反击式破碎机主轴的强度分析及优化

对工作状态下反击式破碎机的主轴建立力学模型,采用材料力学的方法对主轴的危险截面进行静强度校核;计算主轴挠度、扭转刚度,检验其是否满足设计要求。采用有限元法,计算主轴具体应力分布,确定危险点的位置和应力集中系数,在此基础上对主轴的疲劳强度进行计算。根据分析结果对主轴结构进行优化,改善部分部位的应力集中,并且使主轴的质量降低了8%

固相萃取-气相色谱/质谱联用法同时检测水体中9种环境雌激素

建立了固相萃取-气质联用法(SPE-GC-MS)测定水体中9种环境雌激素:雌酮(E1)、17b-雌二醇(E2)、雌三醇(E3)、4-辛基酚(OP)、4-壬基酚(NP)、双酚A(BPA)、己烯雌酚(DES)、美雌醇(EE3ME)和17a-炔雌醇(EE2)的检测方法,优化了萃取和衍生化反应条件,实验结果表明:HLB柱回收率较高,衍生化反应的温度为75℃,衍生时间为90 min;本方法对9种环境雌激素的加标回收率为60.5%～126.7%,对应的相对标准偏差为0.8%～11.1%,方法检出限为1.08～8.6

Simultaneous Detection of Nine Kinds of Estrogens in Water by Solid Phase Extraction Coupled with Gas Chromatography-Mass Spectrometry

Nine target compounds including estrone (E-1), 17 beta-estradiol (17 beta-E-2), estriol (E-3) 4-octylphenol(4-OP), 4-nonylphenol (4-NP), bisphenol A (BPA), diethylstilbestrol (DES), mestranol (EE3ME) and 17 alpha-ethinyl estradiol (17 alpha-EE2) were simultaneous detected by SPE-GC-MS. Extraction and derivatization conditions were optimized. The results showed that the average recoveries of the nine target estrogens extracted by Oasis HLB cartridges were higher than those by Satara cartridges, the optimal temperature of derivatization reaction was 75 degrees C and the optimal time of derivatization reaction was 90 min. The average recoveries of the nine target estrogens by Oasis HLB cartridges were 60.5% - 126.7%, and the relative standard deviations (RSD) were 0.8% - 11.1%, and the limits of detection (LOD) ranged from 1.08 ng/L to 8.60 ng/L. This method has been employed to detect the estrogens in environment samples from rivers

Simultaneous Detection of Nine Kinds of Estrogens in Water by Solid Phase Extraction Coupled with Gas Chromatography-Mass Spectrometry

Nine target compounds including estrone (E-1), 17 beta-estradiol (17 beta-E-2), estriol (E-3) 4-octylphenol(4-OP), 4-nonylphenol (4-NP), bisphenol A (BPA), diethylstilbestrol (DES), mestranol (EE3ME) and 17 alpha-ethinyl estradiol (17 alpha-EE2) were simultaneous detected by SPE-GC-MS. Extraction and derivatization conditions were optimized. The results showed that the average recoveries of the nine target estrogens extracted by Oasis HLB cartridges were higher than those by Satara cartridges, the optimal temperature of derivatization reaction was 75 degrees C and the optimal time of derivatization reaction was 90 min. The average recoveries of the nine target estrogens by Oasis HLB cartridges were 60.5% - 126.7%, and the relative standard deviations (RSD) were 0.8% - 11.1%, and the limits of detection (LOD) ranged from 1.08 ng/L to 8.60 ng/L. This method has been employed to detect the estrogens in environment samples from rivers

Gsm和2-Mib在斑马鱼体内的富集及暂养效果研究

利用固相微萃取-气质联用和内标定量技术建立了水体和斑马鱼体内土臭素(Gsm)和二甲基异冰片(2-Mib)的分析方法,并利用该方法研究水体中Gsm和2-Mib在斑马鱼体内的富集和暂养效果。结果表明,水体中不同浓度Gsm和2-Mib的添加回收率范围为97.2%~109.9%和88.5%~101.6%,斑马鱼中不同浓度Gsm和2-Mib的添加回收率范围为78.5%~87.2%和88.3%~91.4%;水体中不同浓度的Gsm和2-Mib能在鱼体内较快富集,鱼体内Gsm和2-Mib浓度和水体中的浓度成正相关;鱼体内Gsm和2-Mib的浓度和暂养时间成反相关,但降低较慢。水体中的Gsm和2-Mib通过鱼鳃和体表迅速富集到鱼体中,成为鱼体土腥味来源的主要外源因子,清水暂养对土腥味物质Gsm和2-Mib的去除有一定作用,但仍需配合其他去除方法使用效果更佳

Gsm和2-Mib在斑马鱼体内的富集及暂养效果研究

利用固相微萃取-气质联用和内标定量技术建立了水体和斑马鱼体内土臭素(Gsm)和二甲基异冰片(2-Mib)的分析方法,并利用该方法研究水体中Gsm和2-Mib在斑马鱼体内的富集和暂养效果。结果表明,水体中不同浓度Gsm和2-Mib的添加回收率范围为97.2%~109.9%和88.5%~101.6%,斑马鱼中不同浓度Gsm和2-Mib的添加回收率范围为78.5%~87.2%和88.3%~91.4%;水体中不同浓度的Gsm和2-Mib能在鱼体内较快富集,鱼体内Gsm和2-Mib浓度和水体中的浓度成正相关;鱼体内Gsm和2-Mib的浓度和暂养时间成反相关,但降低较慢。水体中的Gsm和2-Mib通过鱼鳃和体表迅速富集到鱼体中,成为鱼体土腥味来源的主要外源因子,清水暂养对土腥味物质Gsm和2-Mib的去除有一定作用,但仍需配合其他去除方法使用效果更佳

Gsm和2-Mib在斑马鱼体内的富集及暂养效果研究

利用固相微萃取-气质联用和内标定量技术建立了水体和斑马鱼体内土臭素(Gsm)和二甲基异冰片(2-Mib)的分析方法,并利用该方法研究水体中Gsm和2-Mib在斑马鱼体内的富集和暂养效果。结果表明,水体中不同浓度Gsm和2-Mib的添加回收率范围为97.2%~109.9%和88.5%~101.6%,斑马鱼中不同浓度Gsm和2-Mib的添加回收率范围为78.5%~87.2%和88.3%~91.4%;水体中不同浓度的Gsm和2-Mib能在鱼体内较快富集,鱼体内Gsm和2-Mib浓度和水体中的浓度成正相关;鱼体内Gsm和2-Mib的浓度和暂养时间成反相关,但降低较慢。水体中的Gsm和2-Mib通过鱼鳃和体表迅速富集到鱼体中,成为鱼体土腥味来源的主要外源因子,清水暂养对土腥味物质Gsm和2-Mib的去除有一定作用,但仍需配合其他去除方法使用效果更佳