2,4-D

Product introduction

It is a kind of representative synthetic auxin, which is a type of analogue of auxin, referred to as 2,4-D. It showes a high activity in the conventional quantitative method of auxin, but the effect was quite weak in the oat elongation test using the auxin standard quantitative method.

It will turn to purple when treated with chromium acid, which can be used for colorimetric quantification. Since P.W. Zimmermann (1942) found the function of 2,4-D, the application of many synthetic auxins employing this material as the core in agriculture achieved speedy development. This material has been used on a large scale in herbicide and agents to prevent fruit falling early as well as other products. The 2,4-D in plants can transfer fairly quickly. According to the results of 14C tracer, it is confirmed that the substance carries out catabolism rapidly in the sequence of carboxy carbon and then methylene carbon, but its benzene nucleus doesn’t separate easily. The 2,4-D sprinkled into the soil can be decomposed by Gram-negative coccus, aquatic flavobacteriumaquatile and other bacteria.

It is also a major herbicide once used as a model compound for the study of microbial degradation of chlorinated aromatic compounds.

Main applications

Herbicide, plant growth regulator, the determination of carbon and hydrogen standards in organic microanalysis

Calibration of instruments and devices; evaluation methods; working standard; quality assurance/ quality control;

Physical and chemical properties

Boiling point: 160℃

Density: 1.563 g/cm3

White diamond crystal, soluble in alcohol, ether, ketone and other major organic solvents, almost insoluble in water

Functions

At high concentrations of 500 ppm or above, it is used for stem and leaf treatment. With systemic absorption, it can be used to prevent and control quinoa, amaranth and other broad-leaved weeds and germinating gramineous weeds in the fields of wheat, rice, maize, sugar cane and other crops. It can enter plants through the roots, stems and leaves with slow degradation. So that it can accumulate a certain concentration to interfere with hormone balance in plants, to disrupt metabolic of nucleic acids and protein and to promote or inhibit the growth of certain organs. So the weed stems and leaves get twisted and the weed stem bases get thicker and swollen. Gramineous crops have strong endurance at the stage of 4-5 leaves which is an optimum period for chemical spray. Sometimes, it is also used in the pre-emergence soil treatment of maize so as to control a variety of monocotyledonous and dicotyledonous weeds. It can increase the herbicidal effect when mixed with herbicides like atrazine, prometryn etc. or with ammonium sulfate and other acidic fertilizers. At the temperature of 20 ~ 28℃, the efficacy increases as the temperature rises but the efficacy reduces when the temperature goes below 20℃. At high temperatures, the 2,4-D butyl ester volatilizes in large quantity. And it is easy to spread and drift to damage the neighboring dicotyledonous crops and trees. So it shall be used with caution. The 2, 4-D is strong in adsorption. So the used sprayer must be fully washed to protect cotton, vegetables and other sensitive corps from the harm of the residuals. However, it is safe for human and animals.