THE EVALUATION OF STABILITY OF DILUTED O W EMULSIONS BY SPECTROSCOPICMETHOD/

A spectroscopic method for evaluation of stability of the diluted O/W emulsions has been proposed as a tool for testing emulsifiable pestici de formulations at field conditions. Using xylene as an oil phase, the re has been tested stability of the emulsions, containing 0,2 or 2% of the oil phase for 14 commercial emulsifiers. It has been found that e mulsifiers forming stable concentrated emulsions are also effective as stabilizers of the diluted emulsions. That condition is requisite but not sufficient, because the reverse relation is not always true. No s imple relation has been found between such parameters as water index, phenol index or emulsion inversion point and ability of the emulsifier to stabilize diluted emulsions.