2001—2005中国各省(市)燃煤大气铅排放量估算

首次估算了中国各省(市)燃煤大气铅排放量和铅排放强度。结果表明,在2001—2005年,山西、湖北、山东、河北、河南的燃煤铅排量均超过3 000 t,各省(市)共向大气排铅5.9万t,年平均增长速度达14.5%。燃煤大气铅排放强度与儿童铅中毒率之间存在复杂的相关关系,在人口铅排强度低于0.5 t/万人的省(市),两者呈显著负相关关系;而在人口铅排强度超过0.6 t/万人的省(市),两者呈极显著正相关关系。     

传染性单核细胞增多症患儿微量元素分析

为探讨微量元素与传染性单核细胞增多症的关系,对30例传染性单核细胞增多症患儿及30例健康儿童进行了全血6种微量元素检测分析。结果表明,传染性单核细胞增多症患儿的全血锌、铁含量低于健康儿童(P0.05),而血铜、钙、镁、铅等无明显变化。提示传染性单核细胞增多症患儿部分微量元素含量存在异常。     

2003—2007年中国儿童铅中毒率的分析研究——发铅检测结果

通过计算机检索收集了2003—2007年间公开发表的、关于儿童发铅水平和铅中毒率的中文文献,对涉及8省16万人作了调查分析。结果表明,近5年内中国儿童的平均发铅水平为7.5μg/g,铅中毒率平均为27.5%,与同一时期血铅检测结果一致。     

南通市1118例患儿发锌、铅含量与分析

为了解南通市患儿体内微量元素锌、铅含量及其关系,采用火焰原子吸收分光光度法对1 118例发锌、铅进行了检测分析,按性别、年龄做了锌、铅的相关分析。结果表明,缺锌率为77.91%;铅含量均在正常范围内;南通市患儿锌、铅的x-±s分别为(83.6±24.8)、(1.4±0.7)μg/g;低锌和低铅污染无负相关关系。     

三核铁簇硫酸盐K_2(H_3O)_3[Fe_3(H_2O)_3O(SO_4)_6]·6H_2O的合成与晶体结构

在室温条件下合成了含三核铁簇的硫酸盐配合物K2(H3O)3[Fe3(H2O)3O(SO4)6].6 H2O,借助IR光谱、紫外-可见吸收光谱、X射线光电子能谱(XPS)和X射线单晶衍射等测试手段对其结构进行了表征.结果表明,标题化合物属于六方晶系,P6(3)/m空间群,晶胞参数为:a=b=0.963 7(2)nm,c=1.885 1(9)nm,V=1.516 3(9)nm3,Z=2,Dc=2.316 g/cm3,GOOF=1.089,R1=0.062 8,wR2=0.165 1.其分子由1个三核铁簇阴离子[Fe3(H2O)3O(SO4)6]5-、2个K+离子、3个水合质子H3O+和6个结晶水分子组成.     

The mean activity coefficients of LaCl3 in dilute aqueous solution at 298.15 K

The electromotive forces of a symmetrical concentration cell with transference, Ag; AgCl|LaCl₃ (m*):LaCl₃ (m)|AgCl; Ag, were measured over the concentration range from 8.762 × 10⁻⁴ mol kg⁻¹ to 6.788 × 10⁻² mol kg⁻¹ at 298.15 K to obtain the mean activity coefficients of LaCl₃. The mean activity coefficient for reference solution at 298.15 K and the ion size parameter for LaCl₃ in the extended Debye–Hückel equation are evaluated by using an approach extrapolating concentration to unlimited dilution. A modified Debye–Hückel equation with new parameters has been established for the studied concentration range. A comparison is done of the thermodynamic data of LaCl₃ that are determined by this experiment with those reported by previous literatures, and evaluated by some models.     

pePC-SAFT: Modeling of polyelectrolyte systems: 1. Vapor–liquid equilibria

A molecular thermodynamic model for polyelectrolyte systems—called pePC-SAFT—is proposed. The effect of charged monomers within the polyelectrolyte chain is explicitly taken into account in the reference term by replacing the hard-chain contribution of the PC-SAFT model by a charged-hard-chain contribution. Moreover, counterion condensation is accounted for to determine the effective number of charges along the polyion as well as of free counterions. The electrostatic contribution of the free counterions is described by a Debye–Hückel term.     

层状二氧化锰和2,2'-联吡啶铁自组装膜的制备和光电性能研究

采用静电吸附层-层自组装方法制备了层状二氧化锰/2,2'-联吡啶铁自组装膜材料,借助扫描电镜(SEM),紫外可见光谱(UV-Vis)和电化学工作站等测试手段对自组装膜的结构与性能进行了表征.结果表明,该自组装膜具有均匀的表面和紧密的层状结构,在可见光照射条件下该自组装膜电极的氧化还原电流明显增加了.层状二氧化锰/2,2'-联吡啶铁自组装膜电极,在可见光照射条件下光电降解有机染料罗丹明B(1×10-5mol/L)反应80min降解率达到了57%.