The effects of oxygenation aeration treatment on dissipation behaviors of tricaine mesylate in carp (Cyprinus carpio) muscle and water

Tricaine mesylate (MS-222) is one of the most used anesthetics in fish. It can be absorbed by the human body via food consumption, with related detriments to human health. In this study, a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was developed for the determination of MS-222 in carp muscle and water samples using liquid chromatography-tandem mass spectrometry (LC-MS/MS). For cleanup procedure, multiplug filtration cleanup (m-PFC) method with n-Hexane delipidation was adopted. The extraction solvent, cleanup methods and sorbents were optimized. All method validation parameters were in the acceptable range. The dissipation behavior study was followed by the method development. Firstly, the anesthesia dose and time were optimized in application study. Secondly, carps were revived for different period of time with (experimental group) and without (control group) the oxygenation aeration treatment to compare the dissipation rate of MS-222. After being anesthetized for 6 h at 50 mg/L and 12 h of elimination, the concentrations of MS-222 in crap muscle and water of experimental group was lower than those of control group. After 36 h of elimination under oxygenation aeration, over 90% of MS-222 was dissipated in carp muscle. The results showed that the half-life of MS-222 in carp muscle was 6.2 h. The findings suggested that the commonly-used oxygenation aeration treatment in aquaculture production had potential effects in accelerating the dissipation of MS-222 in carp and water. In this study, three days of withdrawal period was recommended in carps after MS-222 administration under oxygenation aeration.     

新型PSA吸附剂在制氢装置上的应用

由于原料变化及PSA(变压吸附)能力限制,中国石油天然气股份有限公司大庆石化分公司(大庆石化)炼油厂制氢装置实际的产氢能力达不到用氢需求,在油品升级国Ⅳ、国Ⅴ时存在氢气缺口,根据大庆石化氢气平衡情况,为保证炼油厂油品升级的顺利完成,需要将制氢装置PSA提纯系统能力提高到44 dam3/h,以解决由于制氢装置中变气PSA能力不足带来的油品升级困难。2015年7月,对大庆石化炼油厂制氢装置进行了扩能改造,采用了HX5A-10H,HXNA-CO/10新型吸附剂,此种吸附剂相对传统的吸附剂具有强度高、吸附容量大、堆密度大等特点,使PSA装置吸附剂的装填比例更加优化,吸附剂动态吸附容量提高,同时进一步减小了吸附塔死空间,提高了PSA装置氢气收率及氢气产量,中变气PSA装置出口氢气纯度能够达到99.9%,氢气收率达到90%以上,为炼油厂油品升级提供了稳定的氢气保障。     

清洗工艺对变压吸附制氧的影响

通过一套小型两塔变压吸附制氧实验装置,研究了小流量连续清洗与大流量瞬间清洗两种不同清洗工艺对变压吸附制氧性能的影响。实验结果表明,在保持产氧量相同的情况下,分别采用两种清洗工艺均可大幅提高产氧浓度,得到最高约91%的产品氧气浓度,产氧浓度对大流量瞬间清洗时间的变化更为敏感;而同时采用两种清洗工艺时,最高产氧浓度可达93%以上。     

芳砜纶针刺非织造布耐酸性能研究

芳砜纶针刺非织造布经过硫酸溶液处理后,纤维断裂强度略有下降,纤维线密度减小;非织造布的尺寸稳定性很好,而其断裂强力却有明显增加。通过对针刺加固形式的纤维缠结模型的力学分析表明:芳砜纶经硫酸溶液处理后变细,在非织造布受拉伸时有助于增强纤维间的缠结并可以提高针刺缠结加固方式对纤维强度的利用率。     

H2O2-铁炭法预处理冷轧带钢厂镀锡废水

冷轧厂电镀锡生产过程中产生的废水含有大量的有机物,COD浓度高,pH值在1.1～2.0之间,很难直接进行生化处理.为提高生化处理效果,以H2O2-铁炭柱-pH调节-混凝为处理工艺进行前处理,结果表明,空速为3 h-1、H2O2/COD为1.5(质量比)、pH为8左右、PAM加入量为15 mg/m3时处理效果最好.利用该方法处理冷轧厂镀锡废水,可有效降低COD的浓度, Sn2 被氧化成高价态后沉淀除去,为废水进入后续的生化处理提供了保障.     

血清PSA及PAP测定的临床应用评价

报道了２３例前列腺癌、４２例良性前列腺增生及２１例男性非前列腺疾病住院患者血清ＰＳＡ及ＰＡＰ联合测定结果。前列腺癌组与良性前列腺增生及对照组比较有极显著差异，按决策矩阵法对血清ＰＳＡ及ＰＡＰ进行临床综合评价，两者诊断指数和可用度分别为１３５．８％、１３８。３％和０．３６、０．４５。结果表明血清ＰＳＡ及ＰＡＰ测定对于前列腺癌诊断及鉴别诊断为互补关系，血清ＰＳＡ测定作为前列腺癌治疗效果监测指标优于血清     

浅析膜分离和变压吸附技术在甲醇生产中的应用

分别论述了采用变压吸附法(PSA)和膜分离法回收甲醇合成放空气的特点，对2种回收方法的回收量、回收率和各项技术经济指标进行了对比，结果表明，膜分离技术的有效气体总回收率、惰性气体排放率均高于PSA。能耗低于PSA。     

承压式氨分解器及其应用前景

传统的氨分解器产气压力均低于0．1MPa，本文介绍一种产气压力为0．5MPa的氨分解器，并对其承压式的结构特点及原理进行了较为详细的介绍以及列举了该装置的应用实例。     

PSA制氧设备在电炉炼钢的应用

文章对ＰＳＡ制氧设备的工艺流程、特点及在电炉炼钢的应用进行了论述，介绍了运行装置综合技术经济指标．     

"变压吸附"疲劳容器使用应注意的问题

介绍了“变压吸附”使用的疲劳容器以及使用过程中应注意的检查事项。