超高效液相色谱-串联质谱法测定纺织品中烷基酚

建立了超高效液相色谱-串联质谱联用法同时快速测定纺织品中2种烷基酚的分析方法。通过实验条件的优化,样品用甲醇在60℃超声提取30 min,萃取液过滤后以C18色谱柱为分离柱,电喷雾负离子模式电离,多重反应监测模式测定,外标法定量。2种烷基酚在0.05～1 mg·L^-1浓度范围内呈现良好的线性关系,相关系数(r²)均大于0.995,方法检出限分别为0.25(OP)和0.34(NP)mg·kg^-1,在3个不同浓度水平进行加标回收试验,平均回收率为81.7%～109.0%,相对标准偏差(n=6)为4.3%～9.2%。方法检出限低,分析时间短,适用于实际纺织品材料中烷基酚的分析检测。     

Effects of electrostatic interactions and geometrical confinements on depletion interactions in charged colloidal system

In a charged colloidal system, the influence on depletion interaction between two like-charged macro-ions is studied through Monte Carlo simulation in this paper. The numerical results show that this depletion force is affected by both the electrostatic interactions between charged spheres and charged plates and by the geometrical factor of the two charged plates, and they further indicate that the influence of geometrical confinement on the depletion interaction is larger than that of electrostatic potential.     

A Monte Carlo Study of Influences on Depletion Force from Another Large Sphere in Colloidal Suspensions

According to the acceptance ratio method, the influences on the depletion interactions between a large sphere and a plate from another closely placed large sphere are studied by Monte Carlo simulation. The numerical results show that both the depletion potential and depletion force are affected by the presence of the closely placed large sphere; the closer the large sphere are placed to them, the larger the influence will be. Furthermore, the influences on the depletion interactions from another large sphere are more sensitive to the angle than to the distance.