MCPA

MCPA

2甲4氯

4-chloro-o-tolyloxyacetic acid

(4-chloro-2-methylphenoxy)acetic acid

94-74-6

C₉H₉ClO₃

Herbicides > Phenoxy herbicides

Herbicide

Tribenuron-methyl+MCPA-sodium
thiencarbazone+tribenuron+thifensulfuron+fluroxypyr+MCPA
Pyrazosulfuron-ethyl+MCPA-sodium+Carfentrazone-ethyl
Molinate+simetryn+MCPA-ethyl
Mesotrione+MCPA-sodium+Ametryn
MCPA-sodium+Pyrazosulfuron-ethyl
MCPA-sodium+Glyphosate ammonium+Fluroxypyr-meptyl
MCPA-sodium+Florasulam
MCPA-sodium+Dicamba
MCPA-sodium+chlorimuron-ethyl
MCPA-sodium+Carfentrazone-ethyl+Florasulam
MCPA-sodium+Carfentrazone-ethyl
MCPA-sodium+Bromoxynil octanoate
MCPA-isooctyl+Mesosulfuron-methyl+Florasulam
MCPA-isooctyl+Florasulam+Carfentrazone-ethyl
MCPA-isooctyl+Atrazine+Nicosulfuron
MCPA+Glyphosate
MCPA+Glufosinate-ammonium
MCPA+fluroxypyr
MCPA+dichlorprop-P+mecoprop-P
MCPA+Bromoxynil
MCPA+Amidosulfuron
MCPA+Ametryn+Diuron
Glyphosate-isopropylammonium+Mcpa-isopropylamine
Glyphosate ammonium+MCPA+Fluoroglycofen-ethyl
Florasulam+MCPA-isooctyl+fluroxypyr-meptyl
Florasulam+MCPA-isooctyl
Florasulam+MCPA ester
florasulam+fluroxypyr+MCPA
DIFLUFENICAN+MCPA ETHYL HEXYL ESTER
Bromoxynil octanoate+MCPA-isooctyl
Bensulfuron-methyl+MCPA-sodium
Potassium, sodium, dimethylamine salts (water soluble concentrates); isooctyl, isobutylesters (emulsifiable concentrates). Premix Parters: bifenox ioxynil; bifenox isoproturon; bifenox isoproturon neburon; bromoxynil dicamba; bromoxynil ioxynil; bromoxynil ioxynil isoproturon; bromoxynil MCPA; 2,4-D; 2,4-D dicamba; 2,4-D dicamba MSMA; 2,4-D dichlorprop; 2,4-D MCPA; dicamba; dicamba ioxynil; dicamba MCPA; dichlorprop MCPA; ioxynil; ioxynil isoproturon; isoproturon; MCPA;

White to light brown solid, flakes, crystal powder or liquid. Same as 2,4-D except for replacement of one chlorine atom by a methyl group. Molecular weight:200.6; Physical form:Colourless crystals; odourless, or with a mild phenolic odour. Density:1.41 (23.5 °C); Composition:Tech. grade is 85-99% pure. Melting point:114°-119°C; ( tech. 115-117 °C); Vapour pressure:2.3 ×10-2 mPa (20 °C); 4×10-1 mPa (32 °C); Henry constant:5.5×10-5 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 2.75 (pH 1), 0.59 (pH 5), -0.71 (pH 7) (25 °C); pKa:3.07; Solubility:In water 395 (pH 1), 26.2 (pH 5), 273.9 (pH 7), 320.1 (pH 9) (all in mg/l, 25 °C). In diethyl ether 770, toluene 26.5, xylene 49, heptane 5, methanol 775.6, dichlorometha; Stability:The acid is chemically very stable. Forms water-soluble alkali-metal and amine salts, although precipitation of calcium or magnesium salts may occur in hard water. Photochemical DT50 (artificial sunlight) 25.4 d (25 °C).;

(Rat): Oral LD₅₀ 900-1160 mg/kg; Inhalation LC₅₀ >6.36 mg/l. (Mouse): Oral 550 mg/kg. (Rabbit): Dermal LD₅₀ >4000 mg/kg. Pol-Chwastox Extra*: (Rat): Oral LD₅₀ 1914 mg/kg.Phytotoxicity:Phytotoxic to vines, vegetables, cotton, and ornamentals.

Ecotoxicology: Algae: EC₅₀ for Selenastrum capricornutum >392 mg/l.Bees:LD₅₀ 0.104 mg/bee.Birds:Acute oral LD₅₀ for bobwhite quail 377 mg/ kg.Daphnia: LC₅₀ >100 mg/l.Fish: LC₅₀ (96 h) for rainbow trout 232 mg/l.Worms:LD₅₀ (14 d) for Eisenia foetida 325 mg/ kg soil.Other aquatic spp.: LC₅₀ for pink shrimp (Panaeus duorarum) 231 mg/l. Environmental fate: Animals:In rats, following oral administration, MCPA is rapidly absorbed and excreted almost exclusively in the urine, with only a small proportion in the faeces. Only moderate metabolism occurs, and there is only a small amount of conjugate formation.Soil:In soil, degraded to 4-chloro-2-methylphenol, followed by ring hydroxylation and ring opening. DT₅₀ <7 d after initial lag phase. Duration of residual activity in soil is c. 3-4 mo, following an applicaPlant:In winter wheat, MCPA is hydroxylated at the methyl group with formation of 2-hydroxymethyl-4-chlorophenoxyacetic acid. This may be further degraded to the benzoic acid, prior to ring opening.

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)