Analysis of drinking water in airports, airplanes and public water facilities.
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The results indicated that drinking water samples from 4 (44.4%) of 9 airports and from 2 (22.2%) of 9 airplanes gave a positive qualitative test for at least any one of ammoniacal nitrogen, nitrite nitrogen and nitrate nitrogen. Samples from 8 (57.1%) of 14 airports, from 8 (66.7%) of 12 airplanes and from 10 (62.5%) of 16 public facilities showed a value for the consumption of potassium permanganate of 20 mg/<I>l</I> or above. Those from 5 (31.3%) of 16 airports, from 3 (18.8%) of 16 airplanes and from 3 (15.0%) of 20 public facilities had a hardness of 200 mg/l or above. A total bacterial count of 1.0×102/ml or above was obtained for samples from 6 (66.7%) of 9 airports, from 7 (63.6%) of 11 airplanes and from 11 (61.1%) of 18 public facilities; a positive coliform group culture was noted for samples from 5 (62.5%) of 8 airports, from 6 (60.0%) of 10 airplanes and from 4 (36.4%) of 11 public facilities. Residual chloride was not detected in any measurable amount in samples from 9 (56.3%) of 16 airports, from 2 (40.0%) of 5 airplanes and from 4 (57.1%) of 7 public facilities.<BR>Bacteriological examination of 29 samples positive for total bacteria and coliform bacilli revealed that <I>Escherichia coli</I> was detected most frequently, followed by <I>Acinetobacter calcoaceticus, Aeromonas hydrophilia, Pseudomonas</I> spp., <I>Klebsiella pneumoniae, Proteus mirabilis, Enterobacter cloacae</I> and <I>Citrobacter freundii</I> in that descending order.<BR>Striking correlation were noted to exist between negativity for residual chloride and positivities for total bacteria or coliform group; and then positivities for ammoniacal nitrogen, nitrite nitrogen, nitrate nitrogen, a heightend value of the consumption of potassium permanganate and positivities for total bacteria or coliform group.
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