Studies on the effect of Bladex and Etazine on bacterial indices of pollution
The effect of the triazine herbicides Etazine and Bladex on coliform and fecal streptococci groups was studied in Nile river water, Nile water seeded with sewage, and autoclaved Nile water. The results indicate the fecal streptococci were able to persist and multiply in Nile water containing Bladex or Etazine and seeded with sewage. The successive addition of Bladex and Etazine (up to 10 mg/liter) increased its degradation rate and had no inhibitory effect on the bacterial parameters.
Ecological Distribution of Pesticides in Lake Poinsett, South Dakota
Abstract Ecological distributions of chlorinated hydrocarbon residues in Lake Poinsett, South Dakota were studied from June, 1967 to June, 1968. Components of the ecosystem analyzed were water, bottom sediments, zooplankton, benthic algae, crayfish, aquatic insects and fish. Concentrations of aldrin, p,p'-DDD, p,p'-DDE, p,p'-DDT, dieldrin, endrin, heptachlor, heptachlor epoxide, lindane, methoxychlor and toxaphene were determined by gas chromatography and thin-layer chromatography. DDT and its metabolites, DDD and DDE, were the highest residues detected in all trophic levels examined. Heptachlor, heptachlor epoxide, aldrin, dieldrin and lindane were present in the majority of sample types, while neither endrin nor methoxychlor was detected above analytical confidence limits in any sample. Toxaphene was present in four fish. DDT and metabolites increased in percentage of total residue, while the ratio of DDT to DDD plus DDE decreased with increase in trophic level. The ratio of the epoxide form of heptachl...
Liquid state 1H high field NMR in food analysis.
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