The toxicity of oil herbicides to Paspalum dilatatum Poir.: Effect of composition of the oil

1952 ◽  
Vol 3 (4) ◽  
pp. 372 ◽  
Author(s):  
LF Myers
Keyword(s):  
Boiling Point ◽  
Paspalum Dilatatum ◽  
Aromatic Fraction ◽  
Boiling Range ◽  
Contact Effect ◽  
Oil Toxicity

Hydrocarbon oils of varying boiling range and percentage "aromatic" fraction were tested for their toxicity to Paspalum dilatatum in the field and glass-house.Contact injury and final toxicity are separate phenomena and are controlled by different factors. The contact effect of oil herbicides depended on the proportion of aromatic fraction in the oil. The minimum percentage of aromatics required to produce rapid contact injury increases with increasing boiling-point of the oil. Mid boiling-point was shown to be an important and consistent factor in oil toxicity as measured by regrowth. Oil toxicity increases with mid boiling point of the oil. Toxicity in the field decreases with increasing aromatics. In the glasshouse the reverse is the case.

The toxicity of oil herbicides to Paspalum dilatatum POIR. 2. The effect of light on toxicity.

1953 ◽  
Vol 4 (2) ◽  
pp. 177 ◽  
Author(s):  
LF Myers
Keyword(s):  
Perennial Grass ◽  
Supporting Evidence ◽  
Additional Experiment ◽  
Paspalum Dilatatum ◽  
Contact Effect ◽  
Before And After ◽  
Per Se ◽  
Reduced Toxicity ◽  
Light Shading ◽  
Effect Of Light

The influence of light on the phytotoxicity of hydrocarbon oils was investigated by exposing the oils to light before and after application to a perennial grass, Paspalurn dilatatum Poir. Exposure of the oils to light and air for a month prior to spraying slightly increased the speed of contact injury to foliage but did not affect regrowth. Oils had a contact effect on foliage only in the presence of light. Shading the plants for one week following treatment delayed the development of contact injury and resulted in greater inhibition of regrowth (toxicity). The increase in toxicity following shading is ascribed to the delay in contact effect per se. The results suggested an antagonism between speed of contact injury and inhibition of regrowth. Supporting evidence was provided by an additional experiment in which fortifying agents were added to the oils. Fortifying agents increased speed of foliage kill but in no instance was toxicity increased. When power kerosene was used the addition of fortifying agents reduced toxicity.

Apparatus for Boiling Point and Boiling Range Measurements

1934 ◽  
Vol 6 (6) ◽  
pp. 466-468 ◽  
Author(s):  
D. Quiggle ◽  
C. O. Tongberg ◽  
M. R. Fenske
Keyword(s):  
Boiling Point ◽  
Range Measurements ◽  
Boiling Range

Inhibition of Radical-Initiated Vinyl Acetate Polymerisation by Tobacco Smoke Fractions

1974 ◽  
Vol 7 (5) ◽  
Author(s):  
M.A. Nisbet ◽  
S. Schmeller
Keyword(s):  
Benzoyl Peroxide ◽  
Vinyl Acetate ◽  
Tobacco Smoke ◽  
Boiling Point ◽  
Water Bath ◽  
Measuring Time ◽  
Time Required

AbstractBoth the vapour and particulate phases of tobacco smoke have been shown to retard benzoyI-peroxide-initiated polymerisation of vinyl acetate by interception of the radicals involved in the polymerisation process. The extent of inhibition of polymerisation by test compounds is estimated by measuring time taken for a mixture of monomer and benzoyl peroxide, immersed in a water-bath at 70°C, to reach a spontaneous boil and comparing it with the time required for a similar mixture with added retarder to reach boiling point. Units are expressed as minutes of inhibition per part per million of inhibitor × 10

HASTELLOY ALLOY D

Alloy Digest ◽  
1956 ◽  
Vol 5 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Physical Properties ◽  
Tensile Properties ◽  
Boiling Point ◽  
Cast Alloy ◽  
Heat Treating

Abstract HASTELLOY ALLOY-D is a cast alloy composed primarily of nickel and silicon, and is exceptionally resistant to sulfuric acid of all concentrations even up to the boiling point. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-29. Producer or source: Haynes Stellite Company.

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