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7440-38-2

Basic Information
CAS No.: 7440-38-2
Name: Arsenic
Article Data: 287
Molecular Structure:
Molecular Structure of 7440-38-2 (Arsenic)
Formula: As
Molecular Weight: 77.9454
Synonyms: Arsenicblack;Arsenic-75;Arsen;Arsenicals;Arsenicum album;CCRIS 55;Colloidal arsenic;Gray arsenic;Metallic arsenic;UNII-N712M78A8G;
EINECS: 231-148-6
Density: 5.727 g/cm3
Melting Point: 817 °C(lit.)
Boiling Point: 613 °C(lit.)
Solubility: Insoluble in water
Appearance: Grey powder or chunks
Hazard Symbols: ToxicT,DangerousN
Risk Codes: 23/25-50/53-36/38-22-45
Safety: 20/21-28-45-60-61-26-53
Transport Information: UN 1558 6.1/PG 2
PSA: 0.00000
LogP: -0.04330
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History

1. During the Bronze Age, arsenic was often included in bronze, which made the alloy harder . Albertus Magnus (Albert the Great, 1193–1280) is believed to have been the first European to isolate the element in 1250 by heating soap together with arsenic trisulfide. In 1649, Johann Schr?der published two ways of preparing arsenic.
2. In the Victorian era, "arsenic"  was mixed with vinegar and chalk and eaten by women to improve the complexion of their faces, making their skin paler to show they did not work in the fields.
3. The accidental use of arsenic in the adulteration of foodstuffs led to the Bradford sweet poisoning in 1858, which resulted in approximately 20 deaths and 200 people taken ill with arsenic poisoning.

Consensus Reports

IARC Cancer Review: Group 1 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 (1987),p. 100.(; Human Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 23 (1980),p. 39 ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 2 (1973),p. 48 . Reported in EPA TSCA Inventory. Arsenic and its compounds are on the Community Right-To-Know List.

Standards and Recommendations

OSHA PEL: TWA 0.01 mg(As)/m3; Cancer Hazard
ACGIH TLV: TWA 0.01 mg/m3; Confirmed Human Carcinogen; BEI: 35 μ (As)/L inorganic arsenic and methylated metabolites in urine
DFG MAK: DFG TRK: 0.2 mg/m3 calculated as arsenic in that portion of dust that can possibly be inhaled
NIOSH REL: CL 2 μg(As)/m3
DOT Classification:  6.1; Label: Poison

Analytical Methods

For occupational chemical analysis use OSHA: #ID-105 or NIOSH: Arsenic (Hydride AAS), 7900.

Specification

The Arsenic with CAS registry number of 7440-38-2 is also known as Arsenicum album. The IUPAC name and product name are the same. It belongs to product categories of Industrial/Fine Chemicals; Inorganics; Arsenic; Metal and Ceramic Science; Metals; A; AAS; AAS CRMsAlphabetic; AASSpectroscopy; Allergens; Application CRMs; AR to AZMethod Specific; Extractable Heavy metalsCosmetics; Oeko-Tex Standard 100; Spectroscopy. Its EINECS registry number is 231-148-6. In addition, the formula is As and the molecular weight is 74.92. This chemical is a grey powder or chunks and should be satored in cool, ventilated ang dry place without wet. What's more, it is mainly used for manufacturing carbide, glass, pharmaceutical, paint and pesticide.

Physical properties about Arsenic are: (1)Exact Mass: 74.921596; (2)MonoIsotopic Mass: 74.921596; (3)Heavy Atom Count: 1; (4)Covalently-Bonded Unit Count: 1.

Preparation of Arsenic: it is prepared by reaction of diarsenic trioxide with carbon. The reaction equipment has three electric devices, which are gasification section, reaction section and precipitation section. As carbon is placed in reaction section, diarsenic trioxide is placed in gasification section. Purified nitrogen is passed by speed of 400~500 ml/min. While gasification section is maintained at 400 °C and reaction section is 650 °C, precipitation section is maintained at 350~400 °C for 1 hour. At last, product is obtained by distillation.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating skin. It is toxic by inhalation and if swallowed. It even may cause cancer. Besides, it is very toxic to aquatic organisms that may cause long-term adverse effects in the aquatic environment. During using it, obtain special instructions before use in order to avoid release to the environment and do not eat, drink or smoke. This material and its container must be disposed of as hazardous waste. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If accident happens or you feel unwell seek medical advice immediately.
 
You can still convert the following datas into molecular structure:
1. SMILES: [AsH3]
2. InChI: InChI=1/As
3. InChIKey: RQNWIZPPADIBDY-UHFFFAOYAR
4. Std. InChI: InChI=1S/As
5. Std. InChIKey: RQNWIZPPADIBDY-UHFFFAOYSA-N

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
child TDLo oral 4mg/kg (4mg/kg) CARDIAC: EKG CHANGES NOT DIAGNOSTIC OF ABOVE

BLOOD: CHANGES IN LEUCOCYTE (WBC) COUNT
Pediatric Emergency Care. Vol. 13, Pg. 394, 1997.
guinea pig LDLo intraperitoneal 10mg/kg (10mg/kg) LIVER: FATTY LIVER DEGERATION

KIDNEY, URETER, AND BLADDER: OTHER CHANGES
Comptes Rendus des Seances de la Societe de Biologie et de Ses Filiales. Vol. 81, Pg. 164, 1918.
guinea pig LDLo subcutaneous 300mg/kg (300mg/kg)   Archivio di Science Biologiche Vol. 24, Pg. 442, 1938.
man TDLo oral 7857mg/kg/55Y (7857mg/kg) GASTROINTESTINAL: CHANGE IN STRUCTURE OR FUNCTION OF ESOPHAGUS

BLOOD: HEMORRHAGE

SKIN AND APPENDAGES (SKIN): "DERMATITIS, OTHER: AFTER SYSTEMIC EXPOSURE"
Canadian Medical Association Journal. Vol. 120, Pg. 168, 1979.
mouse LD50 intraperitoneal 46200ug/kg (46.2mg/kg) BEHAVIORAL: ATAXIA

GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA"
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 31(12), Pg. 53, 1987.
mouse LD50 oral 145mg/kg (145mg/kg) BEHAVIORAL: ATAXIA

GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA"
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 31(12), Pg. 53, 1987.
rabbit LDLo subcutaneous 300mg/kg (300mg/kg)   Archivio di Science Biologiche Vol. 24, Pg. 442, 1938.
rat LD50 intraperitoneal 13390ug/kg (13.39mg/kg)   Toxicology. Vol. 64, Pg. 191, 1990.
rat LD50 oral 763mg/kg (763mg/kg) BEHAVIORAL: ATAXIA

GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA"
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 31(12), Pg. 53, 1987.