Overview Physicochemical properties Synthesis Application Regulation Warning and toxicity References
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Iodomethane

Overview Physicochemical properties Synthesis Application Regulation Warning and toxicity References
Product Name
Iodomethane
CAS No.
74-88-4
Chemical Name
Iodomethane
Synonyms
CH3I;Iodmethan;Jodmethan;halon10001;Iodometano;Jod-methan;10domethane;Halon 10001;iodo-methan;Joodmethaan
CBNumber
CB9326765
Molecular Formula
CH3I
Formula Weight
141.94
MOL File
74-88-4.mol
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Iodomethane Property

Melting point:
−64(lit.)
Boiling point:
41-43 °C
Density 
2.28 g/mL at 25 °C(lit.)
vapor density 
4.89 (vs air)
vapor pressure 
24.09 psi ( 55 °C)
refractive index 
n20/D 1.530
Flash point:
−18 °F
storage temp. 
2-8°C
solubility 
water: soluble14g/L at 20°C
form 
Liquid
Specific Gravity
2.280
color 
Clear
Odor
Sweet, ethereal odor (no threshold data available); inadequate warning properties
PH
5.2 (H2O, 25℃)
Water Solubility 
14 g/L (20 ºC)
Sensitive 
Light Sensitive
Merck 
14,6087
BRN 
969135
Henry's Law Constant
5.06 at 21 °C (Gan and Yates, 1996)
Exposure limits
TLV-TWA 2 ppm (~11 mg/m3) (ACGIH), 5 ppm (MSHA and OSHA); carcinogenicity: Animal Limited Evidence (IARC), Suspected Human Carcinogen.
CAS DataBase Reference
74-88-4(CAS DataBase Reference)
IARC
3 (Vol. 41, Sup 7, 71) 1999
NIST Chemistry Reference
Methyl iodide(74-88-4)
EPA Substance Registry System
Methyl iodide (74-88-4)
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Safety

Hazard Codes 
T,F,Xn
Risk Statements 
21-23/25-37/38-40-11-39/23/24/25-23/24/25-38-20/22
Safety Statements 
36/37-38-45-9-24-16-7-60-36/37/39-33-23-20-4
RIDADR 
UN 2644 6.1/PG 1
WGK Germany 
1
RTECS 
PA9450000
8
TSCA 
Yes
HazardClass 
6.1
PackingGroup 
I
HS Code 
29033990
Hazardous Substances Data
74-88-4(Hazardous Substances Data)
Toxicity
LD50 orally in rats: 76 mg/kg; LD50 s.c. in mice: 0.78 mmoles/kg (IARC, 1986)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H225Highly Flammable liquid and vapour

H301Toxic if swalloed

H302Harmful if swallowed

H311Toxic in contact with skin

H312Harmful in contact with skin

H313May be harmful in contact with skin

H315Causes skin irritation

H317May cause an allergic skin reaction

H331Toxic if inhaled

H334May cause allergy or asthma symptoms or breathing difficulties if inhaled

H335May cause respiratory irritation

H351Suspected of causing cancer

H370Causes damage to organs

Precautionary statements

P201Obtain special instructions before use.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P281Use personal protective equipment as required.

P311Call a POISON CENTER or doctor/physician.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P405Store locked up.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
506052
Product name
Iodomethane solution
Purity
certified reference material, 2000?μg/mL in methanol: water (4:1)
Packaging
1 mL
Price
$28.3
Updated
2021/03/22
Sigma-Aldrich
Product number
289566
Product name
Iodomethane
Purity
contains copper as stabilizer,
Packaging
100g
Price
$93.1
Updated
2021/03/22
Sigma-Aldrich
Product number
IX0185
Product name
Iodomethane
Packaging
100 g
Price
$200.72
Updated
2021/03/22
Sigma-Aldrich
Product number
IX0185
Product name
Iodomethane
Packaging
500 g
Price
$575.35
Updated
2021/03/22
Sigma-Aldrich
Product number
289566
Product name
Iodomethane
Purity
contains copper as stabilizer,
Packaging
4x100g
Price
$304
Updated
2021/03/22
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Iodomethane Chemical Properties,Usage,Production

