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N,N- Dimetyloformamid. Dokumentacja proponowanych wartości dopuszczalnych poziomów narażenia zawodowego

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EN
N,N-Dimetyloformamide
Języki publikacji
PL
Abstrakty
PL
Światowa produkcja DMF w 1995 r. wynosiła około 500 tys. ton. W Stanach Zjednoczonych, gdzie produkcja DMF w 1987 r. przekroczyła 250 tys. ton, liczba osób narażonych na ten związek wynosiła około 120.000 osób. W Polsce dokładna liczba osób narażonych na DMF nie jest znana. W 1995 r. w jednym z zakładów produkujących sztuczną skórę liczba narażonych zawodowo na ten związek wynosiła około 300 osób, w tym 50 osób narażonych na związek o stężeniach przekraczających dotychczas obowiązującą wartość NDS, tj. 10 mg/m3. Zgodnie z dyrektywą nr 92/32/EEC należy zaliczyć DMF do grupy związków szkodliwych. Na podstawie wyników badań na zwierzętach doświadczalnych nie stwierdzono, aby związek ten wykazał działanie drażniące czy uczulające; nie wykazano również jego działania rakotwórczego i teratogennego. W licznych testach in vitro i in vivo wykazano brak działania genotoksycznego związku. DMF w dużych dawkach wykazuje działanie hepatotoksyczne, które stwierdzono u wielu gatunków zwierząt po podaniu związku różnymi drogami i w różnym czasie. Obserwowano nasilanie się skutków działania hepatotok- sycznego DMF w zależności od stosowanych dawek. DMF ulega wchłanianiu w postaci par w drogach oddechowych i przez skórę. W badaniach eksperymentalnych na ochotnikach retencja DMF w płucach wynosiła około 90%. Ciekły DMF naniesiony na skórę wchłania się bardzo szybko, a wyznaczony u ludzi współczynnik wchłaniania wynosi 9 mg/cm2/h. Za efekt krytyczny działania tego związku przyjęto działanie układowe na wątrobę. W celu obliczenia i ustalenia wartości NDS przyjęto wartość NOEL dla szczurów w warunkach 2-letniego narażenia inhalacyjnego, która wynosiła 75 mg/m3. Po uwzględnieniu powyższych danych zaproponowano utrzymanie dotychczasowej wartości 10 mg/mJ jako wartości NDS DMF. Wyliczona wartość NDS związku powinna zapobiec skutkom zdrowotnym długotrwałego narażenia na DMF w warunkach narażenia zawodowego. Proponujemy ponadto przyjąć wartość DSB, podobnie jak w Niemczech i USA, gdzie wymagane jest oznaczanie w moczu jednego z głównych metabolitów DMF /V-metyloformamidu (NMF). Obowiązująca w Niemczech wartość NDS DMF wynosi 30 mg/m3, a wartość DSB - 15 mg /V-metyloforma- midu/1 moczu. Ze względu na prostoliniową zależność stężenia A^metyloformamidu w moczu od stężenia DMF w powietrzu, po odpowiednim przeliczeniu dla wartości proponowanego przez nas NDS (10 mg/mJ) DSB w Polsce powinno wynosić 5 mg NMF/1 moczu. Ze względu na duże wchłanianie DMF przez skórę w postaci ciekłej i w postaci par, proponujemy dodatkowe oznaczenie literami Sk. Nie ma podstaw do ustalenia wartości NDSCh N,N -dimetyloformamidu.
EN
Dimethylformamide (DMF) is a colourless and hygroscopic liquid with a faint odour of amines. It is mainly used as a liquid and gas solvent in organic synthesis in the process of producing low - and high-molecular vinyl and acryl polymers, foil, fibres and coatings. IN 1995, the world production of DMF was about 500,000 tons. In the USA, where in 1987 DMF production exceeded 250,000 tons, about 120,000 people were exposed to this compound. In Poland the exact number of people exposed to DMF is unknown. In 1995, in one of the plants producing artificial leather, about 300 workers were occupationally exposed to this compound. 50 of them were exposed to concentrations exceeding the so far obligatory TLV value (10 mg/m3). According to European Union instruction No. 92/32/EEC DMF should be included in the group of harmful compounds. On the basis of the results of investigations on laboratory animals the compound does not demonstrate irritating, sensitizing, carcinogenic or teratogenic effect. In numerous in vitro and in vivo tests the compound showed no genotoxic effect. In high doses DMF reveals hepatotoxic effect observed in many animal species after administration of the compound in various ways and at different times. Intensification of DMF hepatotoxic effect was found depending on the applied doses. DMF is absorbed in the form of vapours in the airways and through skin. In experimental studies on volunteers, DMF retention in lungs w'as about 90%. Liquid DMF applied on skin is absorbed very quickly and the determined in humans absorption coefficient is 9 mg/cm2/h. Systemic activity on liver has been assumed to be critical effect of the compound. To calculate and establish a TLV value the NOEL value of 75 mg/m for rats in the condition of 2-year inhallatory exposure was ac¬cepted. Taking into consideration the above data, the so far used value 10 mg/nr’ has been suggested to be retained as a TLV value for DMF. The calculated TLV value of the compound should prevent health effects of long-term exposure to DMF in occupational exposure. Moreover, we suggest accepting a BEI value, like in Germany and the USA, where determination of iV-methylformamide (one of main DMF metabolites) in urine is required. In Germany, the obligatory TLV value for DMF is 30 mg/mJ and the BEI value is 15 mg /V-met- hylformamide/1 of urine. Due to rectilinear dependence of //-methylformamide urine concen¬tration on DMF concentration in the air after adequate calculation for the suggested by us TLV value (10 mg/nr’), the BEI value in Poland should be 5 mg NMF/1 of urine. Considering high DMF skin absorption in the liquid and vapour form we suggest an additional determina¬tion with letters Sk. There are no bases for establishing a STEL value.
Rocznik
Tom
Strony
61--82
Opis fizyczny
Bibliogr. 73 poz., rys., tab.
Twórcy
autor
  • Uniwersytet Medyczny w Łodzi Zakład Toksykologii 90-151 Łódź ni dr. J. Muszyńskiego 1
autor
  • Instytut Medycyny Pracy prof. dr. med. Jerzego Nofera 90-950 Łódź św. Teresy 8
Bibliografia
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