Study of the influence of the parameters of the preparation process on the structure of a highly porous copolymer of styrene and divinylbenzene

The effect of polymerization parameters and drying temperature on the structure of a porous styrene-divinylbenzene copolymer obtained on the basis of highly concentrated emulsions was investigated. The structure of this material consisted of two types of pores: voids with an average size of 3.5±0.3 μm and holes in the pore walls with an average size of 0.7±0.2 μm. It was determined that both in materially initiated and radiation polymerization, porous copolymers of styrene and divinylbenzene with the same structure are formed.

STUDY OF SORBTION OF COPPOLYMER COPY (II) IONS MADE ON THE BASIS OF ACRYLONITRYL AND HEXAGIDRO 1,3,5 -TRIYACRYLTRIAZINE

The scientific and theoretical basis of sorption of copper (II) ions by the newly obtained complex was studied in order to search for possible areas of practical application. The complexite with hydrazidine groups, ie the porous copolymer of acrylonitrile, is obtained by amine hydroxylamine with hexahydro 1,3,5-triacryliltriazine.

The method of multicomponent determination of herbicides of various chemical classes in water

In the work there are considered results of the development of the multicomponent method of measurement of concentration of herbicides of various chemical nature under their joint presence in the water. There was justified the optimality of application of HPLC-DAD (the working wavelength of 240 nm) for the determination of levels of 10 active ingredients of herbicides of class of sulfonylurea (metsulfuron-methyl, nikosulfuron, sulfometuron-methyl, thifensulfuron-methyl, triflusulfuron-methyl), imidazolinone (imazapyr, imazethapyr), 2,6-Bis[(4,6-dimethoxy-2- pyrimidinyl)oxy]benzoic acid (bispyribac acid), triazol-pyrimidines (Penoxsulam), a benzoylpyrazole compound (Topramenzone). For the concentrating and cleaning of samples of water there were used cartridges for solid-phase extraction of Oasis HLB - the macro porous copolymer made on the basis of the balanced ratio of 2 monomers - lipophilic divinylbenzene and hydrophilic N-vinylpirrolidone. The range of the detected concentrations in water was volatile between 0.0005 and 0.005 mg/L, values of standard deviation vary in the range of 1.8-3.9%. Chlorine-containing acidic herbicides were analyzed by the method of GC-ECD and GC-MS (IE) after preliminary converting of compounds into flying derivatives with the use of diazomethane. Satisfactory extraction of substances from a water sample may be achieved by classical extraction in the system “liquid-liquid” with the application of Methyl tert-butyl ester. For cleaning of the derivatized sample there were used cartridges for solid-phase extraction on the basis of silica gel. The range of the determination of 9 active ingredients referring to classes of phenoxy-acetic acid (2,4- D, MCPA), pyridinecarboxylic (aminopyiralid, picloram, clopyralid), benzoic acids (dicamba), benzothiadiazinone (bentazone), biphenyl ester (acifluorfen) and a chloroacetamide (acetochlor) - 0.0001-0.001 mg/L, SD values vary in the range of 1.8-33%.