Monosodium methanearsonate

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  • Identifiers

    CAS number
    2163-80-6

    Molecular formula
    CH4AsNaO3

    SMILES
    C[As](=O)(O)[O-].[Na+]

    Safety labels

    Acute Toxic
    Acute Toxic

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 78.78%
    Sour 29.53%
    Sharp 20.3%
    Clean 17.56%
    Cheesy 15.39%
    Pungent 14.64%
    Sweaty 14.3%
    Milky 14.03%
    Dairy 13.56%
    Creamy 12.57%

     

    Flavor
    Odorless 65.21%
    Sour 40.5%
    Vinegar 32.22%
    Pungent 28.46%
    Acidic 25.4%
    Sharp 25.12%
    Bland 23.5%
    Formyl 21.95%
    Mousy 21.41%
    Soy 21.17%

     

  • Properties

    pKa est.
    3.36 (weak acid)

    Molecular weight
    161.952 g/mol

    Melting point expt.

    • 235 to 241 °F (NTP, 1992)
    • 130-140 °C
    • Mp: 113-116 °C /Sodium methanearsonate sesquihydrate/
    • Mp: 132-139 °C /Sodium methanearsonate hexahydrate/

    Boiling point

    • Decomposes (NTP, 1992)

    Flash point

    • 175.56 ˚C est.

    Solubility expt.

    • greater than or equal to 100 mg/mL at 72 °F (NTP, 1992)
    • 16 g/100 ml in methanol @ 25 °C; 0.005 g/100 ml in hexane @ 25 °C
    • Insoluble in most organic solvents
    • In water, 5.8X10+5 mg/l @ 20 °C.

  • Synonyms

    • 2163-80-6
    • Sodium methylarsonate
    • Monosodium methanearsonate
    • Daconate
    • MSMA
    • SODIUM METHANEARSONATE
    • Monosodium methylarsonate
    • Monate
    • Monosodium methanearsenate
    • Dal-E-Rad
    • Caswell No. 582
    • Ansar 6.6
    • Monosodium methane arsenate
    • Methanearsonic acid, monosodium salt
    • Sodium hydrogen methylarsonate
    • Arsonic acid, methyl-, monosodium salt
    • CCRIS 4676
    • HSDB 754
    • Methanearsonic acid monosodium salt
    • EINECS 218-495-9
    • EPA Pesticide Chemical Code 013803
    • UNII-600QCW45IV
    • 600QCW45IV
    • DTXSID2025686
    • Weed-Hoe
    • Monosodium acid methane arsonate sesquihydrate
    • METHANEARSONIC ACID MONOSODIUM SALT [MI]
    • Gepiron
    • Mesamate
    • Monoban
    • Bueno
    • Drexar
    • Merge
    • Phyban
    • Super Arsonate
    • Trans-vert
    • Herb-All
    • Herban M
    • Daconate 6
    • Mesamate H.C
    • Target MSMA
    • Methanearsonic acid, sodium salt
    • Bueno 6
    • METHANEARSONIC ACID, (SODIUM SALT)
    • METHANEARSONIC ACID, [SODIUM SALT]
    • Mesamate-400
    • Mesamate-600
    • Silvisar 550
    • Weed-hoe-108
    • Ansar 170L
    • Ansar 170
    • Ansar 529
    • Merge 823
    • Ansar 529 HC
    • Methylarsonic acid sodium
    • Weed 108
    • Dal-E-Rad 120
    • Sodium acid methanearsonate
    • Monosodium acid metharsonate
    • Monosodium methanearsonic acid
    • TransVert
    • HerbAll
    • Monosodium acid methanearsonate
    • DalERad
    • Methylarsenic acid, sodium salt
    • Methylarsonat monosodny [Czech]
    • Methylarsonic acid, sodium salt
    • Herban N
    • Monomethylarsonic acid sodium salt
    • NCI-C60071
    • Mesamate400
    • Mesamate600
    • Mesamate H.C.
    • Phyban H.C.
    • ARSONATE LIQUID
    • Methylarsonat monosodny
    • WeedHOE108
    • DalERad 120
    • Monosodium methyl arsenate
    • MSMA [HSDB]
    • monosodium methane arsonate
    • Pesticide Code 013803
    • SCHEMBL23266
    • sodium;hydroxy(methyl)arsinate
    • Methylarsonate, monosodium salt
    • DTXCID505686
    • DISODIUM METHANE ARSONATE
    • Arsonic acid, methyl, monosodium salt
    • monomethylarsonic acid, monosodium salt
    • HY-W714225
    • METHYLARSONIC ACID, MONOSODIUM SALT
    • NS00122534
    • Q3066718

