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芬兰某钒工厂用磁铁矿矿石制备五氧化钒。该厂有79名工人,通过呼吸系统症状调查表、肺部X线片和通气功能试验FVC和FEV_1,共调查了63人。另选当地63名工人作对照组进行比较。两组年龄相仿,相差不超过两岁,吸烟习惯相仿,每天不超过五支。此次调查发现钒工厂空气中钒浓度较低,一般车间不超过0.1mg/m~3,这与1976年以来实行地面彻底冲洗制度有关。超过美国阈限制0.5mg/m~3者
A Finnish vanadium plant uses magnetite ore to make vanadium pentoxide. The plant has 79 workers and 63 people were surveyed through the Respiratory Symptom Inventory, Lung X-ray and Ventilation Function Tests FVC and FEV_1. Another 63 local workers were selected as control group for comparison. Two groups of similar age, a difference of not more than two years old, similar to smoking habits, no more than five daily. The survey found vanadium factory air vanadium concentration is low, the general workshop does not exceed 0.1mg / m ~ 3, which has been implemented since 1976, the ground thoroughly washed system. More than the United States threshold limit 0.5mg / m ~ 3