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Biomedical subjects

R B Baird

Publications and source records attributed to R B Baird.

9 recordsLinked to original sources
PubMed1978

Chlorination of benzidine and other aromatic amines an aqueous environments.

The fate of aniline, N,N-dimethylaniline and benzidine in chlorinated waters was investigated. Conditions were controlled to approximate the process chlorination of raw water supplies and wastewater secondary effluents. As the molar ratio, (Cl2)/(amine), was increased, amine depletions increased and leveled off at about (Cl2)/(amine) = 1. Depletions in distilled water with "free" chlorine were somewhat higher than those in activated sludge/secondary effluent with combined chlorine. For each amine the number and type of products appeared to be independent of the water matrix and the ratio, (Cl2)/(amine). For the monophenyl amines ring chlorination was a significant depletion pathway. Extended chlorination of aniline yielded a precipitated product, while the N-substituted amine, N,N-dimethylaniline did not yield a solid product. In contrast to the monophenyl amines, when benzidine (p,p'-diaminobiphenyl) was exposed to chlorinated waters, a solid product resulted immediately. Infra-red analysis of this product indicated a polymeric structure with no ring chlorination. GLC analysis of the chlorination supernatant showed no ring substituted isomers of benzidine.

Aniline Compounds↗
PubMed1974

A new E. coli O group O158 associated with an outbreak of infantile enteritis.

An outbreak of acute diarrhoea occurred amongst babies in a special care baby unit. Thirteen babies were at risk; six suffered diarrhoea and three of these died. An Escherichia coli with an unidentifiable O antigen and flagellar antigen H23 was isolated from all six cases. This O antigen has been accepted into the international scheme as O158.

Cross Infection↗