NAA对紫背天葵水培扦插枝生根及萌孽的影响

以紫背天葵为材料,研究了不同浓度NAA对其水培条件下扦插枝生根及萌蘖.结果表明,500mgL1NAA能明显促进生根和萌蘖,显著增加根系活力、成活率和发梢率,显著提高发梢叶片中超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性,但对最长根长、梢长、发梢叶片中过氧化物酶(POD)和抗坏血酸氧化酶(APX)则影响不大.     

不同光质及药剂处理对菊花水培插枝生根及生理活性的影响

将菊花茎段分别用NCT、NAA、青霉素、氨苄青霉素处理,在红、蓝、黄、自然光四种不同光质下进行水培,研究不同光质对菊花茎段根的发生及某些生理活性的变化.结果表明,红光下茎段发根比其它光质及药剂均有效:生根早、生根率高、根数最多、最长.而且,红光处理与其它光质处理相比,苗长得壮,叶绿素含量高;从酶活性测定结果来看,蓝光处理NR活性最大.在不同光质下不同的化学药剂处理中,NCT、氨苄青霉素的根壮根白.     

萘乙酸和吲哚丁酸对巴东胡颓子扦插生根的影响

为研究萘乙酸和吲哚丁酸对巴东胡颓子扦插生根的影响,采用河沙为基质,选用IBA、NAA和IBA+NAA(1∶1)分别配成不同浓度溶液,对巴东胡颓子插穗基部浸泡或速蘸后进行扦插,以清水为空白对照(CK),统计分析不同处理对巴东胡颓子插穗生根率、平均根长及根粗的影响。结果表明:慢浸处理中,均以浸泡4 h插穗生根效果最佳;生根时间较对照组提前10~17 d,处理的最佳浓度是NAA为150 mg/L、IBA和NAA+IBA均为200 mg/L;速蘸处理中,以500 mg/L NAA速蘸5 s或以1 000 mg/L IBA速蘸2 s,或以1 000 mg/L NAA+IBA速蘸2 s,生根率达最高,分别为68.3%、68.7%和79.4%,其中以NAA+IBA处理的效果最佳。萘乙酸、吲哚丁酸及其混合液能有效促进巴东胡颓子的扦插生根。     

成都市工业区大气环境污染状况研究

以成都东郊工业区为例,采集气溶胶样品用中子活化分析测定了24种元素的含量,将分析结果与京津地区、广州地区进行比较,并用气溶胶中元素含量的均值做了富集因子分析。结果表明,该区的气溶胶污染与煤炭燃烧等有关。     

NAA对药用植物黄独生长发育和离体保存的影响

以黄独无菌试管苗为材料,采用单因子实验,对NAA对黄独试管苗生长发育和离体保存进行了初步的研究。结果表明：（1）0.5-1mg.L-1NAA可促进黄独的生长发育,2-4mg.L-1NAA则抑制黄独的生长发育;（2）1mg.L-1的NAA对根的数量、茎的长度和叶的数量与大小均有促进作用,但对根粗和茎粗有抑制作用;（3）2-4mg.L-1NAA可促进愈伤组织形成,在2mg.L-1的NAA作用下愈伤组织最大平均直径为2.6cm,多为白色;（4）0.5-1mg.L-1NAA不利于黄独的离体保存,而2-4mg.L-1NAA可提高黄独试管苗离体保存的成活率。     

Characterization of Heavy Metal Air Pollution in Romania Using Moss Biomonitoring,Neutron Activation Analysis,and Atomic Absorption Spectrometry

ABSTRACT

Heavy metal air pollution in Romania was investigated by using passive moss biomonitoring. This study is a component of an international UNECE ICP Vegetation Program – moss survey. A total of 330 samples of Hypnum cupressiforme, Hylocomium splendens, Pleurozium schreberi, and other mosses were collected in Romania in the summer and autumn of 2010. The concentrations of aluminum, cadmium, chromium, copper, iron, lead, nickel, vanadium, and zinc were determined by graphite furnace/flame atomic absorption spectrometry and instrumental neutron activation analysis. The results were statistically processed to obtain spatial distribution maps of factor scores based on elemental concentrations in the moss, together with the spatial distribution maps of heavy metals in moss. The median concentrations of cadmium, 1.20?mg/kg dry weight, and lead, 30.8?mg/kg dry weight, were high compared with other European countries. The results revealed that the atmospheric deposition of these metals is a problem in north and northwest Romania.     

