An Alternative Calculation Procedure for Airborne Particulates

The current ASTM Standard Test Method for Categorization and Quantification of Airborne Fungal Structures in an Inertial Impaction Sample by Optical Microscopy (D 7391-09) has outlined the procedures for calculating airborne fungal structures (FS).

For slit impactors such as Air-O-Cell and Allergencos the calculation for fungal structures (or particulates) is based on traverses analyzed. For details click An Alternative Calculation Procedure for Airborne Particulates.

About Jackson Kung'u

Dr. Jackson Kung'u works for MBL, a laboratory that specializes in identification and enumeration of mold and bacteria commonly detected in air, fluids and bulk samples collected from homes, schools, offices, hospitals, industrial, agricultural, and other work environments. Jackson also provides a unique Mold Training Course on How to Recognize Indoor Mold, Develop Effective Sampling Strategies, Interpret Laboratory Results and how to Control Mold Growth.

Definitioner

Aspergillus: Aspergillus spp are reported to be allergenic. Members of this genus are reported to cause ear infections (see Aspergillus niger) . Many species produce mycotoxins (see Aspergillus flavus) which may be associated with disease in humans and other animals . Toxin production is dependent on the species or a strain within a species and on the food source for the fungus. Some of these toxins have been found to be carcinogenic in animal species. Several toxins are considered potential human carcinogens. Common cause of extrinsic asthma (immediate-type hypersensitivity: type I).
Aspergillus versicolor: Aspergillus versicolor is commonly found in soil, hay, cotton and dairy products. It can produce the mycotoxins sterigmatocystin and cyclopiaxonic acid . These toxins can cause diarrhea and upset stomach. It is reported to be a kidney and liver carcinogen. This species is only occasionally pathogenic.

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