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Particle size distribution (Granulometry)

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Description of key information

Total Dustiness (airborne fraction): 69.11 mg/g (experimental result, DMT Report).
Mass median aerodynamic diamaters (bimodal distribution) of airborne fraction: MMAD1 = 6.68 μm (54.0 %) , MMAD2 = 32.21 μm (46 %) (distribution fitted to cascade impactor data, percentage in
parentheses indicates weighting factor).
Geometric standard deviation: GSD1 = 1.97 μm, GSD 2 = 1.10 μm
Fractional deposition in human respiratory tract (MPPD model, based on the MMAD):
Head (ET): 63.9 %; Tracheobronchial (TB): 0.9 %; Pulmonary (PU): 2.3 %

Additional information

For the evaluation of this endpoint, data from a study (Parr, 2010; Grewe, 2010) that was conducted according to national standard (DIN 55992 -1:2006, modified Heubach method) were used as key information supported by data from a guideline compliant study (OECD 110, O'Connor and Wooley, 2010). The key study was selected based on the fact that the study considers the airborne fraction of lime (chemical) hydraulic, which is exposure-related and relevant for workplace conditions. In the other study, used as supportive information, the airborne fraction of calcium dihydroxide was not determined, but the total of the substance fed in a cascade impactor. This is not exposure-related and not relevant for workplace conditions.

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