10 



BULLETIN 1313, TJ. S. DEPARTMENT OF AGRICULTURE 



Table 2. — Formulas, molecular weights, boiling points, and lethal concentrations 

 (from results in Table 1) of fumigants 



Fumigant 



Formula 



Mo- 

 lecular 

 weight l 



Boiling 

 point 2 



Lethal concentration 3 

 (molar percentage) 



S. 

 oryza 



S. 

 gran- 

 arius 



Tri- 

 bol- 

 ium 



Hydrocarbons: 



Amylene 



Kerosene.. 



Cyclohexane .. 



Benzene 



Toluene 



o-Xylene 



Naphthalene 



Anthracene 



Bromides: 



Bromoform 



Ethyl bromide 



Ethylene bromide 



7i-Propyl bromide 



Allyl bromide 



7i-Butyl bromide 



Bromobenzene 



Benzyl bromide 



Chlorides: 



Methylene chloride 



Chloroform 



Carbon tetrachloride .. 

 Acetylene dichloride... 



Ethylene chloride 



Ethylidene chloride — 



Trichloroethane 



Trichloroethylene 



Tetrachloroethane 



Tetrachloroethylene 

 Propylene dichloride .. 



Isopropyl chloride 



Monochlorobenzene 



o-Dichlorobenzene 



p-Dichlorobenzene 



o and p-Dichlorobenzene 



Fluorides: 



Fluorobenzene 



Difluorodiphenyl 



Iodides: 



7i-Butyl iodide. 



Alcohols and phenols 



Methyl alcohol 



Ethyl alcohol 



71- Propyl alcohol 



«~Butyl alcohol 



Isoamyl alcohol 



Geraniol 



Thymol... 



Menthol 



Aldehydes: 



Chloral hydrate 



m-Butyraldehyde 



Crotonaldehyde 



Furfural-.. 



Benzaldehyde 



Ketones: 



Acetone 



Chloroacetone 



Ethyl methyl ketone... 



Mesityl oxide 



Acetophenone 



Chloroacetophenone 



Esters: 



Methyl formate 



Ethyl formate. 



Isopropyl formate 



Methyl cyano formate.. 



n-Propyl acetate 



m-Butyl acetate 



Isobutyl acetate 



Isoamyl acetate 



Ethyl-n- valerate 



C 6 Hio 



Mixture 



C 8 H 12 



CeHs 



CeHsCHa--. 

 C 6 H4(CH 3 )3- 



CioHs.. 



ChHio 



CHBrs. 



C 2 H 5 Br 



C 2 H 4 Br2 



C 3 H?Br 



CsHsBr 



C4H 9 Br 



CeHoBr 



CeHsCHzBr. 



CH2CI2- 



CHCls— 



CCI4 



C2H2CI3 



C2H4CI2 



C2H4CI2 



C2H3CI3 



C2HCI3 



C2H2CI4 



C2CI4 



C3H6CI2 



(CH 3 )sCHCl. 



CeHsCl 



C6H4CI2 



CeBUCla 



C6H4CI2 



C 6 H 5 F 



C8H4F-C6H4F. 



C4H9L 



CH3OH- 



C2H5OH 



C3H7OH 



C4H9OH. - 



CsHiiOH... 



C9H15CH2OH 



(CH3)2CHC 6 H3(CH3)OH 

 C10H19OH 



CC1 3 CH(0H)2_. .. 



C3H7CHO.-. 



CH3CH-CHCHO. 



C4H3OCHO 



C«H 5 CHO 



CH3COCH3- 



CH 2 C1C0CH8 



C2H5COCH3 



(CH 3 )2C-CHCOCH3. 



C6H5COCH3 



CdHeCOGHaCl 



HCOOCH3 



HCOOC2H5 



HCOOCH(CHj) 2 . 



CNCOOCH3 



CH3COOC3H7 



CH3COOC4H9— . 

 CH3COOC4H9-... 

 CH3COOC5H11... 

 C4H9COOC2H5--- 



70. 105 



84.126 

 78. 078 

 92. 099 

 106. 120 

 128. 114 

 178. 150 



252. 773 

 108. 970 

 187. 882 

 122.991 

 120. 975 

 137. 012 

 156. 990 

 171.011 



84. 941 

 119. 393 

 153. 845 

 96. 946 

 98. 962 

 98. 962 

 133. 414 

 131. 398 

 167. 866 

 165. 850 

 112. 983 

 78. 531 

 112. 530 

 146. 982 

 146. 982 

 146. 982 



96. 070 

 190.124 



184. 012 



32. 037 

 46. 058 

 60.079 

 74.100 

 88.121 

 154. 194 

 150. 162 

 156. 210 



165. 414 

 72. 084 

 70.068 

 96.057 



106.083 



68.063 

 92. 515 

 72. 084 

 98. 110 



120. 104 

 154. 556 



60.042 

 74.063 

 88.084 

 85. 047 



102. 105 

 116. 126 

 116. 126 

 130. 147 

 130. 147 



°C. 



22-37. 



150-280 



80.8 



79-81 



109-110 



143.5-144.5 



218 



351 



40.3 



40.3 



413.0 

 3.8 



413.0 

 3.8 



U3.0 

 3.8 



3.0 



142-151. 

 38-40... 

 127-132. 

 70-71... 

 69-71... 

 100-101. 

 154-155. 

 198-199. 



2.9 

 .5 

 4.1 

 3.9 

 2.6 



*8.0 



.5 



4.1 



2.6 



2.9 



.5 



4.1 



4 3.9 



1.6 



40.5-42... 

 58-61.5... 



76-77 



55 



83-84 



59.5-61.5- 



74.5 



85.5-87... 

 144-146— 

 119-121... 



95-96 



34-36 



128-132... 

 178-181 .. 

 172-174... 



4.4 

 7.0 

 6.9 

 9.0 

 6.0 



10.2 

 .8 



10.0 

 1.1 

 2.6 

 4.7 



7.0 

 6.9 

 9.0 

 6.0 



10.2 

 3.8 



10.0 

 1.1 

 2.6 



4.4 

 3.2 

 6.9 

 9.0 

 4.7 



10.2 

 1.1 



10.0 

 1.1 

 1.3 

 1.2 



2.0 



2.0 



1.0 



U.9 



2.0 



2.2 



129-131 .... 



16.0 



114-118. 

 130-132.... 



230 



228-232. 

 210 



1.7 

 4 1.7 



16.0 

 1." 5 



16.0 



1.7 

 «1. 7 



97.5.... 

 75-77.5. 

 104-105. 



161 



179 



55-56... 

 117-119. 

 79-80... 

 130-131. 



202 



247 



31.5-32.5.. 

 53.5-55... 



63-64 



100-101— 



99-102 



124-126... 

 115-117... 

 138-140... 

 144-145.5. 



5.5 

 4.5 

 4.8 



4.3 



8.2 

 .2( 

 4 1.8 

 .55 

 4.16 

 .10 



4.9 

 .6 



4.5 

 .7 



2.5 



5.5 



3.3 



.6 



4.3 



7.2 

 .6 



8.2 



4 1.8 

 1.4 



4 2.65 



4.6 



.7 



2.5 



1 Based on international atomic weight values for 1922. 



5 The boiling points given are those of the substances as tested, not those of these compounds of the 

 highest degree of purity. 



3 Thelethal concentration here reported represents the minimum percentage concentration which con- 

 sistently caused 100 per cent mortality after exposure for 24 hours. Since in some eases the concentra- 

 tions tested varied decidedly and because of some variation in the experimental results, the results here 

 given do not necessarily represent the exact minimum lethal concentration. 



* Minimum concentration tested. 



