Mercuric iodide

inorganic compound

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Mercury iodide, a inorganic compound , chemical formula is HgI two 。 There are two variants, one is red mercuric iodide, four corners crystal , density 6.36g/cm three （25℃）。 It turns yellow at 127 ℃ and turns red when cooled. One is yellow mercuric iodide, orthogonal crystal, density 6.094g/cm three (127 ℃), melting point 259 ℃, boiling point 354 ℃, unstable at room temperature, after a few hours into a stable red variant. Insoluble in water, soluble in methanol 、 ethanol 、 Ether 、 chloroform 、 glycerol 、 acetone 、 carbon disulfide 、 Sodium thiosulfate Solution. It is used in medicine and as a chemical reagent.^[1]

Mercury iodide is an extremely rare iodine in nature Mercury ore (Cocinite).

On October 27, 2017, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization (WHO) was preliminarily collated for reference. Mercury and inorganic mercury compounds were included in the list of three types of carcinogens.^[4]

Chinese name: Mercuric iodide
Foreign name: mercuric iodide
Alias: Hypermercury iodide 、 Mercuric diiodide
chemical formula: HgI two
molecular weight: four hundred and fifty-four point three nine nine
CAS login number: 7774-29-0
EINECS login number: 231-873-8

Melting point: 259 ℃
Boiling point: 354 ℃
Water solubility: Insoluble
Density: 6.36 g/cm³
Appearance: Yellow or red crystalline powder
Security description: S13；S28；S45；S60；S61
Hazard description: R26/27/28；R33；R50/53

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Physical and chemical properties

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physical property

Density: 6.36g/cm three

Melting point: 259 ℃

Boiling point: 354 ℃

Appearance: yellow or red Crystallinity powder

Solubility : insoluble in water, soluble in methanol 、 ethanol 、 Ether 、 chloroform 、 glycerol 、 acetone 、 carbon disulfide^[5]

chemical property

1. It will turn brown when exposed to light for a long time, and is especially sensitive to blue light. It will decompose into Hg And I two 。 And potassium iodide Solution reaction can generate Potassium mercuric iodide 。^[2]

2. It turns yellow when heated to 130 ℃ and still turns red when cold.

3. In Hg 2+ Add I to the solution - When ions are added, red HgI is generated at first two precipitate ， I - In case of excess ion, colorless [HgI is generated four ] 2- Dissolve with ions (colorless).^[3]

toxicology data

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1. Acute toxicity

LD fifty ：18mg/kg（ Rat Oral); 75mg/kg (rat percutaneous)

2. Teratogenicity

The lowest inhalation toxic dose of female rats: 450ng/m three (24h), resulting in fetal toxicity: stillbirth, developmental disorder, etc.

3. Ecotoxicity

LC fifty ：0.156mg/L（18h）（ Red algae ）^[5]

purpose

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1. Preparation Nessler's reagent (Nesseler's) and Miller's reagent (Mayer's) to determine palladium.

2、 analytical chemistry For preparation on Nessler reagent And Meyer Alkaloid reagent For qualitative detection ammonium Ions And ammonia.^[2]

Reaction equation for testing ammonium ion with Nessler reagent^[3]

3. Used as semiconductor material 。

4. Used to operate at room temperature Gamma ray or X-ray Detection or imaging equipment.

5. In medicine, mercury iodide is used to treat Syphilis 。 stay veterinary medicine In the treatment Bone spur 、 Mucocele Large ointments contain mercury iodide.

Leakage treatment

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Emergency Management

Isolate leakage Contaminated Zone , access is restricted. Cut off the ignition source. proposal Emergency Management Self contained personnel respirator , wear Antivirus clothing 。 No direct contact Leakage. Small amount of leakage: avoid flying dust and use clean Shovel Collect in a dry, clean, covered container. Large leakage: use plastic sheeting Covering with canvas to reduce flying. Then collect, recycle or transport to waste disposal Site disposal.

Protective measures

respiratory system Protection: workers should wear hood type electric air supply filter type dust respirator. Wear an isolated respirator if necessary.

Eye protection: protection has been made in respiratory system protection.

Body protection: wear one-piece adhesive tape Antivirus clothing 。

Hand protection: wear Rubber gloves 。

Others: Smoking, eating and drinking are prohibited at the work site. After work, take a shower and change clothes. Store the clothes contaminated by poisons separately and use them after washing. Keep good hygiene habits.

First aid measures

Skin contact: Take off the contaminated clothes immediately and wash with plenty of flowing water for at least 15 minutes. Get medical attention.

Eye contact: immediately lift the eyelids and use plenty of flowing water or normal saline Thoroughly flush for at least 15 minutes. Get medical attention.

Inhalation: quickly leave the site to a place with fresh air. keep respiratory tract unobstructed. as dyspnea , give oxygen. as Apnea , perform artificial respiration immediately. Get medical attention.

Ingestion: induce vomiting. Use clean water or 2% sodium bicarbonate Solution gastric lavage（ contraindicated Normal saline), drink milk or egg white. Get medical attention.

Storage and transportation method

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Storage method: store in a cool and well ventilated special warehouse, and implement the system of "two people receiving and sending, two people keeping". Keep away from kindling and heat sources. Avoid light. Packing and sealing. It shall be stored separately from oxidants and edible chemicals, and mixed storage is strictly prohibited. Avoid contact Bromide 、 chloride , ammonia, alkali cyanide 、 Copper salt , lead salt Iodoform and hydrogen peroxide 。 The storage area shall be equipped with appropriate materials to contain leakage.

Transportation method: check before transportation Packaging container Whether it is complete and sealed, Transportation process The container shall not leak, collapse, fall or be damaged. It is forbidden to mix with acids, oxidants, food and food additives Mixed transportation. Transport vehicles shall be equipped with Leakage emergency treatment Equipment. During transportation, it shall be protected from sun exposure, rain and high temperature.

security information

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Safety terminology

S13 ：Keep away from food, drink and animal feeding stuffs.

Keep away from food, drinks and animal feed preservation.

S28：After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer).

After skin contact, immediately use a large amount of (designated by the manufacturer).

S45：In case of accident or if you feel unwell, seek medical advice immediately (show the lable where possible).

In case of an accident or feeling unwell, seek medical advice immediately (show the label if possible).

S60：This material and/or its container must be disposed of as hazardous waste.

The substance and its container must be used as Hazardous waste management.

S61：Avoid release to the environment. Refer to special instructions/Safety data sheets.

Avoid releasing into the environment, refer to special instructions/safety receipt instructions.

Risk terminology

R26/27/28：

Very toxic by inhalation, in contact with skin, and if swallowed.

R33：Danger of cumulative effects.

yes Cumulative effect DANGER.

R50/53：Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.

yes Aquatic organism Extremely toxic, possibly in Aquatic environment Medium to long term adverse effects.

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