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EC number: 231-130-8
CAS number: 7440-21-3
Hobbesland et al.
the mortality pattern among employees in twelve ferroalloy plants,
including ten plants which produced silicon metal/ferrosilicon and four
plants producing ferro- or silicomanganese. The cohort comprised 14,730
workers with median duration of employment of 5.4 years in this sector
(5-95 percentiles 0.7-35.8 years) between 1933 and 1990. Results showed
only slightly increased total mortality (SMR 1.08, CI 1.04-1.11) among
ferroalloy workers when compared to expected number of deaths in the
general population. The mortality, however, correlated negatively with
the duration of employment. This suggests the effect of some lifestyle
factors on total mortality. Slight, statistically significant increases
in sudden deaths was seen, but also this correlated negatively with the
duration of employment.
cancer mortality (SMR 1.11, CI 1.02-1.20) was seen in whole cohort.
increase in respiratory tract mortality was seen. When
ferrosilicon/silicon metal furnace workers were separated, none of the
SMR's were significantly increased among workers with an employment time
of more than 3 years, whereas among workers with employment time <3
years, deaths from diseases of digestive and circulatory system as well
as accidents, poisonings and acts of violence were significantly
increased. Life-style factors may have had a remarkable contribution to
these figures. In earlier studies, which evaluated mortality and cancer
incidence in Norwegian ferroalloy industry (Langård et al. 1980; Langård
et al. 1990; Kjuus et al. 1986), no increased total mortality was
observed. According to these studies, exposures in this industry sector
has a low/negligible influence on general mortality.
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