Premium
Evaluation of the types of emission systems observed in aqueous media with controlled‐release formulations
Author(s) -
Sherman Larry R.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270319
Subject(s) - aqueous solution , biocide , solubility , degradation (telecommunications) , chemistry , aqueous medium , function (biology) , controlled release , solvent , chemical engineering , materials science , thermodynamics , physics , nanotechnology , organic chemistry , computer science , telecommunications , evolutionary biology , engineering , biology
Three types of release systems have been observed for controlled release formulations (CRF) of biocides in aqueous media. A type I system, which is concentration dependent, can be divided into a IA system whose concentration maximum is dependent upon sample size and degradation, and a IB system whose concentration is dependent upon the solubility of the biocide in the solvent. A type II system, which is time dependent, can be divided into a IIA system whose release rate is dependent upon t 1/2 and a IIB system whose emission is zero order or dependent only upon time. A type III system, which is a failure system, can be divided into a IIIA system whose concentration decreases to a nondetectable range as a function of t 1/2 and a IIIB system whose decreasing concentration is first order. Equations relating the theoretical life of the CRF to its bioactive life are also presented.