焚烧炉烟气中铅、锌、苯并(a)芘的测定

建立了用电感耦合等离子体光谱法(ICP-AES)和高效液相色谱法(HPLC)分别测定焚烧炉烟气中铅(Pb)、锌(Zn)和苯并(a)芘(BaP)的分析方法。研究了烟尘及玻璃纤维滤筒的预处理，测定Pb、Zn、BaP时基体的干扰与消除，并给出Pb、Zn的干扰校正系数。实验测得Pb、Zn和BaP的回收率超过84％，相对标准偏差Pb为3．51％，Zn为7．28%，BaP为4．30％。实验结果表明，该分析方法可以满足焚烧炉运行中的监测需要．     

S U S Y 2

This package deals with supersymmetric functions and with the algebra of supersymmetric operators in extended N = 2 as well as in nonextended N = 1 supersymmetry. It allows us to make a realization of the SuSy algebra of differential operators, compute the gradients of given SuSy Hamiltonians and to obtain the SuSy version of soliton equations using the SuSy Lax approach. There are also many additional procedures included that are also encountered in the SuSy soliton approach, as for example the conjugation of a given SuSy operator, the computation of a general form of SuSy Hamiltonians (up to SuSy divergence equivalence), and the checking of the validity of the Jacobi identity for some SuSy Hamiltonian operators.     

改性大豆皮吸附剂对Pb2+的生物吸附性能研究

Using soybean hull residue after the soluble dietary fiber being removed during the soybean processing industry as crude material, a novel absorbent modified soybean hulls is prepared. Its adsorption behavior for Pb2+ is studied. The adsorbent has a large and efficient adsorpuon capacity for Pb-, uv to 20% of the mass of dry adsorbent. Its maximum adsorption capacity for Pb2+ reaches 217 mg.g-1 at initial Pb2+ concentration of 2000 mg.L-1,which is twice that of yeast absorbent and threefold greater than that of chitosan absorbent. The adsorption ability is sensitive to pH value in the solution and the optimal pH for adsorption of Pb2+is 7.0. In the presence of other metal ions (Ca2+, Mg2+and Na+) in the solution, their effect on the adsorption capacity for Pb2+is not obvious. After 5 cycles of adsorption, 80% adsorption capacity of Pb2+ is maintained. Compared with various available commercial resins, the modified soybean hulls are a plentiful, inexpensive and effective medium for the capture of dissolved Pb2+ from waste streams.     

氯化分离——ICP—MS法测定高纯锡中的杂质元素Pb

文章研究了高纯锡分离基体富集杂质元素的方法,及采用ICP—MS测定杂质元素Pb的方法探索。通过氯化分离基体锡和以T1为内标,有效地克服了基体效应干扰。方法的检测限为0．05ng／mL;精密度为0．8％～1．1％;回收率在96％～104％范围之间。本法可满足99．999％以上高纯锡中杂质元素Pb测定的要求。     

力电多场鼓包法测定PZT铁电薄膜的横向压电系数

为表征Pb(Zr_(0.52)Ti_(0.48))O_3(PZT)薄膜的横向压电性能,以纯力场鼓包测试模型和铁电薄膜材料压电方程为基础,推导了PZT铁电薄膜的力电耦合鼓包本构模型。采用溶胶-凝胶法制备了PZT铁电薄膜,并通过化学腐蚀法获得PZT薄膜鼓包样品。在外加电压为0~14V的条件下进行鼓包测试。结果表明,在纯力场作用下,PZT薄膜的弹性模量和残余应力分别为91.9GPa和36.2MPa;随着电压从2V变化到14V,PZT薄膜的横向压电系数d31从-28.9pm/V变化到-45.8pm/V。本工作所发展的力电耦合鼓包测试技术及力电耦合鼓包本构模型为评价铁电薄膜材料的横向压电性能提供了一种有效的分析方法。     

二甲酚橙分光光度法测定化学镀镍液中的铅浓度

化学镀镍液中的镍离子对铅离子浓度测定的干扰较大。先将化学镀镍液中的铅离子与镍离子分离,再用二甲酚橙分光光度法测定镀镍液中铅的浓度。结果显示:当化学镀镍液中镍/铅浓度比120时,可以直接用分光光度法进行测定;当镍/铅浓度比120时,需先将镍离子与铅离子分离,再用分光光度法测定。该方法快速、简捷、误差小,是一种测定化学镀镍液中铅浓度的好方法。     

新型壳聚糖/DNS杂化材料的制备及对重金属Pb2+的吸附性能研究

在乙醚介质中,通过丁二酸酐与γ-氨丙基三甲氧基硅烷改性后的纳米SiO2(即可分散的纳米SiO2,简称DNS)反应,合成了羧基化的DNS,经过壳聚糖与羧基化的DNS脱水生成酰胺的过程,制备了壳聚糖/DNS杂化材料.通过红外光谱、扫描电镜和热重分析对杂化材料进行表征.研究了壳聚糖及杂化材料微粒吸附Pb2+时pH值、时间、用...     

GFAAS法测定LiMn2O4中的Pb和Cd

采用石墨炉原子吸收光谱法(GFAAs)测定锂离子电池正极材料LiMn2O4中杂质Pb和Cd的含量.探讨了HNO2浓度、Pb和Cd的灰化温度和原子化温度、基体改进剂对测定结果的影响.该方法的操作简单,准确度高,Pb的回收率为91.22%～93.75%,Cd的回收率为96.5%～108.6%;精密度好,两种元素测定的相对标准偏差RSD(n=lO)<5%.     

Neurotoxicity of Chronic Co-Exposure of Lead and Ionic Liquid in Common Carp: Synergistic or Antagonistic?

Previous studies have indicated that the harmful heavy metal lead (Pb) contamination in aquatic systems has caused intelligence development disorders and nervous system function abnormalities in juveniles due to the increased permeability of the blood–brain barrier. Ionic liquids (ILs) are considered “green” organic solvents that can replace traditional organic solvents. Studies have found the presence of ILs in soil and water due to chemical applications or unintentional leakage. Therefore, what would happen if Pb interacted with ILs in a body of water? Could ILs enable Pb to more easily cross the blood–brain barrier? Therefore, we examined the combined exposure of Pb and ILs in common carp at low concentration (18.3 mg L⁻¹ of Pb(CH₃COO)₂•3 H₂O and 11 mg L⁻¹ of the IL 1-methyl-3-octylimidazolium chloride, 5% of their LC₅₀) for 28 days in the present study. The result of a neurobehavioral assay showed that chronic exposure of lead at lower concentrations significantly altered fish movement and neurobehaviors, indicating that lead exposure caused neurotoxicity in the carp. Increases in the neurotransmitter dopamine levels and injuries in the fish brain accounted for neurobehavioral abnormalities induced by lead exposure. Moreover, we also found that lead could easily cross the blood–brain barrier and caused significant bioaccumulation in the brain. Particularly, our study indicated that the ionic liquid could not synergistically promote blood–brain barrier permeability and hence failed to increase the absorption of lead in the fish brain, suggesting that the combined exposure of lead and ILs was not a synergistic effect but antagonism to the neurotoxicity. The results of this study suggested that ILs could recede the Pb induced neurotoxicity in fish.