Overview

Iodomethane is also commonly called methyl iodide. It is a volatile liquid related to methane by replacement of hydrogen. Iodomethane is miscible with common organic solvents. It is colourless, although upon exposure to light, samples develop a purplish tinge. Iodomethane (methyl iodide) is widely used in organic synthesis to deliver a methyl group, via the transformation called methylation.[1]

Iodomethane(also known as methyl iodide), is a kind of alkyl halide. It is naturally emitted by rice plantations in small amounts. Algae are a great natural producer of it with annual output of being greater than 214,000 tons. Therefore, it exists in ocean in large amount. Terrestrial fungi and bacteria also produce certain amount of iodomethane[2, 3]. It is used in organic synthesis as a source of methyl groups.
Methyl iodide had been approved for use as a pesticide by the United States Environmental Protection Agency in 2007 as a pre-plant biocide used to control insects, plant parasitic nematodes, soil borne pathogens, and weed seeds in vegetables such as. It was registered for use as a pre-plant soil treatment for field grown strawberries, peppers, nut crops, tomatoes, grape vines, ornamentals and turf and nursery grown strawberries, stone fruits, tree nuts, and conifer trees. After the discovery phase in a consumer lawsuit, the manufacturer withdrew the fumigant citing its lack of market viability[4].

Physicochemical properties

Iodomethane, an alkyl halide, is a colorless to pale yellow liquid with an acrid odor. It is stable at room temperature in sealed containers, non-corrosive to metals, and incompatible with strong oxidizing and reducing agents. On exposure to light and moisture, the color turns yellow, red or brown due to decomposition and the liberation of free iodine. When heated to decomposition in air at 270 degree, toxic iodine vapors are emitted. Iodomethane is soluble in water, and is miscible with alcohol and ether[5-7].

Synthesis

Iodomethane can be synthesized by the following several methods[8]:
I. The reaction between methanol with phosphorus triiodide
II. The reaction of dimethyl sulfate with potassium iodide in the presence of calcium carbonate
III. The reaction of methanol with aqueous hydrogen iodide.
IV. The reaction of iodoform with potassium hydroxide and dimethyl sulfate in the presence of ethanol.

Application

Iodomethane is a useful methylating agent that mediates the alkylation of carbon, oxygen, sulfur, nitrogen and phosphorus nucleophiles[9, 10]. For example, phenol reacts with methyl iodide to give anisole. In the Monsanto process, the in situ formed iodomethane reacts with carbon monoxide in the presence of a rhodium complex to give acetyl iodide, which on hydrolysis yields acetic acid[11]. It reacts with magnesium to form the Grignard reagent, methyl-magnesium iodide used in organic synthesis[12]. It also finds applications as an intermediate in the manufacture of pharmaceuticals and in phase-transfer catalysts.
Methyl iodide can also be used as a kind of pesticide used to control insects, plant parasitic nematodes, soil borne pathogens, and weed seeds in vegetables. It can be used in the field growing strawberries, peppers, nut crops, tomatoes, grape vines, ornamentals and turf and nursery growing strawberries, stone fruits, tree nuts, and conifer trees. Its fumigant action is thought to be via the nucleophilic displacement(SN2) reaction in various amino acids and peptides within target organisms. It can also be used as a fire extinguisher[4, 5, 13, 14].

Regulation

Methyl bromide is scheduled for elimination as a soil fumigant and iodomethane has been proposed as an alternative[15-18]. Based on the atmospheric lifetime, global warming potential, and ozone depletion potential, the U.S. Environmental Protection Agency(USEPA) has identified iodomethane as a reduced risk alternative to methyl bromide.
In October, 2007, the USEPA issued a one year time-limited registration of iodomethane. In April 2009, USEPA extended conditional registration of iodomethate without specifying any time limits. The USEPA website provides details of the registration[19]. An application for California registration is currently being evaluated by DPR. Due to its acute toxicity, proposed products containing iodomethane are labeled as restricted use pesticides.

