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根据国家标准《有毒作业分级》（ＧＢ１２３３１－９０）的规定，对某焦化厂８类毒物，７４个岗位进行了分级。结果表明，０级危害岗位占２７．０３％，二级占８．１１％，三级占２２．９７％，四级占４１．８９％。炼焦工作区比副产区危害严重。研究结果表明，对焦化厂有毒作业分级有利于分级管理。作者认为，接触苯溶物工人为焦化厂的高危职业人群。
According to the national standard “Classification of Toxic Jobs” (GB12331-90), 8 coking plant toxicants and 74 posts were graded. The results showed that grade 0 hazardous posts accounted for 27.03%, grade two accounted for 8.11%, grade three accounted for 22.97% and grade four accounted for 41.89%. Coking work area than the by-product area endangered. The results show that the classification of toxic operations in coking plant is conducive to the classification management. The author believes that workers exposed to benzene solutiion coking plant for high-risk occupational groups.