Pumure I, Sithole S D, Kahwai S G T
Department of Chemistry, Bindura University of Science Education, Bindura, Zimbabwe.
Environ Monit Assess. 2003 Sep;87(2):111-21. doi: 10.1023/a:1024646115062.
Particulate matter emissions from stack number 2 of a major ferrochrome smelter, Zimbabwe Mining and Smelting Company (ZIMASCO) were characterized and the rates at which the elements Cr, Fe, Cu and Zn and total ferrochrome dust are emitted into the atmosphere were determined. The extent of soil contamination by the dust deposited around the smelter in the generally prevailing southeasterly wind direction around the smelter was carried out. The highest concentrations of Cr and Fe occurred in the fine particulates of sizes less than 59 microm whilst that of Cu and Zn occurred in the coarse particulates of size range 70-100 microm. The emission rates from stack 2 were; total ferrochrome particulates 62.17 kg h(-1), Cr 6.217 kg h(-1), Fe 2.423 kg h(-1), Zn 42 mg h(-1) and 6 mg h(-1) for Cu. Particulate matter was emitted at a rate of 289 mg m(-3) from stack number 2. This value exceeds the legal limit of 200 mg m(-3). Chromium and iron are the metals in the largest amounts. The particles that constitute the largest proportion of the dust were in the range of 58-107.5 microm. This is a characteristic feature of the particulate matter emissions from ZIMASCO. Soils in the downwind direction from the smelter were polluted with Cr up to a distance of about 700 m outward from the perimeter of the boundary of the smelter.
对津巴布韦矿业和冶炼公司（ZIMASCO）一座大型铬铁冶炼厂2号烟囱的颗粒物排放特征进行了研究，并测定了铬（Cr）、铁（Fe）、铜（Cu）和锌（Zn）元素以及总铬铁粉尘排放到大气中的速率。对冶炼厂周围普遍盛行的东南风方向沉积的粉尘对土壤的污染程度进行了调查。Cr和Fe的最高浓度出现在粒径小于59微米的细颗粒物中，而Cu和Zn的最高浓度出现在粒径范围为70 - 100微米的粗颗粒物中。2号烟囱的排放速率为：总铬铁颗粒物62.17 kg h⁻¹，Cr 6.217 kg h⁻¹，Fe 2.423 kg h⁻¹，Zn 42 mg h⁻¹，Cu 6 mg h⁻¹。2号烟囱颗粒物的排放速率为289 mg m⁻³。该值超过了200 mg m⁻³的法定限值。铬和铁是含量最多的金属。构成粉尘最大比例的颗粒粒径在58 - 107.5微米范围内。这是ZIMASCO颗粒物排放的一个特征。冶炼厂下风方向的土壤被Cr污染，污染范围从冶炼厂边界向外延伸约700米。
