Study on the Preparation of Mercaptoacetic Acid-modified Heterophylla Shell and Its Application in Separation and Enrichment of Pb^2＋ in Environmental Samples

To increase the adsorption capacity of the Corylus heterophylla Fisch（HS） for Pb2＋, HS was chemically modified using NaOH aqueous solution and 95% ethanol and was labeled as SHS; then SHS was chemically modified using mercaptoacetic acid. The SHS modified with mercaptoacetic acid（MHS） was characterized using FTIR, SEM, and XPS. The results indicated that the --SH group was present on MHS, and after Pb2＋ adsorption, the absorption value of the characteristic peak of the --SH group decreased. The adsorption and desorption properties of this func- tionalized material were investigated as well as the influences of parameters, such as pH value, type of desorption reagent, dosage, flow rate and maximum sample volume. The Pb2~ adsorption of MI-IS reached a maximum with pH〉5. The experimental data of Pb2＋ adsorption using MHS were fitted using the Langmuir isothermal adsorption model, and a maximum adsorption capacity of 61.54 mg/g was obtained. This was much higher than the adsorption capacity of SHS before modification with the thiol group. After adsorption, MHS was desorbed using a 0.2 mol/L HC1 solution, and the percent of desorption was higher than 99%. MHS was used as a solid-phase extractant in the analysis and determination of Pb2＋ content in food and water samples, and the enrichment times achieved 150-fold.

平欧杂种榛产业优势及发展现状

平欧杂种榛(Corylus heterophylla Fisch.×C.avellana L.)是我国林业科技工作者利用野生平榛和欧洲榛进行种间杂交选育出的新品种,具有大果、丰产、抗寒等特性。平欧杂种榛既可作为坚果直接食用,又是高端木本油料;既可采摘鲜食,也可加工成榛子乳饮料、榛仁巧克力、点心饼干等多种食品。平欧杂种榛的选育成功,结束了我国榛子没有人工栽培的历史,榛子产业在我国开始起步发展。发展大果榛子要注意品种选择配置,做好规划设计,采用2年生或3年生大苗建园和现代榛园管理技术。平欧杂种榛是新品种、新产业,具有适应性强、省工省力、结果早、产量高、效益好等多种优势,可在我国淮河以北广大区域发展。

平欧杂种榛与黄花乌头间种模式

对比平欧杂种榛(Corylus heterophylla Fisch.×C.avellana L.)幼龄期、盛果期、衰败期与黄花乌头(Aconitum Coreanum)间种效果,衡量标准为:中草药黄花乌头的保苗率、苗高、成品根质量、种子4个指标数值。通过试验比对,黄花乌头在平欧杂种榛幼龄期表现要比盛果期和衰败期好,无论从保存率、苗高、成品根质量和种子的产量都有明显效果。平欧杂种榛间种中草药黄花乌头模式值得推广。