Usheva-Georgieva G
Probl Khig. 1975;1:53-5.
The MAC for lead in the workplace atmosphere adopted in Bulgaria, amounting to 0.01 mg/m3, appears to be much lower than abroad. Upon investigation of groups of workers employed in the lead mining and processing industry, working under conditions of lead exposure up to 0.10 mg/m3 and exceeding 0.11 mg/m3, no changes were found in the delta-amino-levulinic acid and coproporphyrin level in the urine--the early signs of lead damage--nor in plumburia mong the workers exposed to lead concentrations up to 0.10 mg/m3 which is a concentration exceeding ten times the MAC accepted in this country. A reassessment of the later on the basis of up-to-date biochemical criteria is deemed necessary.
保加利亚采用的工作场所空气中铅的最大允许浓度为0.01毫克/立方米，这一数值似乎远低于国外。在对铅矿开采和加工业的工人组进行调查时，这些工人分别在铅暴露浓度高达0.10毫克/立方米和超过0.11毫克/立方米的条件下工作，结果发现，作为铅损害早期迹象的尿中δ-氨基乙酰丙酸和粪卟啉水平没有变化，而且在铅浓度高达0.10毫克/立方米（该浓度超过该国所接受的最大允许浓度十倍）的工人中也未发现铅中毒现象。因此，有必要根据最新的生化标准对其进行重新评估。
