**3.6. Experimental part**

Measurements were conducted under regular operation of the steelworks. For safety reasons, measuring instruments to measure quantities and distribution of aerosol nanoparticles were situated only in the following locations:


Experiences with Anthropogenic Aerosol Spread in the Environment 447

**3.7. Distribution of nanoparticles in the premises of the continual casting** 

by averaging the collected spectrums is shown in the diagram in Figure 31, Table 9.

**Figure 31.** Distribution of aerosol particles in the measuring location a)

**Overall concentration (N·cm-3)** 

**Table 9.** Measured physical values of nanoparticles – point a)

measurement was performed also played a role.

The average flow rate in the first location was 0.12 m·s-1 (determined with TESTO 445 with a thermal probe). 6 spectrums were measured in total with the distribution of size of aerosol particles ranging from 14 to 736 nm. The distribution of the size of aerosol particles obtained

The mode of the collected spectrum is around 20 nm. The presented spectrums indicated

**Total surface of the particles (nm2·cm-3)** 

**Total volume of the particles (nm3·cm-3)** 

**Total weight of the particles (µg·m-3)** 

presence of particles under 10 nm, which may be estimated from the size distribution

Average values 3.57 . 104 6.46 . 108 2.33 . 1010 28

obtained in this measurement location is shown in the diagram in Figure 32, Table 10.

The average flow rate in the location was 0.27 m·s-1. The distribution of size of aerosol particles

The higher flow rate has probably also affected the uneven distribution of the size of aerosol particles. The different technological development of the operation during which the

**equipment** 

*3.7.1. Measuring point a)* 

**Measuring point a)** 

*3.7.2. Measuring point b)* 

**Figure 29.** Measuring point at the slab continual casting

**Figure 30.** Measuring point in the steelworks dispatching section (at the scarfing machine)

Measurements of particles trapped in personal cascade impactors were performed in the convertor hall of the steelworks in 2 selected locations under the technological conditions described below.
