Field Validation Study Research Articles

Field validation study of NO2 personal passive samplers in a "diesel" haulage underground mine.

Three passive samplers are now commercially available for NO2. This field validation, conducted in an underground mine, attempted to address both the precision and accuracy of the three now commercially available. The probable sources of NO2 were identified as diesel engines and blasting operations. Comparative sampling was conducted with the passive samplers versus the standard "baseline" impingement method. The three NO2 samplers were as follows: 1) PRO-TEK (DuPont); 2) Palmes (MDA); 3) VaporGard (MSA). Three sets of data consisting of impingers and passive sampler results were taken on top of a moving diesel vehicle over a three-day period. An expanded metal screen was welded in a "free standing" plane above the vehicle to serve as a sampling platform. The evaluation of concentration data suggested that correlations of accuracy and precision versus the impinger method were best for the Palmes and VaporGard samplers. The PRO-TEK sampler does not seem to produce accurate data, but it is somewhat precise. Factors of sensitivity, accuracy, precision, cost, ease of analysis, and stability must be weighed.

Field Validation Study of NO2 Personal Passive Samplers in a “Diesel” Haulage Underground Mine

Three passive samplers are now commercially available for NO2. This field validation, conducted in an underground mine, attempted to address both the precision and accuracy of the three now commercially available. The probable sources of NO2 were identified as diesel engines and blasting operations. Comparative sampling was conducted with the passive samplers versus the standard “baseline” impingement method. The three NO2 samplers were as follows: 1) PRO-TEK® (DuPont); 2) Palmes® (MDA); 3) VaporGard® (MSA). Three sets of data consisting of impingers and passive sampler results were taken on top of a moving diesel vehicle over a three-day period. An expanded metal screen was welded in a “free standing” plane above the vehicle to serve as a sampling platform. The evaluation of concentration data suggested that correlations of accuracy and precision versus the impinger method were best for the Palmes and VaporGard samplers. The PRO-TEK sampler does not seem to produce accurate data, but it is somewhat precise. Factors of sensitivity, accuracy, precision, cost, ease of analysis, and stability must be weighed.

Metoda określania zagęszczenia w populacjach małych ssaków przy użyciu działki odłownej i transektów

Swift D. M. & Steinhorst R. K., 1976: A technique for estimating small mammal population densities using a grid and assessment lines. Acta theriol., 21, 32: 471—480 [With 2 Tables & 1 Fig.]. A technique, for estimating densities of small mammal populations utilizing live trapping on a grid and assessment lines is presented. Information from the assessment lines permits estimation of the area of effect of the grid and of the proportion of the population marked within that area. These, in conjunction with the number of animals known to have marked on the grid, yield a Lincoln Index-type of estimate of population density. Results of a field validation study of the technique are presented.