mineral dust


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mineral dust

A very finely divided mineral product, the greatest bulk of which will pass through a 74-micron (No. 200) sieve; the most common such material is pulverized limestone.
References in periodicals archive ?
In the past decade several comprehensive airborne dust field experiments including the Saharan Mineral Dust Experiment (SAMUM-1, Heintzenberg 2009; SAMUM-2, Ansmann et al.
It should also be noted from this plot that Arizona Test dust (ATD) and Saharan Dust have been identified as the more efficient mineral dust ice nuclei, while kaolinite and the proxy NX illite are relatively inefficient.
Although large storms can export vast amounts of mineral dust to the open ocean, the amount of sulfur dioxide required to acidify these large plumes and generate bioavailable iron is about five to 10 times higher than the average .
The Factories Inspectorate reported in 1898 that "microscopic examination of this mineral dust shows the jagged nature of the particles and wherever they are allowed in this manner to remain suspended in the air, injury, more or less serious, ensues for the respiratory organs of the workers.
It is about 3 kilometers thick, and contains soot, sulphates, nitrates, organic particles, fly ash, mineral dust, and high concentrations of gases such as carbon monoxide and sulfur dioxide.
MPL and MiniMPL are also being used around the world to measure the distribution of volcanic dust and tracking of volcano plumes , as well as tracking of plumes from mineral dust storms and other sources.
Objective: "The goal of this innovative, inter-disciplinary project is to explain the role of mineral dust during key climate periods through its feedbacks on the global carbon cycle and climate.
The following is a nonexhaustive review of the pathology of some of the small airways diseases, specifically cellular bronchiolitis, including follicular bronchiolitis and diffuse panbronchiolitis; granulomatous bronchiolitis; tobacco smoke-associated small airways bronchiolitic diseases, hypersensitivity pneumonitis; organizing pneumonia; constrictive bronchiolitis; mineral dust exposure and various other exposure-associated bronchiolitic diseases; and 4 recently described bronchiolitic disorders, bronchiolitic disease due to ingestion of Sauropus androgynus, airway-centered interstitial fibrosis, idiopathic bronchiolocentric interstitial pneumonia, and bronchiolitis interstitial pneumonitis.
By determining the chemical composition of the very cores of individual ice particles, they discovered that both mineral dust and, surprisingly, biological particles play a major role in the formation of clouds," she added.
Massive dust storms sweep the world's deserts only a few times each month and contribute about 8 percent of the mineral dust that reaches the atmosphere each year.
Wind- and vehicle-generated mineral dust from open land and roads is a major source of PM, especially in arid climates, and each dust sample is a complex mixture of different particle shapes and sizes that are derived from various geological minerals, biogenic debris, and anthropogenic materials deposited from the atmosphere.