Warning and toxicity

Iodomethane may have certain toxicity when exposure to human and animals[20-22]. In humans, acute[short-term] exposure when inhaling iodomethane may depress the central nervous system(CNS), irritate the lungs and skin, and affect the kidneys[20]. Massive acute inhalation exposure to methyl iodide has led to pulmonary edema. Acute inhalation exposure of humans to methyl iodide has resulted in nausea, vomiting, vertigo, ataxia, slurred speech, drowsiness, skin blistering, and eye irritation[20, 21]. Chronic(long-term) exposure of humans to methyl iodide by inhalation may affect the CNS and cause skin burns in animals and humans. EPA has not classified methyl iodide for potential carcinogenicity[20-22].

References

  1. K. R. Redeker; N.-Y. Wang; J. C. Low; A. McMillan; S. C. Tyler & R. J. Cicerone[2000]. "Emissions of Methyl Halides and Methane from Rice Paddies". Science. 290[5493]: 966–969. doi:10.1126/science.290.5493.966.
  2. https://www.sfgate.com/green/article/Methyl-iodide-gains-state-OK-for-use-on-crops-2455128.php
  3. https://www.mercurynews.com/2012/03/20/maker-of-methyl-iodide-scraps-controversial-pesticide/ https://sitem.herts.ac.uk/aeru/ppdb/en/Reports/1233.htm
  4. Keigwin, Richard P. "Iodomethane; Notice of Receipt of Request to Voluntarily Cancel Iodomethane Pesticide Registrations and Amend a Registration." Federal Register[2012].
  5. DPR. 2002a. Product chemistry #1. Volume No. 52875-4, Department of Pesticide Regulation, Registration Branch, Sacramento, California. 
  6. Meister, R.T., ed. 2004. Crop protection handbook. Meister Publishing Company, Willoughby. 
  7. O’Neil, M.J. 2001. The Merck index, 13th ed. Merck & Co., Whitehouse Station, New Jersey. 
  8. http://www.orgsyn.org/demo.aspx?prep=CV2P0399
  9. Sulikowski, Gary A., and M. M. Sulikowski. Iodomethane. e-EROS Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons, Ltd, 2005.
  10. Erk, B.; Boll, R., Trippel, S.; Anielski, D.; Foucar, L.; Rudek, B.; Rudenko, A. Imaging charge transfer in iodomethane upon x-ray photoabsorption. Science 2014, 345[6194], 288-291.
  11. Dong, Y.; Brooks, J. D.; Chen, T. L.; Mullins, D. R.; Cox, D. F. Reactions of methyl groups on a non-reducible metal oxide: The reaction of iodomethane on stoichiometric alpha-Cr 2 O 3[0001]. Surf. Sci. 2015, 641, 148-153.
  12. Bodewitz, H. W. J. J., et al. "The formation of grignard compounds—V: The reaction of iodomethane with magnesium in allyl phenyl ether. A second-order cidnp spectrum." Tetrahedron 34.16(1978]: 2523-2527.
  13. https://sitem.herts.ac.uk/aeru/ppdb/en/Reports/1233.htm
  14. G.D. Clayton and F.E. Clayton, Eds. Patty's Industrial Hygiene and Toxicology. Volume IIB. 3rd revised ed. John Wiley & Sons, New York. 1981.
  15. Ohr, H.D., J.J. Sims, N.M. Grech, J.O. Becker, and M.E. Mcgriffen. 1996. Methyl iodide, an ozone-safe alternative to methyl bromide as a soil fumigant. Plant Dis. 80(7]: 731-735.
  16. Sims, J.J., N.M. Grech, J.O. Becker, M.E. McGiffen, and H.D. Ohr. 1995. Methyl iodide: a potential alternative to methyl bromide. Page 46 in Proc. Of the Second Annual Int. Res. Conf. On Methyl Bromide Alternatives and Emissions Reductions, San Diego. 6-8 Nov. 1995. Methyl Bromide Alternative Outreach, Fresno, CA.
  17. U.S. Environmental Protection Agency. 1993. Protection of stratospheric ozone. RED. Reg. 58(51]:15014-15049.
  18. The United Nations Environmental Programmes. 1995. The Montreal protocol on substances that deplete the ozone layer. 1994 Report of the Methyl Bromide Technical Option Committee. UNEP, Nairobi, Kenya.
  19. http://www.epa.gov/pesticides/factsheets/iodomethane_fs.htm
  20. M. Sittig. Handbook of Toxic and Hazardous Chemicals and Carcinogens. 2nd ed. Noyes Publications, Park Ridge, NJ. 1985.
  21. The Merck Index. An Encyclopedia of Chemicals, Drugs, and Biologicals. 11th ed. Ed. S. Budavari. Merck and Co. Inc., Rahway, NJ. 1989.
  22. https://www.epa.gov/sites/production/files/2016-09/documents/methyl-iodide.pdf

