阳离子交换树脂吸附石墨炉原子吸收法测定海水中痕量铜、铅、镉

用阳离子交换树脂吸附石墨炉原子吸收法测定海水中痕量Cu,Pb,Cd。实验选定了最佳的测定条件。结果表明,在弱碱性条件下,Cu,Pb,Cd能同时被阳离子交换树脂定量吸附。方法的相对标准偏差<3﹪,样品加标回收率93﹪～102﹪,检出限分别为Cu 0.06μg/L,Pb 0.06μg/L,Cd 0.005μg/L。本法操作简便、快速、无干扰、无污染,已用于海水中铜、铅、镉的分析,取得了令人满意的结果。     

地下水和土壤中不同形态碘的分离测定

实验选用717强碱型阴离子树脂吸附溶液中的碘离子和碘酸根,用30g/L氯化钠溶液和2.0mol/L硝酸钠溶液先后从树脂上洗脱碘酸根和碘离子,达到不同形态碘分离的目的。洗脱液用碘-淀粉比色法测定碘的含量。方法已用于我国高碘地区地下水和土壤样品中不同形态碘的分析。     

Eichrom Sr树脂用于铀矿浓缩物中铅锶的分离富集研究

铀矿浓缩物的溯源研究在核法证学中具有重要地位,通过测量其中的铅、锶同位素丰度比能为溯源提供部分地理指示信息。对铀矿浓缩物中铅、锶同位素的精准测量主要受制于大量铀与微量铅、锶的分离、富集。本文利用Eichrom Sr树脂对铅、锶的特效吸附性,通过正交试验对影响铅、锶回收率的主要因素(淋洗酸度、流速、体积)进行了优化,确定了最佳淋洗条件;进而利用UTEVA树脂对铀的特效吸附性,与Eichrom Sr树脂联用,实现了铀矿浓缩物中大量铀与微量铅、锶的分离,有效降低了因铅、锶洗脱液中铀含量过高而引起的基体效应。实验结果表明:铅、锶回收率均 90%,铅、锶洗脱液中的铀含量低于500ng,优于文献报道值(48. 8μg)。利用该方法对实际铀矿浓缩物样品进行测量,分析结果显示铅、锶同位素丰度比可以作为铀矿浓缩物的地理溯源判据,为今后建立铀矿浓缩物中铅、锶同位素数据库提供技术支持。     

锚杆抗滑桩受力特性的光弹试验研究

针对锚杆抗滑桩的研究现状,设计了三种不同嵌固深度的锚杆抗滑桩,桩体及嵌固岩体以环氧树脂作为模型材料,进行了光弹试验,来研究嵌固在岩体中锚杆抗滑桩的受力特性。通过观测桩体及嵌固岩体的等差线条纹变化规律,以及测试锚杆拉力的变化,定性得出了抗滑桩桩体内力的分布规律、桩体的应力集中问题及出现位置和锚杆拉力的变化与桩体嵌固深度的关系等问题,这与普通抗滑桩的受力特性有很大不同。     

Strengthening and rehabilitation of RC beam–column joints using carbon‐FRP jacketing and epoxy resin injection

The scope of this study is to present results of an experimental investigation on the behaviour of critical external beam–column joints repaired or/and strengthened with a combination of epoxy resin injections and carbon‐fibre‐reinforced plastics (C‐FRP) sheets and to extract useful and practical conclusions. The experimental program comprises 12 external beam–column joint connection subassemblages tested in cyclic loading. From the observed responses of the examined specimens it can be deduced that the technique of epoxy resin injections is appropriate for the total rehabilitation of the joints seismic capacity, since no damages have been observed at the joint area of the specimens after the repair. The combination of this technique with the use of C‐FRP sheets leads to a significant improvement of the loading capacity, the energy absorption and the ductility and finally it leads to improved type of damages compared with the damage modes of the specimens during the initial loading. Shortcomings of the application of C‐FRP sheets for practical use are also pointed out. Copyright © 2008 John Wiley & Sons, Ltd.     

化学抗旱剂在烤烟生产上的应用试验

1994～1995年,靖西县新圩乡引进化学抗旱剂——高吸水树脂、农一清应用于烤烟栽培,并进行田间对比试验示范。结果表明：高吸水树脂、农一清具有提高烤烟根系土壤的保水、保肥能力,促进烤烟正常生长的特性。试验期间虽受干旱天气影响,但均普遍表现增产增质     

Erosion control for mudstone soil with ventilation and watertight resin

To accelerate the re-vegetation of exposed landslide areas, hydroseeding for soil and water conservation has been widely applied as one of the economically feasible ways. However, effect durations of different hydroseeding materials are different, the formulation density has a certain effect on plant growth and the addictives may exude. This paper presents laboratory experiments of soil erosion, exuding water quality and soil hardness by using a rainfall simulator with different conditions of slope, rainfall intensity and medication density. The results showed that soil erosion decreased significantly, suggesting a good erosion-resisting effect by the ventilation and watertight resin. No significant variation of the exuded water was observed during testing, which indicates that after gelling, the ventilation and watertight resin are unlikely to release chemical substances. It was found that high resin density will result in poor workability as well as high costs; adverse will cause the mudstone to fracture due to raindrops since cracks are common to soil surface. The weatherability after spraying and its effect on plant vegetation still need further investigation.     

大孔强酸型树脂吸附烟碱的研究──烟气中尼古丁含量的测定

研究了硫酸溶液中Ｄ００１Ｂ大孔强酸型树脂对烟碱的吸附性能。实验结果显示，介质在ｐＨ为２时，树脂对烟碱有最佳吸附，最大静态吸附量为３００ｍｇＮｉｃｏｔｉｎ／ｇＲｅｓｉｎ；Ｆｅ３＋、Ｃｕ２＋、Ｃａ２＋、Ｎａ＋分别在其浓度为烟碱浓度的２．５、５．０、１０、１００倍以下对烟碱的吸附干扰较小；烟碱负载柱可用５％ＮａＯＨ洗脱，洗脱率达９９．６％。另外，通过对金丝猴、大前门二个牌号香烟的烟丝及烟丝燃烧后烟气中Ｎｉｃｏｔｉｎ含量的分析，确证吸烟有害健康。     

D_（001）树脂在酸性硫脲溶液中吸附、分离金银研究

本文研究了Ｄ_００１大孔阳离子强酸树脂从Ｈ_２ＳＯ_４－ＣＳ（ＮＨ_２）_２溶液中，富集及分离Ａｕ（Ｉ）、Ａｇ（Ｉ）的性能。表明在ｐＨ＝２．０左右，树脂对Ａｕ（Ｔｕ）￣＋_２、Ａｇ（Ｔｕ）￣＋_２（Ｔｕ＝硫脲）有良好的吸附性能，Ａｕ和Ａｇ的吸附容量分别为６１．１８ｍｇ／ｇ－Ｒｅｓｉｎ和９９．１１ｍｇ／ｇ—Ｒｅｓｉｎ。负载柱上的Ａｕ、Ａｇ可分别用ＮａＣＮ—ＮａＯＨ和Ｈ_３ＢＯ_３－ＮａＯＨ－Ｎａ_２Ｓ_２Ｏ_３定量洗脱。可进行一定程度的Ａｕ、Ａｇ分离。