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491.
螯合树脂富集——原子荧光法测定地面水中的痕量汞 总被引:2,自引:0,他引:2
经对数种不同功能团螯合树脂的研究,优选出了对尔吸附效率高,解脱速度快的H-1S8型螯合树脂,并对树脂装填柱的形态及体积大小进行了研究。经脂交换与洗脱条件及原子荧光谱测试条件进行了优化实验。实验结果,方法的检出限为0.002μg/L,测定地面水水样汞的平均浓度为0.009μg/L;精密度实验的相对标准偏差为5.5%,回收率为96-101% 相似文献
492.
Frank Clark Dr Jan E. Dickinson Barry N. J. Walters Lorraine R. Marshall Peter C. O'Leary 《黑龙江环境通报》1995,15(11):1035-1039
An association is described between women with lupus anticoagulant and abnormal prenatal serum screening results. Three cases of positive second-trimester serum screening for Down syndrome, with karyotypically normal fetuses, in women demonstrated to have lupus anticoagulant are presented. Serum screening positivity was principally due to a disproportionately elevated maternal serum human chorionic gonadotrophin (hCG) level. In each case, early, severe intrauterine growth restriction was documented, with only one fetus surviving the neonatal period. As maternal lupus anticoagulant may have a profoundly adverse effect on the course of pregnancy, we suggest that an elevated hCG level on prenatal screening prompt consideration of maternal lupus anticoagulant testing if ultrasonography demonstrates an otherwise normal singleton gestation and the fetal karyotype is normal. 相似文献
493.
简要介绍了应用于大直径棒料下料的等重下料技术 ,该项技术系现代光电传感技术及计算机控制技术在传统技术领域的应用。在弹体毛坯生产线上 ,首次实现了实时、快速、准确的全自动在线下料检测和控制 ,取代了原有人工下料过程。该项技术在其它制造加工领域也具有广阔的应用前景 ,对提高劳动生产率 ,节约原材料具有重要的经济意义。 相似文献
494.
495.
Summary Frontal gland secretions of termite soldiers of the speciesNasutitermes costalis, N. ephratae, N. nigriceps, N. rippertii, andN. hubbardii were analyzed. The chiral compositions of the monoterpene hydrocarbons were investigated by means of two-dimensional gas chromatography. Two of them, 3-carene and-pinene were present in the form of (–)-enantiomers of high purity in the majority of the samples. The other monoterpenes,-pinene, camphene, sabinene, limonene, and-phellandrene, exhibited a great variation in the enantiopurity between different species.-Pinene and limonene varied significantly even between different colonies within the species.N. costalis was the only species with an invariable composition of the secretion, independent of the locality or origin. 相似文献
496.
Frans J. Los MD Adriana M. Hagenaars Jan Marrink Titia E. Cohen-Overbeek Johannes L. J. Gaillard Helen Brandenburg 《黑龙江环境通报》1992,12(4):285-292
Early second-trimester oligohydramnios was associated with normal maternal serum alpha-fetoprotein (MSAFP) levels in nine out of 26 cases (35 per cent). Congenital malformations of the fetal urinary tract resulting in fetal anuria were present in nine cases; in seven of them, normal MSAFP levels were measured. In contrast, normal MSAFP levels were established in only 2 out of the 17 cases without fetal malformations. These data suggest that fetal urine is the major source of elevated AFP in the maternal compartment in early second-trimester oligohydramnios. This is further supported by the lack of any relationship between concentrations of MSAFP non-reactive with Concanavalin A, originating mainly from the yolk sacderived amniotic fluid AFP pool, and the presence of fetal diuresis. Three out of 26 women had experienced early second-trimester oligohydramnios in a previous pregnancy, suggesting the existence of a recurrence risk for this condition. 相似文献
497.
Prediction of complete bioremediation periods for PAH soil pollutants in different physical states by mechanistic models 总被引:7,自引:0,他引:7
Mass-transfer models and biodegradation models were developed for three theoretical physical states of polycyclic aromatic hydrocarbons (PAHs) in soil. These mechanistic models were used to calculate the treatment periods necessary for complete removal of the PAH pollutants from the soil under batch conditions. Results indicate that the bioremediation of PAHs in such systems is mainly mass-transfer limited. The potential for bioremediation as a treatment technique for PAH contaminated soils is therefore mainly determined by the mass-transfer dynamics of PAHs. Under mass-transfer limited conditions simplified mathematical models, based on the assumption of a zero dissolved PAH concentrations, can be used to predict the period of time needed for complete bioremediation. 相似文献
498.
Jan Ahlers Andreas Gies und J?rn Wogram 《Umweltwissenschaften und Schadstoff-Forschung》2004,16(4):217-218
Ohne Zusammenfassung 相似文献
499.
Ester van der Voet Reinout Heijungs Paul Mulder Ruben Huele René Kleijn Lauran van Oers 《Environmental science and pollution research international》1995,2(3):137-144
In the tradition of the study of materials flows through society, the Substance Flow Analysis (SFA) method and its software tool SFINX are presented. SFA aims at providing the relevant information for a country’s overall management strategy regarding single substances or coherent groups of substances. Three modelling techniques and their possibilities and limitations are discussed: Bookkeeping, static modelling, and dynamic modelling. The computer program SFINX can be used for varoius purposes: (1) to obtain an overview of stocks and flows of a substance in, out and through a nation’s economy and environment for a specific year, (2) to trace the origins of specific pollution problems, and (3) to estimate the effectiveness of certain abatement measures. Each application has its own requirements with regard to data and modelling. 相似文献
500.
Ester van der Voet René Kleijn Lauran van Oers Reinout Heijungs Ruben Huele Paul Mulder 《Environmental science and pollution research international》1997,4(2):112-112
Part I: Abstract In the tradition of the study of materials flows through society, the Substance Flow Analysis (SFA) method is presented. SFA
aims at providing the relevant information for a country’s overall management strategy regarding single substances or coherent
groups of substances. This article is dedicated to the presentation of a threestep general framework for SFA-type studies,
and elaborates on its first step the systems definition. Attention is given to the definition of the external and internal
system boundaries, the categorization of the system’s elements, aspects of materials choice, time, and space, and how these
depend on the aim of the conducted study. Moreover, a broader discussion is started on the need for standardization of materials
flow studies in general.
Part II: Abstract In the tradition of the study of materials flows through society, the Substance Flow Analysis (SFA) method and its software
tool SFINX are presented. SFA aims at providing the relevant information for a country’s overall management strategy regarding
single substances or coherent groups of substances. Three modelling techniques and their possibilities and limitations are
discussed: Bookkeeping, static modelling, and dynamic modelling. The computer program SFINX can be used for varoius purposes:
(1) to obtain an overview of stocks and flows of a substance in, out and through a nation’s economy and environment for a
specific year, (2) to trace the origins of specific pollution problems, and (3) to estimate the effectiveness of certain abatement
measures. Each application has its own requirements with regard to data and modelling. 相似文献