气相色谱-串联质谱法测定纸制品中杀菌剂、增塑剂、拟除虫菊酯和有机氯农药残留

应用气相色谱-串联质谱法测定纸制品中杀菌剂、增塑剂、拟除虫菊酯和有机氯农药残留。试样以正己烷-丙酮(体积比1∶1)为萃取溶剂,超声辅助萃取过滤后,采用多反应监测(MRM)模式进行测定。在质量浓度0.5~20μg/L范围内,57种目标物线性关系良好,线性相关系数大于0.990。方法检出限为0.004~0.429μg/L。样品加标回收率为73.5%~101.1%,测定结果的相对标准偏差小于10%(n=6)。该方法选择性好,灵敏度高,能满足多种纸制品中杀菌剂、增塑剂、拟除虫菊酯和有机氯农药含量的快速筛查需要。

ICP-MS法快速筛查婴童用品中有机锡的迁移量

本文选择不同种类的婴童用品材料,经萃取液接触提取后,采用电感耦合等离子体质谱仪(ICP-MS)分析萃取液中总锡的含量,对有机锡进行初筛测试。结果表明,锡的浓度在0~1000μg/L范围内与信号强度有良好的线性关系,线性方程为Y=444.16X+2.496,相关系数(r2)为0.9998。检出限为0.22μg/L,定量限为0.74μg/L,有机锡的转化率为81.1%~94.5%,测定值的相对标准偏差(n=7)为2.52%~4.92%,加标回收率为83.9%~91.8%,并与气相色谱-质谱(GC-MS)进行比对验证,满足有机锡快速筛查的要求。

Working Pressure Induced Microstructure and Stress Evolution of Sputtered ZrN Coatings

The influence of working pressure on microstructure and residual stress evolution of magnetron sputtered ZrN coatings were systemically investigated.XPS and XRD results reveal that all as-deposited coatings at varying working pressure are stoichiometric ZrN with cubic NaCl structure.A decrease in working pressure results in preferred orientation evolution from(111)to(200).This evolution is driven by kinetics processes,such as adatom surface migration and competitive grain growth,rather than by thermodynamic.This explanation is also supported by morphology characterization as the surface and cross-section morphologies transition from tapered shape and columnar structure to round and non-columnar(equiaxed)structure.