Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-18T05:27:02.620Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of Structural Variations in Ionic Surfactants on Phytotoxicity and Physical-chemical Properties of Aqueous Sprays of Several Herbicides

Published online by Cambridge University Press:  12 June 2017

L. L. Jansen
L. L. Jansen*
Affiliation:
Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland
Get access

Abstract

Anionic and cationic surfactants differentially enhanced the phytotoxicities of four herbicides to corn and soybeans in relation to variations in their structure. Thirteen ionic and two related nonionic surfactants were studied in sprays containing water-soluble forms of 2,2-dichloropropionic acid [dalapon], 2,4-dichlorophenoxyacetic acid [2,4-D], 4,6-dinitro-o-sec-butylphenol [DNBP], and 3-amino-1,2,4-triazole [amitrole]. Effects of surfactant structure, type, and concentration on two other spray properties—surface tension and specific conductivity—were measured at three pH conditions.

Appreciable enhancement of herbicide toxicities occurred only at the highest concentration, 1.0 g per 100 ml (1.0 percent). With straight-chain isomers of an alkylbenzenesulfonate (ABS) anionic surfactant, enhancement of all herbicides increased as the position of the benzene ring was moved to the mid-chain (C5 and C6) carbons of an n-dodecyl alkyl group. DNBP toxicity to both species and surfactant toxicities to soybeans were increased progressively in separate odd- and even-carbon series, i.e. a C1,3,5-series and a C2,4,6-series. Other ABS variations which provided marked enhancement were use of a highly-branched dodecyl alkyl and substitution of an ester oxygen atom for the benzene ring. Among ethoxylated alkylamine cationic surfactants, variations in alkyl structure affected differentially the toxicities of the various herbicides at alkaline, neutral, and acid pH. Surfactants caused marked modification of physical-chemical properties of sprays in relation to their structure and concentration. However, no one of the properties studied could be correlated consistently with the herbicidal effectiveness of a spray. Results suggested that spray performance of herbicide formulations can be improved by using more effective surfactants to achieve other desired formulation characteristics. The increased toxicity of 2,4-D in certain alkaline sprays also suggested that the conditions necessary for absorption of 2,4-D should be examined more critically.

Type
Research Article
Information
Weeds , Volume 13 , Issue 2 , April 1965 , pp. 117 - 123
Copyright
Copyright © 1965 Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Anonymous. 1963. Union Carbide will make detergent alkylate. Chem. & Eng. News 41(24):25–26.Google Scholar
2. Dow Chemical Company. 1961. Guideposts to better results with Dowpon—1961. (Offset) ACD File No. HG-65. Midland, Mich., January 2. 2 p.Google Scholar
3. E. I. du Pont de Nemours & Company, Inc. 1962. Supplemental labeling—“Karmex” diuron weed killer in combination with Du Pont Surfactant WK as lay-by treatment for post-emergence weed control in cotton. (Offset) Agr. Bull. (Du Pont) A-24864, May 31. 1 p.Google Scholar
4. Hull, H. M. 1956. Studies on herbicidal absorption and translocation in velvet mesquite seedlings. Weeds 4:22–42.Google Scholar
5. Jansen, L. L. 1964. Relation of structure of ethylene oxide ether-type nonionic surfactants to herbicidal activity of water-soluble herbicides. J. Agr. Food Chem. 12:223–227.Google Scholar
6. Jansen, L. L., Gentner, W. A., and Shaw, W. C. 1961. Effects of surfactants on the herbicidal activity of several herbicides in aqueous spray systems. Weeds 9:381–405.Google Scholar
7. McWhorter, C. G. 1963. Effects of surfactant concentration on Johnsongrass control with dalapon. Weeds 11:83–86.Google Scholar
8. McWhorter, C. G. 1963. Effects of surfactants on the herbicidal activity of foliar sprays of diuron. Weeds 11:265–269.Google Scholar
9. National Cotton Council. 1963. Official 1963 cotton pest control guides. Memphis, Tenn. 33 p.Google Scholar
10. Orgell, W. H. and Weintraub, R. L. 1957. Influence of some ions on foliar absorption of 2,4-D. Bot. Gaz. 119:88–93.Google Scholar
11. Schwartz, A. M., Perry, J. W., and Berch, J. 1958. Surface active agents and detergents. Vol. II. Interscience Publishers, New York. 839 p.Google Scholar
12. United States Tariff Commission. 1962. Synthetic organic chemicals, United States production and sales, 1961, p. 45–49. In TC Publ. No. 72, U. S. Government Printing Office, Washington.Google Scholar