Quartz, kaolinite, calcite, pyrite and illite were the most prevalent minerals in bulk dust samples.
Small (mean particle diameter = 2.9 ± 1.0 μm), reactive lunar dust particles were produced by grinding bulk dust under ultrapure nitrogen conditions.
Bulk dust samples and size-selective airborne dust samples were collected from four areas of a primary lead smelter and analyzed by X-ray diffrandion and sequential chemical extraction.
Differences could be due to collection methods (surface sample versus bulk dust) and specificity in questions (e.g., questions about individual pests vs. any indoor pests).
For studies with environmental measures, we focused on pesticide levels in residential dust (including bulk dust and surface wipe samples) and assumed they would be representative of women's exposures, although they would be applicable to all household members.
The later steps of the extraction procedure were more effective in dissolving the lead compounds associated with the bulk dust samples, with 43%, 26%, and 8% of the total lead, in the ore storage, sinter, and blast/dross smelter areas, respectively, being extracted in the residual step.
Flammable solid bulk materials, including dusts, often undergo spontaneous combustion and the spread of reaction fronts.
The physical properties reported were as follows: particle size distributions and surface area measurements using a Coulter Counter Model TAII; percent dust fractions less than 100 micron of whole dust; bulk density; particle density; and ash content.
Loading and unloading of dry bulk cargoes generates dust, and port facilities must install extensive systems to collect dust particles.
The impact plasma flux to the spacecraft is thus (4 where is the dust mass flux and q d = 103 kg m−3 is the dust bulk density.
