. The Bell System technical journal . ticized withpolyester E/DOP is used much more rapidly than any of the otherpolyvinyl chloride compounds. There is no e\idence of attack on poly-\inyl chloride resin, again indicating that the attack is on the plasticizers,not the polyvinyl chloride itself. In this regard, it should be pointed outagain that although the polyvinyl chloride compound listed as no plas-ticizer (rigid) in the tables and text does not contain an external plas- Table XII — Hydrogen Sulfide Production by Marine Bacteria IN Anaerobic Sea Water Test with Elastomers as the Only Source
. The Bell System technical journal . ticized withpolyester E/DOP is used much more rapidly than any of the otherpolyvinyl chloride compounds. There is no e\idence of attack on poly-\inyl chloride resin, again indicating that the attack is on the plasticizers,not the polyvinyl chloride itself. In this regard, it should be pointed outagain that although the polyvinyl chloride compound listed as no plas-ticizer (rigid) in the tables and text does not contain an external plas- Table XII — Hydrogen Sulfide Production by Marine Bacteria IN Anaerobic Sea Water Test with Elastomers as the Only Sources of Organic Carbon Elastomer GR-S jacket (54-14) GR-A jacket (54-18) Biitvl jacket (54-19) Natural rubber jacket (54-23) .. Neoprene jacket (54-164) Controls (inoculated sea water) HzS Production after Weeks of Incubation ppm 8 ppm 12 ppm 16 ppm 1110 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957 lOOr 2dCLI (TUJ << LU zou r. 6 8 10 12 INCUBATION TIME IN WEEKS 14 16 18 Fig. 4 — Examples of H2S production by marine bacteria in anaerobic seawater test with Poly (Vinyl Chloride) plastics as carbon source. ticizer, fatty acid lubricant probably serves as a source of nutrient. Forcomparative purposes, the examples of hydrogen sulfide productionplotted in Fig. 4 are for the same plastics included in Fig. 3 which relatesto the data from the aerobic procedure. Jute is attacked by the anaerobic bacteria just as it is utilized by theaerobic organisms. However, neither the epoxide casting resin (TableX) or the polyester casting resin (Table XI) seem to serve as a sourceof carbon. The results of the anaerobic test with the elastomers are presented inTable XII. It is interesting to note that early attack occurs on thenatural and butyl rubber jackets, but that none of the other elastomersis utilized by the organism. It is somewhat surprising that attack onGR-S did not progress at
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