mackerel, herring, salmon and others), crustaceans (e.g. lobsters, shrimps and crabs) and molluscs (e.g. mussels and scallops), arsenobetaine is the main arsenic organic compound. 

CWS-4. funeral Method of Synthesis of Certain Non-Arsenical Organic Compounds Including Several Specific Compounds. 

Arsenic is a metalloid that belongs to group VA of the periodic table. It exists in three oxidation states metalloid (0), trivalent (-3 or -i- 3), and pentavalent (-1-5). The most common inorganic trivalent arsenic compounds are arsenic trioxide, sodium arsenite, and sodium trichloride. Pentavalent inorganic arsenic compounds are arsenic pentaoxide, arsenic acid, and arsenate (e.g., lead arsenate and calcium arsenate). In general, the toxicity of arsenic compounds is in the following order arsine > arsenites > arsenates > organic > elemental. 

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