Fenthion 倍硫磷

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倍硫磷

倍硫磷简介
中文名称 倍硫磷倍硫磷 分子式图片
[1]别名 百治屠; 倍硫磷乳油(50%); 蕃硫磷; O,O-二甲基-O-(3-甲基-4-甲硫基苯基)硫代磷酸酯; O,O-二甲基O-4-甲硫基-间-甲苯基硫杂磷酸酯; O,O-二甲基-O-4-甲硫基-间-甲苯基硫杂磷酸酯; O,O-二甲基-O-(4-甲硫基苯基)硫代磷酸酯
英文名称 fenthion
英文别名 O,O-dimethyl O-(4-methylthio-m-tolyl) phosphorothioate; LEBAYCID; LEBAYCID(R); FENCHEM; FASTER; ENTEX(R); ENT 25540; BEILIULIN
CAS NO. 55-38-9
EINECS 200-231-9
分子式 C10H15O3PS2
分子量 278.32
物理化学性质 密度1.25熔点7.5°C沸点87°C(0.01mmHg)水溶性0.0055g/100mL
产品用途 一种兼有接触和内吸性的广谱、速效、残效期长的杀虫剂

使用方法
倍硫磷对臭虫的作用
1. 倍硫磷实验证明是消灭臭虫效果最好的药物,操作之前把物品全部清理出来,搬至太阳下曝晒几小时。
2. 操作方法一般用倍硫磷卫生杀虫剂按1:80-100倍稀释,采用滞留喷洒或用旧毛笔,毛刷蘸取药液或粉剂,床板床架进行全面打湿打透 ,并对其他孳生场所如柜子,柜底,墙脚,缝隙等也进行药物处理。

倍硫磷对其它害虫的使用方法
1.水稻害虫的防治 二化螟、三化螟每亩用50%乳油75-150毫升加细土75--150千克制成毒土撒施或对水50--100千克喷雾。稻叶蝉、稻草飞虱可用相同剂量喷雾进行防治。
2.棉花害虫的防治 棉铃虫、红铃虫每亩用50%乳油50-100毫升,对水75--100千克喷雾。此剂量可兼治棉蚜、棉红蜘蛛。
3.蔬菜害虫的防治 菜青虫、菜蚜每亩用50%乳油50毫升,对水30--50千克喷雾。
4.果树害虫的防治 桃小食心虫用50%乳油1000-2000倍液喷雾。
臭虫特效药50%倍硫磷(1张)  5.大豆害虫的防治 大豆食心虫、大豆卷叶螟每亩用50%乳油50-150毫升,对水30--50千克喷雾。

注意事项
1.对十字花科蔬菜的幼苗及梨、桃、高粱、啤酒花易产生药害。
2.不能与碱性物质混用。
3.皮肤接触中毒可用清水或碱性溶液冲洗,忌用高锰酸钾液,误服治疗可用硫酸阿托品,但服用阿托品不宜太快、太早,维持时间一般应3-5天。

环境标准
中华人民共和国国家职业卫生标准GBZ2.1-2007 工作场所有害因素职业接触限值化学有害因素
倍硫磷的时间加权平均容许浓度PC-TWA 0.2mg/m3 ,短时间接触容许浓度PC-STEL 0.3mg/m3 。

 

 

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fenthion
Insecticide
IRAC 1B; organophosphate

  fenthion

NOMENCLATURE
Common name fenthion (BSI, E-ISO, (m) F-ISO, ESA, BAN); MPP (JMAF)
IUPAC name O,O-dimethyl O-4-methylthio-m-tolyl phosphorothioate
Chemical Abstracts name O,O-dimethyl O-[3-methyl-4-(methylthio)phenyl] phosphorothioate
CAS RN [55-38-9] EEC no. 200-231-9 Development codes Bayer 29 493; S 1752; E 1752 Official codes OMS 2; ENT 25 540

PHYSICAL CHEMISTRY
Mol. wt. 278.3 M.f. C10H15O3PS2 Form Colourless, oily liquid; (tech., brown, oily liquid, with a mercaptan-like odour). M.p. No solidification point down to -80 °C B.p. 90 °C/1 Pa (calc.), 117 °C/10 Pa (calc.), 284 °C (calc.) V.p. 0.74 mPa (20 ºC); 1.4 mPa (25 ºC) KOW logP = 4.84 Henry 5 ´ 10-2 Pa m3 mol-1 (20 °C) S.g./density 1.25 (20 ºC) Solubility In water 4.2 mg/l (20 ºC). In dichloromethane, toluene, isopropanol >250, hexane 100 (all in g/l, 20 ºC). Stability Stable to light, and up to 210 ºC. Relatively stable in acidic conditions, and moderately stable in alkaline conditions; DT50 (22 ºC) 223 d (pH 4), 200 d (pH 7), 151 d (pH 9). F.p. 170 ºC (tech.)

