Biomedical subjects
Publications and source records attributed to R C Lao.
Surveys for airborne mercury in two Ottawa hospitals have been conducted. Two different analytical methods were used. Although the concentrations of mercury vapor were below the TLV, all samples analyzed showed measureable amounts of mercury to be present. Predominant sources of mercury contamination are broken thermometers and sphygmomanometers.
An analytical scheme was developed for vinyl chloride, which is applicable to ambient and in-plant atmospheres. Using computerized gas chromatographs equipped with automatic injection system and flow rate control, high reproducibilities are achieved in the ppb range. Samples from various sources have been analyzed.
Following the suggestion proposed by Duke, Shaheen, and Nowicki, this study was designed to test the basic hypothesis that the meaning of internal-external control (I-E) may differ with age. Such variables as age, educational level, socioeconomic status, self-confidence, etc., which have consistently been found to relate to I-E for children through college age Ss, were examined to see if these bear a relationship to I-E for a group of parents (95 fathers and 107 mothers) of college students (father mean age 48, mother mean age 46). Results indicated that with the exception of father education, there was no significant relationship between I-E and all other variables. Thus, these findings support the notion that I-E is an age-related variable, that generalizations from previous studies to older people should be re-evaluated, and that future research should study the meaning and dynamics of I-E for older people.
Substantial progress has been made in the last few years in the development of a rapid method for determining polycyclic aromatic hydrocarbons (PAH) in environmental samples. The three-step method consists of (i) a preliminary separation of PAH by solvent and/or column chromatography, (ii) identification by a combination of gas chromatography with quadrupole mass spectrometry and computer, and (iii) measurement by computerized gas chromatography using internal standards. Samples of industrial effluents, coke oven emissions, coal tar and airborne particulates have been investigated. The efficiencies of different gas chromatographic columns were evaluated during these investigations.
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