The relationship between the dus t and MnO 2 concentration in electric welding circumstance is discussed in orde r to calcu late the concentration of MnO 2 from dust concentration.

• 为探讨电焊作业环境中粉尘与二氧化锰浓度的关系,以便于用粉尘浓度推算出二氧化锰浓度。