Monitoring bioaccumulation and toxic effects of hexachlorobenzene using the polyurethane foam unit method in the microbial communities of the Fuhe River, Wuhan

Hexachlorobenzene (HCB) is a chlorinated aromatic hydrocarbon that was widely used for seed dressing in prevention of fungal growth on crops, and also as a component of fireworks, ammunition, and synthetic rubbers. Because of its resistance to degradation and mobility, HCB is widely distributed throughout the environment and is accumulated through food chains in different ecosystems. In this study, a preliminary investigation was carried out on the bioaccumulation and the toxic effects of HCB in the microbial (protozoan in particular) communities in the Fuhe River, Wuhan, a water body receiving industrial wastewaters containing HCB and other pollutants, using the standardized polyurethane foam units (PFU) method. Field samples were taken from eight stations established along the Fuhe River in January and August 2006. The concentration ratios of HCB in microbial communities and in water were 9.66-18.64, and the microbial communities accumulated 13.29-56.88 mu g/L of HCB in January and 0.82-10.25 mu g/L HCB in August. Correlation analysis showed a negative correlation between the HCB contents in the microbial assemblage, and the number of species and the diversity index of the protozoan communities. This study demonstrated the applicability of the PFU method in monitoring the effects of HCB on the level of microbial communities.

危险弹药销毁用聚能引爆器设计

为解决炸药包殉爆销毁存在的诸多问题,适应新形势下部队训练保障要求,依据前人关于聚能装置设计经验和聚能效应原理,着重阐述了炸药、药型罩、炸高、外壳等重要参数设计原则及其选取依据,设计了一种用于危险弹药销毁的新型装置.为检验聚能引爆器侵彻引爆销毁危险弹药的能力,选取了5种典型弹药进行实弹销毁试验.试验结果表明:该装置能够引爆不同弹丸装药、不同弹体材料、不同弹丸壁厚的危险弹药,用于销毁危险弹药是可行的