Neutron activation analysis and Mossbauer spectroscopy research on coloring mechanism of Chinese Ru porcelain

The characteristic spectrum and its main wavelength of Ru porcelain glaze are measured by color difference instrument to determine the relations between glaze color and its main wavelength. The content of the 30 coloring elements in Ru porcelain is determined by neutron activation analysis (NAA), which showed that iron is the major coloring element. M?ssbauer spectroscopy analysis shows that the iron element in the glaze exists in the form of structural iron (Fe2+, Fe3+). The quantitative relationship between the main wavelength of glaze in various colors and the relative content of structural iron (Fe2+/Fe3+) is determined. Thus the coloring mechanism of Ru porcelain is investigated entirely.     

Sample preparation methods for subsequent determination of metals and non-metals in crude oil—A review

In this review sample preparation strategies used for crude oil digestion in last ten years are discussed focusing on further metals and non-metals determination. One of the main challenges of proposed methods has been to overcome the difficulty to bring crude oil samples into solution, which should be compatible with analytical techniques used for element determination. On this aspect, this review summarizes the sample preparation methods for metals and non metals determination in crude oil including those based on wet digestion, combustion, emulsification, extraction, sample dilution with organic solvents, among others. Conventional methods related to wet digestion with concentrated acids or combustion are also covered, with special emphasis to closed systems. Trends in sample digestion, such as microwave-assisted digestion using diluted acids combined with high-efficiency decomposition systems are discussed. On the other hand, strategies based on sample dilution in organic solvents and procedures recommended for speciation analysis are reported as well as the use of direct analysis in view of the recent importance for crude oil field. A compilation concerning sample preparation for crude oil provided by official methods as well as certified reference materials available for accuracy evaluation is also presented and discussed.     

Platinum determination by NAA in two road dust matrices

In this work, a method for platinum determination was studied. The method is based on neutron activation analysis coupled with a preirradiation concentration/separation procedure employing a Dowex ion exchange chromatographic column to overcome serious interferences from other elements.Two environmental matrices, Road Dust CW7 and Road Dust CW8, collected and prepared by the Bureau Communautaire de Reference as candidate reference materials, were analysed. Finally, only CW8 was certified as BCR 723. The results were compared with data obtained by other laboratories with various techniques.     

The IRMM – International Measurement Evaluation Programme,IMEP

 The aim of the International Measurement Evaluation Programme (IMEP) is to give an objective picture of the state-of-the-practice (SoP) of chemical measurements in field laboratories by comparing them to a reference range that contains a value that is as traceable to the SI system of measurements (in this case to the Avogadro Constant, one of the best realizations of the mole so far), as can presently be achieved, but which in any case is independent of human or political decision. Thus, a large-scale field test has been made to realize (international) comparability of these measurements by providing them with an independent scientific common basis. In the third measurement round, IMEP-3, ten trace elements, B, Ca, Cd, Cu, Fe, K, Li, Pb, Rb and Zn were measured in a synthetic and in a natural water by about 155 participating laboratories using their routine methods. The (coded) results are graphically reported and compared to certified reference values, established by IRMM and NIST, using isotope specific methods (isotope dilution mass spectrometry and neutron activation analysis), wherever possible. One of these methods (IDMS) has recently been defined as a primary method of measurement by the Consultative Committee on Amount of Substance (Comité Consultatif pour la Quantité de Matière: CCQM) in its founding meeting in April 1995 at BIPM, Paris. Results indicate a spread of more than ±50%, asymmetrically distributed around the reference range, although the declared accuracy was 5–10%. Self-assessment by participants of their analytical capabilities does not show a high correlation between a self-rating ("more experienced" or "less experienced") and actual performance. In the way they have been applied, all methods seem to produce results of approximately the same quality. There is little reduction in the spread of the measurements if the results obtained for one element in the natural water B are divided by the results obtained for the same element in the synthetic water A (which was unknowingly, a reference material). Index entries International measurement evaluation programme (IMEP).