A new one-dimensional coordination polymer synthesized from zinc and guanazole: Superior capture of organic arsenics

Organic arsenic compounds in the environment are a global threat to human health. This threat has created the urgency to develop highly efficient adsorbents with both high adsorption capacity and versatile removal of different arsenic compounds. A novel 1D zinc(II) coordination polymer, formulated as Zn₂(datrz)₂(bpy)Cl₂ ( BUC-70 ) (datrz = guanazole, bpy = 4,4′-bipyridine), was successfully synthesized through slow evaporation at room temperature. BUC-70 exhibited an excellent adsorption capacity toward p-arsanilic acid (p-ASA) and roxarsone (ROX) in water, which could be ascribed to As–O–Zn bonding interactions and strong hydrogen-bonding interactions between the organic arsenics and BUC-70 . The maximum adsorption capacities toward p-ASA and ROX were 738 and 937 mg·g⁻¹, respectively. BUC-70 was effective in the removal of p-ASA and ROX at low concentrations (<5 mg·l⁻¹) from the simulated p-ASA and ROX wastewater. Furthermore, the as-synthesized BUC-70 exhibited good adsorption property toward p-ASA and ROX in wastewater simulated by lake water and tap water. After adsorptive treatment using BUC-70 , the concentrations of both p-ASA and ROX were lower than the required concentrations of the drinking water standard of the World Health Organization and the surface water standard of China. Continuous-flow, fixed-bed column experiments were performed using BUC-70 loaded on cotton as packing material to explore the potential large-scale application.     

高效液相色谱-电感耦合等离子体质谱测定饲料中有机胂的研究

研究建立了高效液相色谱-电感耦合等离子体质谱测定饲料中有机胂-洛克沙胂(ROX)和阿散酸(p-ASA)的方法。用反相高效液相色谱(Rp-HPLC)分离ROX和p-ASA,用电感耦合等离子体质谱(ICP-MS)在线分析砷含量,并与ROX和p-ASA标准色谱图和工作曲线对照,实现了对ROX和p-ASA两种常见的饲料添加胂制剂的分析。优化了液相色谱分离条件、电感耦合等离子体质谱的检测条件和提取条件,考察了样品基体对ROX和p-ASA的干扰。在优化条件下,ROX和p-ASA的检出限分别为0.6 ng/g和0.2 ng/g;不同浓度的ROX和p-ASA添加回收率为82.7%~97.6%;相对标准偏差低于8.1%。本方法操作简便,灵敏度高,重现性好,适合于饲料中ROX和p-ASA分析。