Chemical Properties

light yellow to light pink liquid

Chemical Properties

Methyl iodide is a colorless liquid. Pungent, ethereal odor. Turns yellow, red, or brown on exposure to light and moisture.

Physical properties

Clear, colorless liquid which may become yellow, red, or brown on exposure to light and moisture

Uses

Methyl iodide is used in the analysis of pyridine; microscopy; as an embedding materialfor examining diatoms (Merck 1996); and asa methylating agent.

Uses

.Iodomethane is an approved pesticide used to control insects, plant parasitic nematodes, soil borne pathogens and weed seeds.

Uses

Methylating agent; in microscopy because of its high refractive index; as imbedding material for examining diatoms; in testing for pyridine. Light sensitive etching agent for electronic circuits; component in fire extinguishers.

Definition

ChEBI: A member of the class of iodomethanes that is methane in which one of the hydrogens is replaced by iodine.

Definition

(methyl iodide; CH3I) A liquid alkyl halide made by reaction of methanol with iodine in the presence of red phosphorus.

Production Methods

Methyl iodide has had very limited use as a chemical intermediate (methylations), and in microscopy because of its high refractive index, as imbedding materials for examining diatoms, and in tests for pyridine. It has been proposed as a fire extinguisher and insecticidal fumigant. It is a product of natural biological processes. Methyl iodide is a currently registered pesticide.

General Description

A colorless liquid that turns brown on exposure to light. Denser than water. Contact may irritate skin, eyes and mucous membranes. Very toxic by ingestion, inhalation and skin absorption.

Air & Water Reactions

Soluble in water. Sinks and slowly decomposes in water forming poisonous vapor cloud of HI.

Reactivity Profile

Halogenated aliphatic compounds, such as Iodomethane, are moderately or very reactive. Reactivity generally decreases with increased degree of substitution of halogen for hydrogen atoms. Low molecular weight haloalkanes are highly flammable and can react with some metals to form dangerous products. Materials in this group are incompatible with strong oxidizing and reducing agents. Also, they are incompatible with many amines, alkylphosphines, nitrides, azo/diazo compounds, alkali metals (sodium), and epoxides.

Hazard

Toxic by ingestion, inhalation, and skinabsorption; narcotic, irritant to skin. Eye damageand central nervous system impairment. Question-able carcinogen.

