Txheej txheem cej luam

DEET (lus Askiv diethylmethylbenzamide), luv ua DEET, lub npe tshuaj yog diethyltoluamide, yog ib qho tshuaj tua kab dav dav. Nws muaj cov nyhuv tua kab rau ntau yam kab tom hauv ntau qhov chaw thiab tuaj yeem tua cov kab uas tom. Cov yoov, cov kab midges, cov yoov dub, cov yoov chiggers, cov yoov mos lwj, cov yoov, cov yoov gnats, cov yoov nees, cov yoov xuab zeb, cov yoov gnats, cov yoov ruaj khov thiab cov kab laum.

DEET tau tsim thiab tau txais daim ntawv pov thawj los ntawm US Department of Agriculture thaum Tsov Rog Thoob Ntiaj Teb Zaum Ob. Cov khoom no tau raug xaiv los ua cov khoom tua yoov tshaj cum rau cov tub rog Asmeskas siv xyoo 1946. Nws tau sau npe nrog US Environmental Protection Agency ua cov tshuaj tua kab hauv xyoo 1957 thiab pib siv rau pej xeem siv. Thaum xub thawj nws tau siv ua tshuaj tua kab hauv cov liaj teb. Tom qab ntawd, tsoomfwv Meskas tau thov kom siv nws thaum muaj kev ua tsov rog, tshwj xeeb tshaj yog hauv Nyab Laj thiab Sab Qab Teb Asia. Raws li US Environmental Protection Agency cov ntaub ntawv, txhua xyoo Chemicalbook Yuav luag 40% ntawm cov neeg Asmeskas siv cov tshuaj tua kab uas muaj DEET, uas kwv yees li 200 lab tus tib neeg thoob ntiaj teb siv. Tau 40 xyoo dhau los, kev tshawb fawb los ntawm ntau dua 20,000 chav tshawb fawb tau ua pov thawj tias DEET yog cov tshuaj tua kab uas muaj kev nyab xeeb tshaj plaws thiab zoo tshaj plaws hauv kev ua lag luam. Cov tshuaj tua kab dav dav. Lub Koom Haum Kev Noj Qab Haus Huv Ntiaj Teb kuj pom zoo kom siv cov khoom tua kab uas muaj DEET los tiv thaiv cov kab uas kis tau los ntawm tus kab mob. Nws feem ntau sib xyaw nrog lwm cov tshuaj tua kab, tab sis nws cov tshuaj lom tau nce ntxiv thaum sib xyaw nrog cov tshuaj tua kab carbamate.

Cov Khoom DEET

CAS No. 134-62-3

Cov mis mos molecular C12H17NO

Qhov hnyav molecular 191.27

EINECS No. 205-149-7

Qhov kub yaj -45°C

Kub taw tes 111°C1mmHg

Qhov Ceev 0.998g/mL ntawm 20°C (lit.)

Qhov ceev ntawm cov pa 6.7 (Chemicalbookvsair)

Siab ntawm cov pa dej <0.01mmHg (25°C)

Refractive index n20/D1.523 (lit.)

Qhov kub hnyiab > 230°F

Cov Ntaub Ntawv Tiv Tauj

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