Intercomparisons of TSI and Ecotech nephelometers
show excellent reproducibility for total scattering, although the differences are slightly larger for backscattering (Muller et al.
detect particles, then measure light scattering by the particle, and using assumptions about optical properties and density, assign a size to each particle to produce a mass concentration estimate--not a mass measurement.
At the 15 targeted nephelometer
locations, plus an additional 14 locations near the burns, trained local personnel placed passive samplers (which did not require a field operator or electricity) to measure particulate matter (RJ Lee Group, Monroeville, PA) and naphthalene (SKC Product Code: 575-003, Eighty Four, PA) for 24 to 120 hours and then sent the samplers to our laboratory for analysis.
FLC assays were performed on a Dade Behring BN II nephelometer
with FLC reagent sets from The Binding Site (Birmingham, UK).
PM measurements were taken inside and outside of each subject's residence using the Harvard impactors for integrated P[M.sub.2.5] (H[I.sub.2.5]) concentrations and using the Radiance nephelometer
(model 903; Radiance Research, Seattle, WA) at eight residences for continuous light-scattering measurements.
have proven useful in many different industries including: sewage treatment; environmental monitoring; food and beverage; chemical process control; metal works; and paper and pulp processing.
The main manufacturers of nephelometers
, Beckman-Coulter and DadeBehring, recommend serum as a sample for most tests.
The pDR, like other nephelometers
, is biased under high humidity conditions.
Turner Designs furnish laboratory type nephelometers
with analog or digital readout, adaptable to continuous flow monitoring.
are also expensive and are not used in many in small- and medium-sized clinical laboratories.
We employed portable nephelometers
providing continuous measurements and electronic data recording to optimize the temporal resolution of indoor particle levels in these homes.