Health Hazard

The acute toxicity of methyl iodide is moderate by ingestion, inhalation, and skin contact. This substance is readily absorbed through the skin and may cause systemic toxicity as a result. Methyl iodide is moderately irritating upon contact with the skin and eyes. Methyl iodide is an acute neurotoxin. Symptoms of exposure (which may be delayed for several hours) can include nausea, vomiting, diarrhea, drowsiness, slurred speech, visual disturbances, and tremor. Massive overexposure may cause pulmonary edema, convulsions, coma, and death.
Chronic exposure to methyl iodide vapor may cause neurotoxic effects such as dizziness, drowsiness, and blurred vision. There is limited evidence for the carcinogenicity of methyl iodide to experimental animals; it is not classified as an OSHA "select carcinogen."

Health Hazard

Inhalation of vapor causes lung congestion and pulmonary edema. Higher concentrations causes rapid narcosis and death. Contact with liquid irritates eyes and burns skin.

Health Hazard

The acute oral toxicity and inhalation toxicity of methyl iodide is moderate in test animals. It is more toxic than methyl bromide.The toxic symptoms are nausea, vomiting,diarrhea, ataxia, drowsiness, slurred speech,visual disturbances, and tremor. Pulmonaryedema, coma, and death can result from massive exposures. The vapors are an irritantto the eyes. Repeated exposures may causedepression of the central nervous system.Prolonged contact with the liquid can causeskin burn and dermatitis. The reported valuesof LD50, as well as LC50, for this compoundas published in the literature show variations.The fatal doses by inhalation and ingestionare 900 ppm/h in mice and 150 mg/kg inrats, respectively (Buckell 1950)
.Methyl iodide exhibited carcinogenic pro perties in test animals. Administration of thiscompound produced tumors in lungs andcolon. ACGIH (1986) lists it as a suspectedhuman carcinogen.

Fire Hazard

Noncombustible. High vapor pressure may cause containers to burst at elevated temperatures.

Flammability and Explosibility

Noncombustible. High vapor pressure may cause containers to burst at elevated temperatures.

Safety Profile

Confirmed carcinogen with experimental neoplastigenic and tumorigenic data. A poison by ingestion, intraperitoneal, and subcutaneous routes. Moderately toxic by inhalation and skin contact. A human skin irritant. Human mutation data reported. A strong narcotic and anesthetic. Explosive reaction with trialkylphosphines, silver chlorite. Violent reaction with oxygen (at 3000C), sodium. When heated to decomposition it emits toxic fumes of I-.

Potential Exposure

Methyl iodide is used in fire extinguishers; as an intermediate in the manufacture of pharmaceuticals and some pesticides.

Carcinogenicity

Druckrey et al. reported local sarcomas following weekly subcutaneous injection in BD strain rats. Strain A mice (a susceptible strain) that were injected with methyl iodide were reported to have a slight but significant increase in the number of lung tumors per mouse. Poirer et al. administered iodomethane dissolved in tricaprylin to male and female strain A mice (10/sex/dose) three times weekly by intraperitoneal injection. There was a marginally statistically significant trend for increased lung tumors in treated mice but the outcome was considered equivocal: no clear dose–response relationship and occurrence of spontaneous tumors in untreated mice.
Under the 2005 Guidelines for Carcinogen Risk Assessment (121), the lack of available evidence suggests that there is “inadequate information to assess the carcinogenic potential for iodomethane.”
An early evaluation by the IARC classified iodomethane as carcinogenic in rats. Two subsequent evaluations (123, 124) determined that there is limited evidence for carcinogenicity in experimental animals and the compound is not classifiable regarding carcinogenicity to humans. ACGIH has also reviewed iodomethane carcinogenicity and classified it as category A2, suspected human carcinogen; however, the A2 classification was withdrawn in 1996. Iodomethane was delisted as a carcinogen in the NTP 5th Annual Report on Carcinogens on the basis of the 1986 IARC reevaluation. NTP has not tested iodomethane for carcinogenicity. The State of California determined under Proposition 65 that methyl iodide is a carcinogen, based on the 1977 IARC evaluation. Neither a Toxicological Profile nor an Environmental Health Criteria Monograph has been published.

