Wyniki wyszukiwania - BazTech

1

Hydrochinon

Politowicz M.

Podstawy i Metody Oceny Środowiska Pracy

|

1998

|

Nr 19

91--95

2

Fosforan(V) tristolilu (mieszanina izomerów)

Politowicz M.

Podstawy i Metody Oceny Środowiska Pracy

|

1998

|

Nr 19

82--86

3

Chromatographic determination of harmful compounds emitted during hardening of phenol-fomaldehyde resins

Pośniak M., Politowicz M.

Chemia Analityczna

|

1998

|

Vol. 43, No. 2

241-255

EN

The optimum conditions for determination of methanol, phenol, o-cresol, m-, P-cresols and formaldehyde, from one sample air, in the mixtures emitted during the hardening of phenol-formaldehyde resins were elaborated. In order to isolate the tested compounds from air a four layer adsorbing tube was used - 300 mg and 50 mg of silica gel and 100 mg and 50 mg of silica gel covered with 2,4-dinitrophenylhydrazine. The desorption coefficients of methanol, phenol, o-cresol, m- and p-cresols from silica gel by 5% ethanol solution in acetonitrile were: 81.4%, 97.0%, 98.3% and 97.9%, respectively. The the recovery coefficient of formaldehyde was 97.0%. The analytical procedure enables to determine methanol within 10-200 mg m 3, phenol 1-20 mg m.(-3), o-cresol 0.2-4 mg m.(-3), m- and p-cresols - 0.2-4 mg (-3) and formaldehyde - 0.04-1.2 mg m (-3) in the workplace air in the presence of other substances which may occur during the process of hardening phenol-formaldehyde resins.

PL

Opracowano optymalne warunki oznaczania, z jednej próbki powietrza, alkoholu metylowego, fenolu, o-krezolu, m-, p-krezoli oraz formaldehydu w mieszaninach emitowanych podczas utwardzania żywic fenolowo-formaldehydowych. Do wyodrębniania badanych związków z powietrza zastosowano rurkę pochłaniającą z czterema warstwami - 300 i 50 mg żelu krzemionkowego oraz 100 i 50 mg żelu krzemionkowego pokrytego 2,4-dinitrofenylohydrazyną. Wydajność desorpcji alkoholu metylowego, fenolu, o-krezolu, m-, krezoli z żelu krzemionkowego 5% roztworem alkoholu etylowego w acetonitrylu wynosiła odpowiednio: 81.4%, 97.0%, 98.3% i 97.9%. Wydajność odzysku formaldehydu wynosiła 97.0%. Opracowana procedura analityczna umożliwia oznaczanie alkoholu metylowego w zakresie 10-200 mg m.(-3), fenolu -1-20 mg m.(-3), o-krezolu - 0,2-4 mg m , m- i p-krezoli - 0,2-4 mg m.(-3) oraz formaldehydu - 0,04-1,2 mg (-3) w atmosferze stanowisk pracy w obecności innych substancji, które mogą występować w procesie utwardzania żywic fenolowo-formaldehydowych.

4

High-performance liquid chromatographic determination of 4,6-dinitro-2-isopropylphenol in workplace air

Politowicz M., Pośniak M.

Acta Chromatographica

|

1998

|

No. 8

113-121

EN

The optimum conditions have been determined for high-perfor-mance liquid chromatographic (HPLC) analysis of 4,6-dinitro-2-isopro-pylphenol (DNPP) vapour and aerosol in workplace air; the conditions investigated were not only those used for chromatography, but also those enabling representative sampling of air, full separation of the tested compound, and the determination of desorption coefficient. For DNPP concentrations from 0.0125 to 0.15 mg m-3 the calibration plot can be represented by a straight line. The coefficient of desorption was found to be 93%.

5

Gas chromatographic determination of diethylene glycol in workplace air

Politowicz M., Pośniak M.

Acta Chromatographica

|

1998

|

No. 8

154-161

EN

A capillary gas chromatographic method with flame-ionization detection has been developed for determination of diethylene glycol (DEG) aerosols at concentrations between 2.5 to 30.0 mg m-3 in work-place air. Polypropylene filters were used to sample DEG aerosols from air; the recovery was 90%. The working temperature and carrier gas flow rate used for gas chromatography were optimized to enable separation of DEG from solvent and other compounds present in industrial air. The detection limit was 50 ng on-column.