血红蛋白在碳纳米管-聚苯胺修饰电极上的直接电化学行为研究

利用滴涂法将血红蛋白(Hb)和多壁碳纳米管(MWNT)-聚苯胺纳米纤维(PANnano)复合纳米粒子修饰到碳糊电极(CPE)表面,并对其电化学行为进行研究。实验结果表明,血红蛋白在PANnano/MWNT膜内保持了其天然构象和较好的直接电化学行为。     

脱脂溶液中COD的测定

化学需氧量（COD）是一个非常重要的参数。本文简要介绍了COD的测定原理、测定方法和注意事项。     

Photochemical degradation and toxicity reduction of methyl 1-[(butylamino)carbonyl]-1H-benzimidazol-2-ylcarbamate in agricultural wastewater: Comparative study of photocatalysis and sonophotocatalysis

Photochemical degradation and relative toxicity reduction of agricultural wastewater contaminated with methyl 1-[(butylamino)carbonyl]-1H-benzimidazol-2-ylcarbamate (benomyl) by the sonophotocatalytic system was compared with that of the photocatalytic system. Under the optimal conditions, i.e., initial benomyl concentration was 3.2 mg/L, the concentration of TiO₂ was 2 g/L and H₂O₂ concentration was 1.5 mM, the degradation rates with a sonication/UV/TiO₂ system was about 1.5 times higher than with a UV/TiO₂ system and sonication/UV/TiO₂/H₂O₂ system was about 1.3 times higher than with a UV/TiO₂/H₂O₂ system, respectively. Furthermore, the relative toxicity with a sonophotocatalysis was about 18% lower than with a photocatalysis within a reaction time of 120 min.     

W11-4N油田海管在线清垢作业现场试验

为了验证在线清垢剂的清垢效果。解决W11-4N油田海管结垢堵塞问题,开展了为期45d的低含水输送海管在线清垢现场试验工作。结果表明．清垢作业试验获得成功。清垢达到了预定目标。海管进口压力和海管进出口压差均大幅下降,降幅均约为130kPa。且在作业后期稳定在此数值左右;清垢作业结束时。海管输送液分离水样中Ca抖浓度下降并稳定在520-600mg·L^-1,接近作业前期浓度（500-580mg·L^-1）;清垢作业完成后,拆卸发球阀外观结垢已彻底清除．且无明显腐蚀迹象．海管输送液分离水样中Fe抖浓度稳定在0．2～0．3mg·L^-1,清垢作业期间海管腐蚀速率比加清垢剂前大大降低;清垢作业的返出液对油水分离处理无明显影响;清垢作业完成后,W11-4N油田生产稳定,外输6英寸海管保持日输送液量为1330m^3,海管输送压力稳定正常。     

GB18581-2009标准中苯系物含量测试方法的改进和讨论

为了贯彻执行GB18581-2009标准,对标准中附录B规定的苯、甲苯、乙苯和二甲苯测试方法进行了试验,提出了一些看法并作了改进,缩短了分析时间、提高了分析的重复性和准确性。目的是与业内同行进行交流,使新标准在整个涂料行业中能够更好地贯彻和实施。