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Arsenic

Arsenic structure

CAS No:
7440-38-2
Formula:
As
Chemical Name:
Arsenic
Synonyms:
Arsenic;Arsenic-75;Arsenic black;39277-51-5;55624-62-9
Categories:
Inorganic Chemistry > Elementary Substance

Description

Arsenic (As) is the third element in Group VA of the periodic table. Elemental arsenic can be found in two solid forms: yellow and gray or metallic, with specific gravities of 1.97 and 5.73, respectively (CRC, 1999). Gray arsenic is the ordinary stable form. Arsenic compounds can be categorized as inorganic and organic. Inorganic compounds do not contain an arsenic–carbon bond while organic compounds do.

Elemental arsenic, as, occurs to a limited extent in nature as a steel-gray,

Arsenic Basic Attributes

Molecular Weight：

77.95

Exact Mass：

77.94510

EC Number：

231-148-6

HScode：

2804800000

Characteristics

PSA：

XLogP3：

-0.04330

Appearance：

Silver to black powder

Density：

5.778 g/cm³ @ Temp: 25 °C

Melting Point：

613 °C (sublm)

Boiling Point：

615 °C

Water Solubility：

Insoluble

Vapor Pressure：

0 mmHg (approx)

Toxicity：

Oral-rat LD50: 763 mg/kg; Oral-Mouse LD50: 145 mg/kg

Flammability characteristics：

Dust is combustible; burning produces toxic arsenic fumes; contact with acids produces toxic fumes

Explosive limit：

SLIGHTLY EXPLOSIVE IN THE FORM OF DUST WHEN EXPOSED TO FLAME.

Odor：

... Odorless ...

Taste：

NEARLY TASTELESS

Safety Information

Packing level：

Hazard category：

6.1

Transport codes：

UN 1558 6.1/PG 2

wgk germany：

hazard class code：

23/25-50/53-36/38-22-45-52/53-51/53

safety instructions：

20/21-28-45-60-61-26-53

RTECS Number：

CG0525000

Marks：

T,N

Storage features：

The warehouse is ventilated, low temperature and dry; stored separately from food raw materials and oxidants

Explosive characteristics：

Dust can explode near fire; react violently in contact with oxides

Stability/Shelf Life：

Stable. Incompatible with acids, oxidizing agents, halogens. Heat and air-sensitive.

Precautionary statement(s)：

P261-P273-P301 + P310-P311-P501

Hazard Statements：

H301 + H331-H410

Toxicity

Toxicity class：

highly toxic

Arsenic Use and Manufacturing

Methods of Manufacturing

The gas-phase reduction method assembles three electric furnaces equipped with a gasification section, a reaction section, and a precipitation section. The central reaction part is a quartz tube with an inner diameter of 20 to 25 mm, filled with charcoal that is heated to remove the gas by vacuum, and plugged with quartz wool at both ends. Put arsenic trioxide in the quartz tray and put it in the gasification section to 400 The speed of ~500 mI/min passes through the purified nitrogen. Maintain the gasification section at 400°C, the reaction section at 650°C, and the precipitation section at 350-400°C. After the reaction for about 1 hour, the elemental arsenic is precipitated and then distilled to obtain the finished arsenic product.

Uses

In metallurgy for hardening copper, lead, nonferrous alloys; automotive body solder.In semiconductor materials.In the manufacture of low-melting glass.As wood preservative, herbicide, pesticide.

Material

Hydrogen

Carbon black

Hydrochloric acid

Downstream Products

Benzoic acid

Potassium iodide

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