COMMERCIALISATION
History Developed by G. Schrader (Hoefchen-Briefe Engl. Ed., 1960, 1, 1) and introduced by Bayer AG in 1960. Patents DE 1116656; US 3042703 Manufacturers Bayer CropScience

APPLICATIONS
Biochemistry Cholinesterase inhibitor. Mode of action Insecticide with contact, stomach, and respiratory action. Uses Control of fruit flies, leafhoppers, leaf miners, leaf-eating larvae, stem borers, cereal bugs, and other insect pests in fruit (including citrus), vines, olives, vegetables, cotton, tea, sugar cane, rice, beet, tobacco, ornamentals, etc. For agricultural uses, application rates vary from 60 to 1200 g/ha, depending on crop, pest, pest stage and application method. Control of insect pests (flies, mosquitoes, cockroaches, fleas, ants, ticks, lice, etc.) in public health situations and animal houses, and control of animal ectoparasites. Phytotoxicity Non-phytotoxic when used as recommended. Some varieties of apples and cotton may be injured. Formulation types DP; EC; GR; HN; PO; UL; WP. Compatibility Incompatible with insecticides and fungicides which are highly alkaline. Selected products: 'Faster' (Sanonda); 'Lebaycid' (Bayer CropScience); 'Pilartex' (Pilarquim)

OTHER PRODUCTS
'Baycid' (Bayer CropScience); 'Baytex' (Bayer CropScience) Discontinued products: 'Entex' * (Bayer); 'Tiguvon' * (Bayer); 'Beiliulin' * (Shenzhen Jiangshan)

ANALYSIS
Product analysis by colorimetry of a derivative (F. B. Ibrahim & J. C. Cavagnol, J. Agric. Food Chem., 1966, 44, 369; CIPAC Handbook, 1983, 1B, 1830-1836); details from Bayer CropScience. Residues determined by glc (M. A. Luke et al., J. Assoc. Off. Anal. Chem., 1981, 64, 1187; A. Ambrus et al., ibid., p. 733; Anal. Methods Pestic. Plant Growth Regul., 1972, 6, 301). Methods for the determination of residues are available from Bayer CropScience.

MAMMALIAN TOXICOLOGY
Reviews FAO/WHO 80, 82 (see part 2 of the Bibliography). Oral Acute oral LD50 for male and female rats c. 250 mg/kg. Skin and eye Acute percutaneous LD50 (24 h) for male rats 586, female rats 800 mg/kg; not irritating to skin and eyes (rabbits). Inhalation LC50 (4 h) for male and female rats c. 0.5 mg/l air (aerosol). NOEL (2 y) for rats <5, mice 0.1 mg/kg diet; (1 y) for dogs 2 mg/kg diet. ADI (JMPR) 0.007 mg/kg b.w. [1995, 1997]. Toxicity class WHO (a.i.) II; EPA (formulation) II EC classification R68| T; R23, R48/25| Xn; R21/22| N; R50, R53

ECOTOXICOLOGY
Birds Acute oral LD50 for bobwhite quail 7.2 mg/kg. Dietary LC50 (5 d) for bobwhite quail 60, mallard ducks 1259 mg/kg. Fish LC50 (96 h) for bluegill sunfish 1.7, rainbow trout 0.83, golden orfe 2.7 mg/l. Daphnia EC50 (48 h) 0.0057 mg/l. Algae ErC50 for Scenedesmus subspicatus 1.79 mg/l. Bees LD50 (contact) 0.16 mg/bee. Worms LC50 for Eisenia foetida 375 mg/kg dry soil.

ENVIRONMENTAL FATE
EHC 63 (WHO, 1986; a general review of organophosphorus insecticides). Animals In mammals, following oral administration, elimination is mainly in the form of hydrolysis products in the urine. Major metabolites are fenthion sulfoxide, fenthion sulfone and their oxygen analogues. These metabolites are hydrolysed in further degradation, forming the corresponding phenols. Plants In plants, fenthion is oxidised to the sulfoxide and sulfone, both of which possess insecticidal properties, and to the monodesmethyl compound of fenthion sulfoxide. Further degradation occurs to the sulfone phosphate, which undergoes hydrolysis. Soil/Environment Koc 1500 (Ware, Rev. Environ. Contam. Toxicol., 123 (1992)). In sediment/water system with and without plants, DT50 is c. 1.5 d (O'Neill et al., Environ. Toxicol. Chem., 8, 759-768 (1989)). The degradation of fenthion occurs rapidly under aerobic conditions, forming the metabolites fenthion sulfoxide, fenthion sulfone, followed by the analogous phenol compounds.