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EC number: 294-409-3
CAS number: 91722-09-7
Substance formed during processing of liquid steel or during production of iron castings. Consists primarily of fused silicates and trace elements as oxides as well as trace of alloying elements.
Slag stones do not exhibit any hazardous effect on any stage of early fish development e.g. fertilization of eggs, egg number, egg distribution, development of larvae.
study was conducted in the Nord-Ostsee-Channel to elucidate the effects
of stones of slag and natural rock on the reproduction of the herring,
Clupea harengus. This channel is a significant spawning ground of
herring, and every year approximately 15 millions of adult fish enter
the channel for reproduction. The estimated number of eggs is
approximately 230000 eggs/m2 of stone field, which equals approximately
83 billions of eggs in the channel (30 km length of embankment protected
with stones, width 6 m). The eggs are deposited above the stone fields,
sink to the ground and attach to the stones and the filamentous algae
growing on these stones.
From the egg
distribution data, it was apparent that herring does not prefer to slag
the natural rocks basalt, granite, and diabase as a spawning ground.
concentration of egg layers on hard ground (independent on the nature of
the stones - slag or natural rocks) was close to saturation level (104
+/- 2 % of saturation, approximately 8 mg/L, depending on e.g.
temperature and salinity).
fertilization rate of eggs was independent from the nature of the stone
fields and there was no difference between slag stone fields and the
control fields of basalt, granite, and diabase (almost complete
fertilization, at least 98.7 %)
viability of the eggs was determined from the heartbeat of the
developping larvae. Almost all larvae in the eggs deposited on hard
ground had a normal heartbeat (at least 98.3 %). Concomitantly, no
deviations from normal development were observed (Kils 1992).
From the observations of Kils, a (chronic) NOEC can be estimated. As the
exchange rate of the brackish water is low in the channel, the hight of
the water column (assumed to be 2.4 m in the slag fields) and the
thickness of the slag layers (assumed to be 40 cm) were directly
compared. Using a density of 3 for the slags, the estimated chronic NOEC
(nominal) is approximately 12 kg/24 L = 500 g/L for weathered slags in
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