  • Applications

    Monosodium methanearsonate is an organoarsenical herbicide used in agriculture as a selective weed control agent, particularly for grasses in turf management (such as golf courses and lawns) and in some field crops; it also serves as an intermediate in the synthesis of organoarsenical pesticides and related agrochemical formulations; in research and development settings it is evaluated for herbicidal activity and used as a reference compound for formulation studies; in analytical laboratories it is used as a reference standard for method development and regulatory testing; its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 553.93
    methanol 1152.62
    isopropanol 363.94
    water 1696.7
    ethyl acetate 57.76
    n-propanol 300.14
    acetone 569.57
    n-butanol 195.75
    acetonitrile 240.81
    DMF 1384.22
    toluene 25.9
    isobutanol 178.01
    1,4-dioxane 270.52
    methyl acetate 105.45
    THF 465.12
    2-butanone 157.06
    n-pentanol 128.32
    sec-butanol 164.79
    n-hexane 17.42
    ethylene glycol 713.05
    NMP 508.33
    cyclohexane 25.61
    DMSO 1055.76
    n-butyl acetate 44.0
    n-octanol 62.83
    chloroform 37.16
    n-propyl acetate 56.47
    acetic acid 360.01
    dichloromethane 58.05
    cyclohexanone 141.14
    propylene glycol 424.21
    isopropyl acetate 41.25
    DMAc 640.73
    2-ethoxyethanol 375.37
    isopentanol 118.34
    n-heptane 20.53
    ethyl formate 116.47
    1,2-dichloroethane 67.62
    n-hexanol 96.81
    2-methoxyethanol 769.85
    isobutyl acetate 34.64
    tetrachloromethane 14.55
    n-pentyl acetate 39.11
    transcutol 305.21
    n-heptanol 65.87
    ethylbenzene 14.77
    MIBK 66.75
    2-propoxyethanol 280.38
    tert-butanol 274.17
    MTBE 68.78
    2-butoxyethanol 165.09
    propionic acid 173.49
    o-xylene 27.08
    formic acid 689.25
    diethyl ether 102.87
    m-xylene 25.54
    p-xylene 19.3
    chlorobenzene 18.32
    dimethyl carbonate 107.49
    n-octane 7.75
    formamide 859.62
    cyclopentanone 246.05
    2-pentanone 113.68
    anisole 55.15
    cyclopentyl methyl ether 127.3
    gamma-butyrolactone 199.18
    1-methoxy-2-propanol 445.13
    pyridine 113.94
    3-pentanone 85.94
    furfural 229.49
    n-dodecane 5.9
    diethylene glycol 432.26
    diisopropyl ether 27.93
    tert-amyl alcohol 129.08
    acetylacetone 133.23
    n-hexadecane 6.15
    acetophenone 62.77
    methyl propionate 92.45
    isopentyl acetate 32.96
    trichloroethylene 56.39
    n-nonanol 54.77
    cyclohexanol 117.13
    benzyl alcohol 82.74
    2-ethylhexanol 41.18
    isooctanol 42.68
    dipropyl ether 66.81
    1,2-dichlorobenzene 17.62
    ethyl lactate 84.01
    propylene carbonate 83.99
    n-methylformamide 656.08
    2-pentanol 110.7
    n-pentane 28.15
    1-propoxy-2-propanol 173.44
    1-methoxy-2-propyl acetate 69.09
    2-(2-methoxypropoxy) propanol 123.08
