Yang Zhong-Zhi,Li Yong-Fang,Li Zhi-Chun,Gu Yu-Mei,Zhu Ya,Zhang Zhan-Jun
Five higher Chlorinated Benzenes (CBs), include Hexachlorobenzene (HCB), pentachlorobenzene (PeCB) and three isomers of tetrachlorobenzens, were analyzed in 20 outdoor dust samples collected from a fast developing city, Xinxiang. Only HCB was detected in all outdoor dust samples. The dominate part of the CBs residue in most samples was HCB and the mean HCB concentration (4.13 ng/g dry weight) in this study was in the range of global background soil HCB levels (ranging from 0.010 to 5.20 ng/g dry weight). The higher ratios of HCB/PeCB in the outdoor dust samples in the present study indicate that pesticide application may be an important source of HCB in China.
Yibing Yan,Fangxiang Song,Songye Li,Tingxian Li,Qian Li,Yan Li
Accurate pesticide application enhances efficiency, reduces usage and minimizes environmental risks. This study employed amino-functionalized degradable mesoporous organosilicon nanoparticles (DMON-N) as a carrier, with chitosan (CS) acting as a capping agent. Chemical cross-linking of CS with Cu 2+ through chelation promotes the formation of Cu 2+ -CS complexes. A pH/redox dual-responsive prochloraz (PRO) delivery system (Cu-CS@PRO-DMON, CCPD) was constructed and evaluated for its potential application in controlling rice sheath blight. The successful preparation of CCPD was confirmed through a series of physicochemical characterizations. The findings demonstrated that CCPD exhibited a high PRO loading capacity (29.09 %) and that PRO could be released from CCPD for an extended duration (up to 144 h) under the influence of acidity and glutathione promotion. Furthermore, CCPD demonstrated excellent wettability (measured contact angle: 63.52 ± 0.42°), adhesion (23.83 ± 2.59 mg/cm 2 ) and resistance to rainfall washout on rice leaves. CCPD demonstrated superior antimicrobial efficacy to prochloraz technical (PRO TC) material and prochloraz emulsion in water (PRO EW). The biosafety assessment revealed that CCPD exhibited minimal acute toxicity to zebrafish, no discernible toxicological effects on human bronchial epithelial cells and no notable impact on rice.
危险品化学品经营许可证（带存储）