Environmental Fate

Chemical/Physical. Anticipated products from the reaction of methyl iodide with ozone or OH radicals in the atmosphere are formaldehyde, iodoformaldehyde, carbon monoxide, and iodine radicals (Cupitt, 1980). With OH radicals, CH2, methyl radical, HOI and water are possible reaction products (Brown et al., 1990). The estimated half-life of methyl iodide in the atmosphere, based on a measured rate constant for the vapor phase reaction with OH radicals, ranges from 535 h to 32 wk (Garraway and Donovan, 1979).
Hydrolyzes in water forming methyl alcohol and hydriodic acid. The estimated half-life in water at 25 °C and pH 7 is 110 d (Mabey and Mill, 1978). At 70 °C, the hydrolysis rate was determined to be 3.2 x 10-5/sec which is equivalent to a half-life of 6 h. (Glows and Wren, 2003). May react with chlorides in seawater to form methyl chloride (Zafiriou, 1975).

Shipping

UN2644 Methyl iodide, Hazard Class: 6.1; Labels: 6.1-Poison Inhalation Hazard, Inhalation Hazard Zone B

Purification Methods

Methyl iodide deteriorates rapidly with liberation of iodine if exposed to light. It is usually purified by shaking with dilute aqueous Na2S2O3 or NaHSO3 until colourless, then washing with water, dilute aqueous Na2CO3, and more water, drying with CaCl2 and distilling. It is stored in a brown bottle away from sunlight in contact with a small amount of mercury, powdered silver or copper. (Prolonged exposure of mercury to methyl iodide forms methylmercuric iodide.) Methyl iodide can be dried further using CaSO4 or P2O5. An alternative purification is by percolation through a column of silica gel or activated alumina, then distillation. The solution can be degassed by using a repeated freeze-pump-thaw cycle. [Beilstein 1 IV 87.]

Incompatibilities

May form explosive mixture with air. Slowly reacts with water forming poisonous hydrogen iodide. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Violent reaction with strong oxidizers, strong reducing agents, strong bases; trialkylphosphines, silver chlorite; calcium, oxygen, sodium. Decomposes @ 270C. Halogenated aliphatic compounds are moderately or very reactive. Halogenated organics generally become less reactive as more of their hydrogen atoms are replaced with halogen atoms. Low molecular weight haloalkanes are highly flammable and can react with some metals to form dangerous products. Materials in this group are incompatible with strong oxidizing and reducing agents. Also, they are incompatible with many amines, alkylphosphines, nitrides, azo/diazo compounds, alkali metals (sodium), and epoxides

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal

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Iodomethane Suppliers

Wuhan Wenjin Chemical Technology Co., Ltd.
Tel
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375665891@qq.com
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China
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Shanghai Song Yuan Chemical Technology Co., Ltd.
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010-1234567
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86-021-33275113
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ShangHai Siyan Biological Technology Co., Ltd.
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Manac (SHANGHAI) TRADING CO., LTD
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021-32503616
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Jiaxing Deyi Chemical Co., Ltd.
Tel
0573-85866609- ;
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Chongqing Yuzhiquan Biological Technology Co., Ltd.
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023-18306022-109;023-13098782-745
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ChemStrong Scientific Co.,Ltd
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Shanghai Nuohey Chemical Co., Ltd.
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View Lastest Price from Iodomethane manufacturers

Baoji Guokang Bio-Technology Co., Ltd.
Product
Iodomethane 74-88-4
Price
US $63.00/KG
Min. Order
25Kg/Drum
Purity
99%
Supply Ability
100T
Release date
2021-06-02
Baoji Guokang Healthchem co.,ltd
Product
Iodomethane 74-88-4
Price
US $87.30/KG
Min. Order
1KG
Purity
99%
Supply Ability
2000kg
Release date
2021-06-07
Hebei Guanlang Biotechnology Co., Ltd.
Product
Iodomethane 74-88-4
Price
US $1.00/PCS
Min. Order
1KG
Purity
99%
Supply Ability
10 mt
Release date
2021-07-28

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