    mesitylene 20.43
    ε-caprolactone 95.58
    p-cymene 17.54
    epichlorohydrin 176.45
    1,1,1-trichloroethane 27.87
    2-aminoethanol 641.29
    morpholine-4-carbaldehyde 493.57
    sulfolane 281.82
    2,2,4-trimethylpentane 7.09
    2-methyltetrahydrofuran 156.01
    n-hexyl acetate 47.29
    isooctane 6.81
    2-(2-butoxyethoxy)ethanol 174.71
    sec-butyl acetate 29.41
    tert-butyl acetate 48.33
    decalin 7.55
    glycerin 646.0
    diglyme 296.35
    acrylic acid 203.3
    isopropyl myristate 25.19
    n-butyric acid 115.43
    acetyl acetate 42.46
    di(2-ethylhexyl) phthalate 36.02
    ethyl propionate 50.0
    nitromethane 474.74
    1,2-diethoxyethane 78.36
    benzonitrile 46.79
    trioctyl phosphate 31.51
    1-bromopropane 34.46
    gamma-valerolactone 311.55
    n-decanol 43.07
    triethyl phosphate 33.16
    4-methyl-2-pentanol 54.51
    propionitrile 104.98
    vinylene carbonate 78.25
    1,1,2-trichlorotrifluoroethane 202.45
    DMS 44.58
    cumene 15.05
    2-octanol 38.22
    2-hexanone 74.14
    octyl acetate 37.0
    limonene 24.88
    1,2-dimethoxyethane 432.02
    ethyl orthosilicate 32.15
    tributyl phosphate 31.68
    diacetone alcohol 120.05
    N,N-dimethylaniline 74.14
    acrylonitrile 151.26
    aniline 71.54
    1,3-propanediol 454.84
    bromobenzene 12.66
    dibromomethane 39.87
    1,1,2,2-tetrachloroethane 55.93
    2-methyl-cyclohexyl acetate 36.64
    tetrabutyl urea 62.25
    diisobutyl methanol 28.91
    2-phenylethanol 64.96
    styrene 17.3
    dioctyl adipate 43.21
    dimethyl sulfate 170.44
    ethyl butyrate 43.26
    methyl lactate 160.76
    butyl lactate 59.07
    diethyl carbonate 32.83
    propanediol butyl ether 158.17
    triethyl orthoformate 41.84
    p-tert-butyltoluene 18.53
    methyl 4-tert-butylbenzoate 73.49
    morpholine 353.18
    tert-butylamine 155.89
    n-dodecanol 35.32
    dimethoxymethane 531.55
    ethylene carbonate 70.05
    cyrene 150.15
    2-ethoxyethyl acetate 52.09
    2-ethylhexyl acetate 25.82
    1,2,4-trichlorobenzene 21.31
    4-methylpyridine 84.19
    dibutyl ether 34.82
    2,6-dimethyl-4-heptanol 28.91
    DEF 170.15
    dimethyl isosorbide 165.63
    tetrachloroethylene 46.81
    eugenol 109.92
    triacetin 59.86
    span 80 106.63
    1,4-butanediol 242.4
    1,1-dichloroethane 39.84
    2-methyl-1-pentanol 67.41
    methyl formate 451.94
    2-methyl-1-butanol 110.86
    n-decane 8.35
    butyronitrile 93.22
    3,7-dimethyl-1-octanol 40.67
    1-chlorooctane 18.28
    1-chlorotetradecane 10.51
    n-nonane 8.38
    undecane 6.73
    tert-butylcyclohexane 6.62
    cyclooctane 11.28
    cyclopentanol 200.02
    tetrahydropyran 140.0
    tert-amyl methyl ether 56.33
    2,5,8-trioxanonane 240.9
    1-hexene 29.9
    2-isopropoxyethanol 190.45
    2,2,2-trifluoroethanol 235.77
    methyl butyrate 71.63

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction