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生物柴油中游离甘油含量,是评价生物柴油质量好坏的重要指标之一.本研究提出的用自制的大容量C18SPE小柱直接吸附、保留生物柴油中主成分,消除了大量长链脂肪酸单烷基酯对微量游离甘油测试的干扰,甲醇淋洗出生物柴油中的游离甘油,再用定量的流动相溶解甘油,高压液相色谱直接测定溶解的甘油,该法不仅能满足GB/T 20828-2007中对生物柴油中游离甘油测试的要求,而且方便、快捷,可用于各种生物柴油中游离甘油的测试.方法相对标准偏差为0.6%-8.8%（n=6）,回收率为95.7-105.7%,检测下限为0.042 mg/mL（S/N=3）. 相似文献
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建立了柑橘中农药2,4-二氯苯氧乙酸（2,4-D）残留量的高效液相色谱（HPLC）测定方法．样品用乙酸乙酯超声波提取,硅藻土固相萃取预处理并富集浓缩10倍后HPLC分离测定．结果表明,测定2,4-D的线性范围是1．00~20．00mg·kg,市售六种柑橘类水果中2,4-D含量在O．28～O．90mg·kg,结果的相对标准偏差为0．6％～2．6％,2,4-D回收率为86％～92％． 相似文献
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样品制备技术是农药多残留分析的关键．本文回顾了农药多残留分析样品制备技术的研究现状,着重介绍了固相萃取、固相微萃取、基质固相分散萃取、分散固相萃取、凝胶渗透色谱、超临界流体萃取、加速溶剂萃取的基本原理及在农药多残留分析中的应用情况,并对这些技术在农药多残留分析中的应用情况进行比较,展望了农药多残留分析样品制备技术的发展趋势。 相似文献
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颜宁 《云南师范大学学报(哲学社会科学版)》2007,39(6):112-116
20世纪60年代《英语语音模式》(SPE)的问世标志着生成音系学终于冲破结构主义的羁绊成为了一门崭新的学科。在随后的几十年中,生成音系学的标准理论在实践中不断经受检验并得到更新,各种以非线性音系为核心的理论学派推陈出新,它们采用独特新颖的多元研究视野,在SPE的基础上实现了质的飞跃。 相似文献
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温一慧 《天水师范学院学报》2003,23(5):14-15
在Sin-Min Lee和温一慧关于SPE(3K2 , f )图超魔性研究的基础上还可以就 SPE(3K2 , f ) 图的超魔性问题得出两个补充结果，推广和完善上述研究的结论。 相似文献
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Chandramallika Paul Subhosmito Chakraborty S. Sugumar Ranjan Bhattacharya Sandip Rath Sarit Chakraborty 《Indian journal of clinical biochemistry : IJCB》2021,36(3):353
Multiple myeloma (MM) is diagnosed and monitored by correlating panel of test results including serum Protein electrophoresis (SPE), Immunofixation electrophoresis (IFE), serum Free Light chain (sFLC) measurements. This audit is aimed to evaluate the prevalence of non-correlation and discrepancies amongst the three investigations (SPE/IFE/sFLC) for assessment of MM. 106 MM patients were reviewed over 16 months in a tertiary cancer care center by the availability of 3 serum test results (SPE/IFE/sFLC). Patients were divided into 2 groups: group1, newly diagnosed MM patients who were yet to receive myeloma specific treatment (n = 48); and group2, already diagnosed MM patients on treatment and followup (n = 58). Treatment modalities included stem cell transplantation and standard chemotherapy regimens. Non-correlation between the three test results (IFE/SPE/sFLC) was observed (21% in group1 and 45% in group2). Three types of discrepancies were detected as follows: (a) IFE showing less number of restriction bands as compared to SPE (8.6% patients in group2); (b) SPE/IFE negative with an abnormal sFLC ratio (12.5% patients in group1 and 13.7% in group2); (c) SPE/IFE positive but normal sFLC ratio (8% in group1 and 22% in group2). To conclude, IFE may sometimes provide information that does not always correlate with either of the SPE or sFLC results due to different sensitivities, antigen–antibody interactions, or treatment. Hence, SPE plus sFLC may be more useful particularly for patients on follow-up while IFE plus sFLC may help screen the new patients. The judicious selection of the biochemical assays can effectively reduce the treatment cost in a developing country like India. 相似文献
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建立了快速、高效的酱油中三氯丙醇的固相萃取净化-气相色谱-串联质谱法（GC—QqQ—MS／MS）测定方法。0．5g酱油,加0．5mL饱和NaCl盐析,超声15min后经弗罗里硅土固相萃取柱净化,无水乙醚洗脱,d,-3-MCPD为内标,七氟丁酰基咪唑衍生化,加饱和NaCl3mL混匀,有机层进GC—QqQ—MS／MS分析。净化时间少于20min。方法回收率为101．36％,线性范围在0．05-5．0mg／ks,线性相关系数R2=O．99997,方法检出限为0．005mg／kg,该方法对酱油中三氯丙醇的测定有良好的效果。 相似文献
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Zhi Huang Zhao-bo Chen Nan-qi Ren Dong-xue Hu Dong-huan Zheng Zhen-peng Zhang 《浙江大学学报(A卷英文版)》2009,10(11):1642-1650
To improve the working and living environment of submarine crews, an integrated system of CO2 removal and O2 regeneration was designed to work under experimental conditions for 50 people in a submarine cabin during prolonged voyages. The integrated system comprises a solid amine water desorption （SAWD） unit for CO2 collection and concentration, a Sabatier reactor for CO2 reduction and a solid polymer electrolyte （SPE） unit for O2 regeneration by electrolysis. The performances of the SAWD-Sabatier-SPE integrated system were investigated. The experimental results from the SAWD unit showed that the average CO2 concentration in the CO2 storage tank was more than 96% and the outlet CO2 concentration was nearly zero in the first 45 min, and less than 1/10 of inlet CO2 after 60 min when input CO2 was 0.5% （1000 L）. About 950 L of CO2 was recovered with a recovery rate of 92%-97%. The output CO2 concentration was less than 0.2%, which showed that the adsorption-desorption performance of this unit was excellent. In the CO2 reduction unit we investigated mainly the start-up and reaction performance of the Sabatier reactor. The start-up time of the Sabatier reactor was 6, 8 and 10 rain when the start-up temperature was 187.3, 179.5 and 168 ℃, respectively. The product water was colorless, transparent, and had a pH of 6.9-7.5, and an electrical conductivity of 80μs/cm. The sum of the concentration of metal ions （Ru^3＋, Al^3＋, Pb^2＋） was 0.028% and that of nonmetal ions （Cl^-, SO4^2-） was 0.05%. In the O2 regeneration unit, the O2 generation rate was 0.48 m^3/d and the quantity was 2400 L, sufficient to meet the submariners＇ basic oxygen demands. These results may be useful as a basis for establishing CO2-1evel limits and O2 regeneration systems in submarines or similar enclosed compartments during prolonged voyages. 相似文献
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确立了花生籽粒样品中咪唑乙烟酸残留的甲醇涡旋提取、PSA净化的分散固相萃取样品前处理程序,建立并优化了高效液相色谱样品检测方法.结果显示：在确定的色谱条件下,咪唑乙烟酸在0.05~10.0 mg/L质量浓度范围内与对应的色谱峰面积线性响应良好,其回归方程为y=4.0038x-0.2756（R2=0.9995）,方法的检出限（LOD）为0.016 mg/L.咪唑乙烟酸0.05、0.10和0.50 mg/kg 3个添加水平的平均回收率均在85%以上,RSD均小于10%,方法的检测限（LOQ）为0.036 mg/kg.表明所建立残留样品前处理方法和高效液相色谱检测方法简便、经济、快速、灵敏,适于花生中咪唑乙烟酸残留量的检测. 相似文献
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