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Beryllium Concentrations at European Workplaces: Comparison of 'Total' and Inhalable Particulate Measurements.

Kock H, Civic T, Koch W - Ann Occup Hyg (2015)

Bottom Line: The geometric mean value of the ratios of time-weighted average concentrations determined from GSP and CFC samples of all personal samples was 2.88.The individual values covered a range between 1 and 17 related to differences in size distributions of the Be-containing particulates.This was supported by the area measurements showing that the conversion factor increases with increasing values of the extra-thoracic fraction covering a range between 0 and 79%.

View Article: PubMed Central - PubMed

Affiliation: 1 Fraunhofer Institute Toxicology and Experimental Medicine, Nikolai-Fuchs-Str 1, 30625 Hannover, Germany.

No MeSH data available.


Related in: MedlinePlus

Log-log-plot of all static concentration data for ‘total’ and inhalable particulates and the results of the corresponding regression analysis, u.c.i. (l.c.i.) upper (lower) limit of 95% confidence interval.
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Figure 2: Log-log-plot of all static concentration data for ‘total’ and inhalable particulates and the results of the corresponding regression analysis, u.c.i. (l.c.i.) upper (lower) limit of 95% confidence interval.

Mentions: Estimates as well as upper and lower 95% confidence intervals of the regression parameters, a and b, as well as the regression coefficient, R2, were calculated using the regression function in Excel. The analysis of all personal concentration data of the CFC (sampler #2) and the GSP (sampler #1) based on the regression of pairwise data according to equation (1) are shown Fig. 1 for the personal samples and Fig. 2 for the static samples. For the personal samples, the regression coefficients are a = 2.65 and b = 1.05. The corresponding values of the static samples are a = 1.99 and b = 1.00. As the values of the regression coefficient b are statistically indistinguishable from 1.00, the hypothesis that the magnitude of the CFC concentration influences the GSP/CFC ratio is not supported. In other words, there is a linear relationship between the concentrations measured with the CFC and those measured with the GSP sampler. This suggests that the geometric mean values of 2.88 for the personal samples and 1.99 for the static samples are appropriate conversion factors for the set of Be alloy processing operations selected in this study.


Beryllium Concentrations at European Workplaces: Comparison of 'Total' and Inhalable Particulate Measurements.

Kock H, Civic T, Koch W - Ann Occup Hyg (2015)

Log-log-plot of all static concentration data for ‘total’ and inhalable particulates and the results of the corresponding regression analysis, u.c.i. (l.c.i.) upper (lower) limit of 95% confidence interval.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4497491&req=5

Figure 2: Log-log-plot of all static concentration data for ‘total’ and inhalable particulates and the results of the corresponding regression analysis, u.c.i. (l.c.i.) upper (lower) limit of 95% confidence interval.
Mentions: Estimates as well as upper and lower 95% confidence intervals of the regression parameters, a and b, as well as the regression coefficient, R2, were calculated using the regression function in Excel. The analysis of all personal concentration data of the CFC (sampler #2) and the GSP (sampler #1) based on the regression of pairwise data according to equation (1) are shown Fig. 1 for the personal samples and Fig. 2 for the static samples. For the personal samples, the regression coefficients are a = 2.65 and b = 1.05. The corresponding values of the static samples are a = 1.99 and b = 1.00. As the values of the regression coefficient b are statistically indistinguishable from 1.00, the hypothesis that the magnitude of the CFC concentration influences the GSP/CFC ratio is not supported. In other words, there is a linear relationship between the concentrations measured with the CFC and those measured with the GSP sampler. This suggests that the geometric mean values of 2.88 for the personal samples and 1.99 for the static samples are appropriate conversion factors for the set of Be alloy processing operations selected in this study.

Bottom Line: The geometric mean value of the ratios of time-weighted average concentrations determined from GSP and CFC samples of all personal samples was 2.88.The individual values covered a range between 1 and 17 related to differences in size distributions of the Be-containing particulates.This was supported by the area measurements showing that the conversion factor increases with increasing values of the extra-thoracic fraction covering a range between 0 and 79%.

View Article: PubMed Central - PubMed

Affiliation: 1 Fraunhofer Institute Toxicology and Experimental Medicine, Nikolai-Fuchs-Str 1, 30625 Hannover, Germany.

No MeSH data available.


Related in: MedlinePlus